1741 lines
49 KiB
C
1741 lines
49 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* ZynqMP DisplayPort Driver
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*
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* Copyright (C) 2017 - 2020 Xilinx, Inc.
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*
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* Authors:
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* - Hyun Woo Kwon <hyun.kwon@xilinx.com>
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* - Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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*/
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#include <drm/drm_atomic_helper.h>
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#include <drm/drm_connector.h>
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#include <drm/drm_crtc.h>
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#include <drm/drm_device.h>
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#include <drm/drm_dp_helper.h>
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#include <drm/drm_edid.h>
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#include <drm/drm_encoder.h>
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#include <drm/drm_managed.h>
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#include <drm/drm_modes.h>
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#include <drm/drm_of.h>
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#include <drm/drm_probe_helper.h>
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#include <drm/drm_simple_kms_helper.h>
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/pm_runtime.h>
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#include <linux/phy/phy.h>
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#include <linux/reset.h>
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#include "zynqmp_disp.h"
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#include "zynqmp_dp.h"
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#include "zynqmp_dpsub.h"
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static uint zynqmp_dp_aux_timeout_ms = 50;
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module_param_named(aux_timeout_ms, zynqmp_dp_aux_timeout_ms, uint, 0444);
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MODULE_PARM_DESC(aux_timeout_ms, "DP aux timeout value in msec (default: 50)");
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/*
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* Some sink requires a delay after power on request
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*/
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static uint zynqmp_dp_power_on_delay_ms = 4;
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module_param_named(power_on_delay_ms, zynqmp_dp_power_on_delay_ms, uint, 0444);
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MODULE_PARM_DESC(power_on_delay_ms, "DP power on delay in msec (default: 4)");
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/* Link configuration registers */
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#define ZYNQMP_DP_LINK_BW_SET 0x0
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#define ZYNQMP_DP_LANE_COUNT_SET 0x4
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#define ZYNQMP_DP_ENHANCED_FRAME_EN 0x8
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#define ZYNQMP_DP_TRAINING_PATTERN_SET 0xc
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#define ZYNQMP_DP_SCRAMBLING_DISABLE 0x14
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#define ZYNQMP_DP_DOWNSPREAD_CTL 0x18
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#define ZYNQMP_DP_SOFTWARE_RESET 0x1c
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#define ZYNQMP_DP_SOFTWARE_RESET_STREAM1 BIT(0)
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#define ZYNQMP_DP_SOFTWARE_RESET_STREAM2 BIT(1)
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#define ZYNQMP_DP_SOFTWARE_RESET_STREAM3 BIT(2)
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#define ZYNQMP_DP_SOFTWARE_RESET_STREAM4 BIT(3)
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#define ZYNQMP_DP_SOFTWARE_RESET_AUX BIT(7)
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#define ZYNQMP_DP_SOFTWARE_RESET_ALL (ZYNQMP_DP_SOFTWARE_RESET_STREAM1 | \
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ZYNQMP_DP_SOFTWARE_RESET_STREAM2 | \
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ZYNQMP_DP_SOFTWARE_RESET_STREAM3 | \
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ZYNQMP_DP_SOFTWARE_RESET_STREAM4 | \
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ZYNQMP_DP_SOFTWARE_RESET_AUX)
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/* Core enable registers */
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#define ZYNQMP_DP_TRANSMITTER_ENABLE 0x80
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#define ZYNQMP_DP_MAIN_STREAM_ENABLE 0x84
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#define ZYNQMP_DP_FORCE_SCRAMBLER_RESET 0xc0
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#define ZYNQMP_DP_VERSION 0xf8
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#define ZYNQMP_DP_VERSION_MAJOR_MASK GENMASK(31, 24)
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#define ZYNQMP_DP_VERSION_MAJOR_SHIFT 24
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#define ZYNQMP_DP_VERSION_MINOR_MASK GENMASK(23, 16)
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#define ZYNQMP_DP_VERSION_MINOR_SHIFT 16
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#define ZYNQMP_DP_VERSION_REVISION_MASK GENMASK(15, 12)
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#define ZYNQMP_DP_VERSION_REVISION_SHIFT 12
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#define ZYNQMP_DP_VERSION_PATCH_MASK GENMASK(11, 8)
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#define ZYNQMP_DP_VERSION_PATCH_SHIFT 8
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#define ZYNQMP_DP_VERSION_INTERNAL_MASK GENMASK(7, 0)
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#define ZYNQMP_DP_VERSION_INTERNAL_SHIFT 0
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/* Core ID registers */
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#define ZYNQMP_DP_CORE_ID 0xfc
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#define ZYNQMP_DP_CORE_ID_MAJOR_MASK GENMASK(31, 24)
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#define ZYNQMP_DP_CORE_ID_MAJOR_SHIFT 24
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#define ZYNQMP_DP_CORE_ID_MINOR_MASK GENMASK(23, 16)
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#define ZYNQMP_DP_CORE_ID_MINOR_SHIFT 16
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#define ZYNQMP_DP_CORE_ID_REVISION_MASK GENMASK(15, 8)
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#define ZYNQMP_DP_CORE_ID_REVISION_SHIFT 8
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#define ZYNQMP_DP_CORE_ID_DIRECTION GENMASK(1)
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/* AUX channel interface registers */
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#define ZYNQMP_DP_AUX_COMMAND 0x100
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#define ZYNQMP_DP_AUX_COMMAND_CMD_SHIFT 8
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#define ZYNQMP_DP_AUX_COMMAND_ADDRESS_ONLY BIT(12)
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#define ZYNQMP_DP_AUX_COMMAND_BYTES_SHIFT 0
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#define ZYNQMP_DP_AUX_WRITE_FIFO 0x104
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#define ZYNQMP_DP_AUX_ADDRESS 0x108
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#define ZYNQMP_DP_AUX_CLK_DIVIDER 0x10c
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#define ZYNQMP_DP_AUX_CLK_DIVIDER_AUX_FILTER_SHIFT 8
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#define ZYNQMP_DP_INTERRUPT_SIGNAL_STATE 0x130
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#define ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_HPD BIT(0)
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#define ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REQUEST BIT(1)
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#define ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY BIT(2)
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#define ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY_TIMEOUT BIT(3)
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#define ZYNQMP_DP_AUX_REPLY_DATA 0x134
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#define ZYNQMP_DP_AUX_REPLY_CODE 0x138
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#define ZYNQMP_DP_AUX_REPLY_CODE_AUX_ACK (0)
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#define ZYNQMP_DP_AUX_REPLY_CODE_AUX_NACK BIT(0)
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#define ZYNQMP_DP_AUX_REPLY_CODE_AUX_DEFER BIT(1)
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#define ZYNQMP_DP_AUX_REPLY_CODE_I2C_ACK (0)
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#define ZYNQMP_DP_AUX_REPLY_CODE_I2C_NACK BIT(2)
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#define ZYNQMP_DP_AUX_REPLY_CODE_I2C_DEFER BIT(3)
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#define ZYNQMP_DP_AUX_REPLY_COUNT 0x13c
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#define ZYNQMP_DP_REPLY_DATA_COUNT 0x148
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#define ZYNQMP_DP_REPLY_DATA_COUNT_MASK 0xff
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#define ZYNQMP_DP_INT_STATUS 0x3a0
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#define ZYNQMP_DP_INT_MASK 0x3a4
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#define ZYNQMP_DP_INT_EN 0x3a8
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#define ZYNQMP_DP_INT_DS 0x3ac
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#define ZYNQMP_DP_INT_HPD_IRQ BIT(0)
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#define ZYNQMP_DP_INT_HPD_EVENT BIT(1)
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#define ZYNQMP_DP_INT_REPLY_RECEIVED BIT(2)
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#define ZYNQMP_DP_INT_REPLY_TIMEOUT BIT(3)
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#define ZYNQMP_DP_INT_HPD_PULSE_DET BIT(4)
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#define ZYNQMP_DP_INT_EXT_PKT_TXD BIT(5)
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#define ZYNQMP_DP_INT_LIV_ABUF_UNDRFLW BIT(12)
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#define ZYNQMP_DP_INT_VBLANK_START BIT(13)
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#define ZYNQMP_DP_INT_PIXEL1_MATCH BIT(14)
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#define ZYNQMP_DP_INT_PIXEL0_MATCH BIT(15)
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#define ZYNQMP_DP_INT_CHBUF_UNDERFLW_MASK 0x3f0000
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#define ZYNQMP_DP_INT_CHBUF_OVERFLW_MASK 0xfc00000
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#define ZYNQMP_DP_INT_CUST_TS_2 BIT(28)
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#define ZYNQMP_DP_INT_CUST_TS BIT(29)
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#define ZYNQMP_DP_INT_EXT_VSYNC_TS BIT(30)
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#define ZYNQMP_DP_INT_VSYNC_TS BIT(31)
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#define ZYNQMP_DP_INT_ALL (ZYNQMP_DP_INT_HPD_IRQ | \
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ZYNQMP_DP_INT_HPD_EVENT | \
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ZYNQMP_DP_INT_CHBUF_UNDERFLW_MASK | \
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ZYNQMP_DP_INT_CHBUF_OVERFLW_MASK)
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/* Main stream attribute registers */
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#define ZYNQMP_DP_MAIN_STREAM_HTOTAL 0x180
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#define ZYNQMP_DP_MAIN_STREAM_VTOTAL 0x184
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#define ZYNQMP_DP_MAIN_STREAM_POLARITY 0x188
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#define ZYNQMP_DP_MAIN_STREAM_POLARITY_HSYNC_SHIFT 0
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#define ZYNQMP_DP_MAIN_STREAM_POLARITY_VSYNC_SHIFT 1
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#define ZYNQMP_DP_MAIN_STREAM_HSWIDTH 0x18c
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#define ZYNQMP_DP_MAIN_STREAM_VSWIDTH 0x190
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#define ZYNQMP_DP_MAIN_STREAM_HRES 0x194
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#define ZYNQMP_DP_MAIN_STREAM_VRES 0x198
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#define ZYNQMP_DP_MAIN_STREAM_HSTART 0x19c
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#define ZYNQMP_DP_MAIN_STREAM_VSTART 0x1a0
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#define ZYNQMP_DP_MAIN_STREAM_MISC0 0x1a4
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#define ZYNQMP_DP_MAIN_STREAM_MISC0_SYNC_LOCK BIT(0)
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#define ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_RGB (0 << 1)
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#define ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_YCRCB_422 (5 << 1)
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#define ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_YCRCB_444 (6 << 1)
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#define ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_MASK (7 << 1)
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#define ZYNQMP_DP_MAIN_STREAM_MISC0_DYNAMIC_RANGE BIT(3)
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#define ZYNQMP_DP_MAIN_STREAM_MISC0_YCBCR_COLR BIT(4)
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#define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_6 (0 << 5)
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#define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_8 (1 << 5)
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#define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_10 (2 << 5)
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#define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_12 (3 << 5)
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#define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_16 (4 << 5)
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#define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_MASK (7 << 5)
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#define ZYNQMP_DP_MAIN_STREAM_MISC1 0x1a8
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#define ZYNQMP_DP_MAIN_STREAM_MISC1_Y_ONLY_EN BIT(7)
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#define ZYNQMP_DP_MAIN_STREAM_M_VID 0x1ac
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#define ZYNQMP_DP_MSA_TRANSFER_UNIT_SIZE 0x1b0
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#define ZYNQMP_DP_MSA_TRANSFER_UNIT_SIZE_TU_SIZE_DEF 64
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#define ZYNQMP_DP_MAIN_STREAM_N_VID 0x1b4
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#define ZYNQMP_DP_USER_PIX_WIDTH 0x1b8
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#define ZYNQMP_DP_USER_DATA_COUNT_PER_LANE 0x1bc
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#define ZYNQMP_DP_MIN_BYTES_PER_TU 0x1c4
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#define ZYNQMP_DP_FRAC_BYTES_PER_TU 0x1c8
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#define ZYNQMP_DP_INIT_WAIT 0x1cc
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/* PHY configuration and status registers */
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#define ZYNQMP_DP_PHY_RESET 0x200
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#define ZYNQMP_DP_PHY_RESET_PHY_RESET BIT(0)
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#define ZYNQMP_DP_PHY_RESET_GTTX_RESET BIT(1)
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#define ZYNQMP_DP_PHY_RESET_PHY_PMA_RESET BIT(8)
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#define ZYNQMP_DP_PHY_RESET_PHY_PCS_RESET BIT(9)
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#define ZYNQMP_DP_PHY_RESET_ALL_RESET (ZYNQMP_DP_PHY_RESET_PHY_RESET | \
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ZYNQMP_DP_PHY_RESET_GTTX_RESET | \
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ZYNQMP_DP_PHY_RESET_PHY_PMA_RESET | \
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ZYNQMP_DP_PHY_RESET_PHY_PCS_RESET)
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#define ZYNQMP_DP_PHY_PREEMPHASIS_LANE_0 0x210
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#define ZYNQMP_DP_PHY_PREEMPHASIS_LANE_1 0x214
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#define ZYNQMP_DP_PHY_PREEMPHASIS_LANE_2 0x218
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#define ZYNQMP_DP_PHY_PREEMPHASIS_LANE_3 0x21c
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#define ZYNQMP_DP_PHY_VOLTAGE_DIFF_LANE_0 0x220
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#define ZYNQMP_DP_PHY_VOLTAGE_DIFF_LANE_1 0x224
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#define ZYNQMP_DP_PHY_VOLTAGE_DIFF_LANE_2 0x228
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#define ZYNQMP_DP_PHY_VOLTAGE_DIFF_LANE_3 0x22c
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#define ZYNQMP_DP_PHY_CLOCK_SELECT 0x234
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#define ZYNQMP_DP_PHY_CLOCK_SELECT_1_62G 0x1
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#define ZYNQMP_DP_PHY_CLOCK_SELECT_2_70G 0x3
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#define ZYNQMP_DP_PHY_CLOCK_SELECT_5_40G 0x5
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#define ZYNQMP_DP_TX_PHY_POWER_DOWN 0x238
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#define ZYNQMP_DP_TX_PHY_POWER_DOWN_LANE_0 BIT(0)
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#define ZYNQMP_DP_TX_PHY_POWER_DOWN_LANE_1 BIT(1)
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#define ZYNQMP_DP_TX_PHY_POWER_DOWN_LANE_2 BIT(2)
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#define ZYNQMP_DP_TX_PHY_POWER_DOWN_LANE_3 BIT(3)
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#define ZYNQMP_DP_TX_PHY_POWER_DOWN_ALL 0xf
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#define ZYNQMP_DP_PHY_PRECURSOR_LANE_0 0x23c
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#define ZYNQMP_DP_PHY_PRECURSOR_LANE_1 0x240
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#define ZYNQMP_DP_PHY_PRECURSOR_LANE_2 0x244
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#define ZYNQMP_DP_PHY_PRECURSOR_LANE_3 0x248
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#define ZYNQMP_DP_PHY_POSTCURSOR_LANE_0 0x24c
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#define ZYNQMP_DP_PHY_POSTCURSOR_LANE_1 0x250
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#define ZYNQMP_DP_PHY_POSTCURSOR_LANE_2 0x254
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#define ZYNQMP_DP_PHY_POSTCURSOR_LANE_3 0x258
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#define ZYNQMP_DP_SUB_TX_PHY_PRECURSOR_LANE_0 0x24c
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#define ZYNQMP_DP_SUB_TX_PHY_PRECURSOR_LANE_1 0x250
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#define ZYNQMP_DP_PHY_STATUS 0x280
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#define ZYNQMP_DP_PHY_STATUS_PLL_LOCKED_SHIFT 4
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#define ZYNQMP_DP_PHY_STATUS_FPGA_PLL_LOCKED BIT(6)
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/* Audio registers */
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#define ZYNQMP_DP_TX_AUDIO_CONTROL 0x300
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#define ZYNQMP_DP_TX_AUDIO_CHANNELS 0x304
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#define ZYNQMP_DP_TX_AUDIO_INFO_DATA 0x308
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#define ZYNQMP_DP_TX_M_AUD 0x328
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#define ZYNQMP_DP_TX_N_AUD 0x32c
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#define ZYNQMP_DP_TX_AUDIO_EXT_DATA 0x330
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#define ZYNQMP_DP_MAX_LANES 2
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#define ZYNQMP_MAX_FREQ 3000000
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#define DP_REDUCED_BIT_RATE 162000
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#define DP_HIGH_BIT_RATE 270000
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#define DP_HIGH_BIT_RATE2 540000
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#define DP_MAX_TRAINING_TRIES 5
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#define DP_V1_2 0x12
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/**
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* struct zynqmp_dp_link_config - Common link config between source and sink
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* @max_rate: maximum link rate
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* @max_lanes: maximum number of lanes
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*/
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struct zynqmp_dp_link_config {
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int max_rate;
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u8 max_lanes;
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};
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/**
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* struct zynqmp_dp_mode - Configured mode of DisplayPort
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* @bw_code: code for bandwidth(link rate)
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* @lane_cnt: number of lanes
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* @pclock: pixel clock frequency of current mode
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* @fmt: format identifier string
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*/
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struct zynqmp_dp_mode {
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u8 bw_code;
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u8 lane_cnt;
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int pclock;
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const char *fmt;
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};
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/**
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* struct zynqmp_dp_config - Configuration of DisplayPort from DTS
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* @misc0: misc0 configuration (per DP v1.2 spec)
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* @misc1: misc1 configuration (per DP v1.2 spec)
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* @bpp: bits per pixel
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*/
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struct zynqmp_dp_config {
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u8 misc0;
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u8 misc1;
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u8 bpp;
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};
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/**
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* struct zynqmp_dp - Xilinx DisplayPort core
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* @encoder: the drm encoder structure
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* @connector: the drm connector structure
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* @dev: device structure
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* @dpsub: Display subsystem
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* @drm: DRM core
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* @iomem: device I/O memory for register access
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* @reset: reset controller
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* @irq: irq
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* @config: IP core configuration from DTS
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* @aux: aux channel
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* @phy: PHY handles for DP lanes
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* @num_lanes: number of enabled phy lanes
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* @hpd_work: hot plug detection worker
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* @status: connection status
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* @enabled: flag to indicate if the device is enabled
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* @dpcd: DP configuration data from currently connected sink device
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* @link_config: common link configuration between IP core and sink device
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* @mode: current mode between IP core and sink device
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* @train_set: set of training data
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*/
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struct zynqmp_dp {
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struct drm_encoder encoder;
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struct drm_connector connector;
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struct device *dev;
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struct zynqmp_dpsub *dpsub;
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struct drm_device *drm;
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void __iomem *iomem;
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struct reset_control *reset;
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int irq;
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struct zynqmp_dp_config config;
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struct drm_dp_aux aux;
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struct phy *phy[ZYNQMP_DP_MAX_LANES];
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u8 num_lanes;
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struct delayed_work hpd_work;
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enum drm_connector_status status;
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bool enabled;
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u8 dpcd[DP_RECEIVER_CAP_SIZE];
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struct zynqmp_dp_link_config link_config;
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struct zynqmp_dp_mode mode;
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u8 train_set[ZYNQMP_DP_MAX_LANES];
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};
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static inline struct zynqmp_dp *encoder_to_dp(struct drm_encoder *encoder)
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{
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return container_of(encoder, struct zynqmp_dp, encoder);
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}
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static inline struct zynqmp_dp *connector_to_dp(struct drm_connector *connector)
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{
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return container_of(connector, struct zynqmp_dp, connector);
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}
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static void zynqmp_dp_write(struct zynqmp_dp *dp, int offset, u32 val)
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{
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writel(val, dp->iomem + offset);
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}
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static u32 zynqmp_dp_read(struct zynqmp_dp *dp, int offset)
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{
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return readl(dp->iomem + offset);
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}
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static void zynqmp_dp_clr(struct zynqmp_dp *dp, int offset, u32 clr)
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{
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zynqmp_dp_write(dp, offset, zynqmp_dp_read(dp, offset) & ~clr);
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}
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static void zynqmp_dp_set(struct zynqmp_dp *dp, int offset, u32 set)
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{
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zynqmp_dp_write(dp, offset, zynqmp_dp_read(dp, offset) | set);
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}
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/* -----------------------------------------------------------------------------
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* PHY Handling
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*/
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#define RST_TIMEOUT_MS 1000
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static int zynqmp_dp_reset(struct zynqmp_dp *dp, bool assert)
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{
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unsigned long timeout;
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if (assert)
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reset_control_assert(dp->reset);
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else
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reset_control_deassert(dp->reset);
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/* Wait for the (de)assert to complete. */
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timeout = jiffies + msecs_to_jiffies(RST_TIMEOUT_MS);
|
|
while (!time_after_eq(jiffies, timeout)) {
|
|
bool status = !!reset_control_status(dp->reset);
|
|
|
|
if (assert == status)
|
|
return 0;
|
|
|
|
cpu_relax();
|
|
}
|
|
|
|
dev_err(dp->dev, "reset %s timeout\n", assert ? "assert" : "deassert");
|
|
return -ETIMEDOUT;
|
|
}
|
|
|
|
/**
|
|
* zynqmp_dp_phy_init - Initialize the phy
|
|
* @dp: DisplayPort IP core structure
|
|
*
|
|
* Initialize the phy.
|
|
*
|
|
* Return: 0 if the phy instances are initialized correctly, or the error code
|
|
* returned from the callee functions.
|
|
*/
|
|
static int zynqmp_dp_phy_init(struct zynqmp_dp *dp)
|
|
{
|
|
int ret;
|
|
int i;
|
|
|
|
for (i = 0; i < dp->num_lanes; i++) {
|
|
ret = phy_init(dp->phy[i]);
|
|
if (ret) {
|
|
dev_err(dp->dev, "failed to init phy lane %d\n", i);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
zynqmp_dp_clr(dp, ZYNQMP_DP_PHY_RESET, ZYNQMP_DP_PHY_RESET_ALL_RESET);
|
|
|
|
/*
|
|
* Power on lanes in reverse order as only lane 0 waits for the PLL to
|
|
* lock.
|
|
*/
|
|
for (i = dp->num_lanes - 1; i >= 0; i--) {
|
|
ret = phy_power_on(dp->phy[i]);
|
|
if (ret) {
|
|
dev_err(dp->dev, "failed to power on phy lane %d\n", i);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* zynqmp_dp_phy_exit - Exit the phy
|
|
* @dp: DisplayPort IP core structure
|
|
*
|
|
* Exit the phy.
|
|
*/
|
|
static void zynqmp_dp_phy_exit(struct zynqmp_dp *dp)
|
|
{
|
|
unsigned int i;
|
|
int ret;
|
|
|
|
for (i = 0; i < dp->num_lanes; i++) {
|
|
ret = phy_power_off(dp->phy[i]);
|
|
if (ret)
|
|
dev_err(dp->dev, "failed to power off phy(%d) %d\n", i,
|
|
ret);
|
|
}
|
|
|
|
for (i = 0; i < dp->num_lanes; i++) {
|
|
ret = phy_exit(dp->phy[i]);
|
|
if (ret)
|
|
dev_err(dp->dev, "failed to exit phy(%d) %d\n", i, ret);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* zynqmp_dp_phy_probe - Probe the PHYs
|
|
* @dp: DisplayPort IP core structure
|
|
*
|
|
* Probe PHYs for all lanes. Less PHYs may be available than the number of
|
|
* lanes, which is not considered an error as long as at least one PHY is
|
|
* found. The caller can check dp->num_lanes to check how many PHYs were found.
|
|
*
|
|
* Return:
|
|
* * 0 - Success
|
|
* * -ENXIO - No PHY found
|
|
* * -EPROBE_DEFER - Probe deferral requested
|
|
* * Other negative value - PHY retrieval failure
|
|
*/
|
|
static int zynqmp_dp_phy_probe(struct zynqmp_dp *dp)
|
|
{
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < ZYNQMP_DP_MAX_LANES; i++) {
|
|
char phy_name[16];
|
|
struct phy *phy;
|
|
|
|
snprintf(phy_name, sizeof(phy_name), "dp-phy%d", i);
|
|
phy = devm_phy_get(dp->dev, phy_name);
|
|
|
|
if (IS_ERR(phy)) {
|
|
switch (PTR_ERR(phy)) {
|
|
case -ENODEV:
|
|
if (dp->num_lanes)
|
|
return 0;
|
|
|
|
dev_err(dp->dev, "no PHY found\n");
|
|
return -ENXIO;
|
|
|
|
case -EPROBE_DEFER:
|
|
return -EPROBE_DEFER;
|
|
|
|
default:
|
|
dev_err(dp->dev, "failed to get PHY lane %u\n",
|
|
i);
|
|
return PTR_ERR(phy);
|
|
}
|
|
}
|
|
|
|
dp->phy[i] = phy;
|
|
dp->num_lanes++;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* zynqmp_dp_phy_ready - Check if PHY is ready
|
|
* @dp: DisplayPort IP core structure
|
|
*
|
|
* Check if PHY is ready. If PHY is not ready, wait 1ms to check for 100 times.
|
|
* This amount of delay was suggested by IP designer.
|
|
*
|
|
* Return: 0 if PHY is ready, or -ENODEV if PHY is not ready.
|
|
*/
|
|
static int zynqmp_dp_phy_ready(struct zynqmp_dp *dp)
|
|
{
|
|
u32 i, reg, ready;
|
|
|
|
ready = (1 << dp->num_lanes) - 1;
|
|
|
|
/* Wait for 100 * 1ms. This should be enough time for PHY to be ready */
|
|
for (i = 0; ; i++) {
|
|
reg = zynqmp_dp_read(dp, ZYNQMP_DP_PHY_STATUS);
|
|
if ((reg & ready) == ready)
|
|
return 0;
|
|
|
|
if (i == 100) {
|
|
dev_err(dp->dev, "PHY isn't ready\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
usleep_range(1000, 1100);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* -----------------------------------------------------------------------------
|
|
* DisplayPort Link Training
|
|
*/
|
|
|
|
/**
|
|
* zynqmp_dp_max_rate - Calculate and return available max pixel clock
|
|
* @link_rate: link rate (Kilo-bytes / sec)
|
|
* @lane_num: number of lanes
|
|
* @bpp: bits per pixel
|
|
*
|
|
* Return: max pixel clock (KHz) supported by current link config.
|
|
*/
|
|
static inline int zynqmp_dp_max_rate(int link_rate, u8 lane_num, u8 bpp)
|
|
{
|
|
return link_rate * lane_num * 8 / bpp;
|
|
}
|
|
|
|
/**
|
|
* zynqmp_dp_mode_configure - Configure the link values
|
|
* @dp: DisplayPort IP core structure
|
|
* @pclock: pixel clock for requested display mode
|
|
* @current_bw: current link rate
|
|
*
|
|
* Find the link configuration values, rate and lane count for requested pixel
|
|
* clock @pclock. The @pclock is stored in the mode to be used in other
|
|
* functions later. The returned rate is downshifted from the current rate
|
|
* @current_bw.
|
|
*
|
|
* Return: Current link rate code, or -EINVAL.
|
|
*/
|
|
static int zynqmp_dp_mode_configure(struct zynqmp_dp *dp, int pclock,
|
|
u8 current_bw)
|
|
{
|
|
int max_rate = dp->link_config.max_rate;
|
|
u8 bw_code;
|
|
u8 max_lanes = dp->link_config.max_lanes;
|
|
u8 max_link_rate_code = drm_dp_link_rate_to_bw_code(max_rate);
|
|
u8 bpp = dp->config.bpp;
|
|
u8 lane_cnt;
|
|
|
|
/* Downshift from current bandwidth */
|
|
switch (current_bw) {
|
|
case DP_LINK_BW_5_4:
|
|
bw_code = DP_LINK_BW_2_7;
|
|
break;
|
|
case DP_LINK_BW_2_7:
|
|
bw_code = DP_LINK_BW_1_62;
|
|
break;
|
|
case DP_LINK_BW_1_62:
|
|
dev_err(dp->dev, "can't downshift. already lowest link rate\n");
|
|
return -EINVAL;
|
|
default:
|
|
/* If not given, start with max supported */
|
|
bw_code = max_link_rate_code;
|
|
break;
|
|
}
|
|
|
|
for (lane_cnt = 1; lane_cnt <= max_lanes; lane_cnt <<= 1) {
|
|
int bw;
|
|
u32 rate;
|
|
|
|
bw = drm_dp_bw_code_to_link_rate(bw_code);
|
|
rate = zynqmp_dp_max_rate(bw, lane_cnt, bpp);
|
|
if (pclock <= rate) {
|
|
dp->mode.bw_code = bw_code;
|
|
dp->mode.lane_cnt = lane_cnt;
|
|
dp->mode.pclock = pclock;
|
|
return dp->mode.bw_code;
|
|
}
|
|
}
|
|
|
|
dev_err(dp->dev, "failed to configure link values\n");
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
/**
|
|
* zynqmp_dp_adjust_train - Adjust train values
|
|
* @dp: DisplayPort IP core structure
|
|
* @link_status: link status from sink which contains requested training values
|
|
*/
|
|
static void zynqmp_dp_adjust_train(struct zynqmp_dp *dp,
|
|
u8 link_status[DP_LINK_STATUS_SIZE])
|
|
{
|
|
u8 *train_set = dp->train_set;
|
|
u8 voltage = 0, preemphasis = 0;
|
|
u8 i;
|
|
|
|
for (i = 0; i < dp->mode.lane_cnt; i++) {
|
|
u8 v = drm_dp_get_adjust_request_voltage(link_status, i);
|
|
u8 p = drm_dp_get_adjust_request_pre_emphasis(link_status, i);
|
|
|
|
if (v > voltage)
|
|
voltage = v;
|
|
|
|
if (p > preemphasis)
|
|
preemphasis = p;
|
|
}
|
|
|
|
if (voltage >= DP_TRAIN_VOLTAGE_SWING_LEVEL_3)
|
|
voltage |= DP_TRAIN_MAX_SWING_REACHED;
|
|
|
|
if (preemphasis >= DP_TRAIN_PRE_EMPH_LEVEL_2)
|
|
preemphasis |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
|
|
|
|
for (i = 0; i < dp->mode.lane_cnt; i++)
|
|
train_set[i] = voltage | preemphasis;
|
|
}
|
|
|
|
/**
|
|
* zynqmp_dp_update_vs_emph - Update the training values
|
|
* @dp: DisplayPort IP core structure
|
|
*
|
|
* Update the training values based on the request from sink. The mapped values
|
|
* are predefined, and values(vs, pe, pc) are from the device manual.
|
|
*
|
|
* Return: 0 if vs and emph are updated successfully, or the error code returned
|
|
* by drm_dp_dpcd_write().
|
|
*/
|
|
static int zynqmp_dp_update_vs_emph(struct zynqmp_dp *dp)
|
|
{
|
|
unsigned int i;
|
|
int ret;
|
|
|
|
ret = drm_dp_dpcd_write(&dp->aux, DP_TRAINING_LANE0_SET, dp->train_set,
|
|
dp->mode.lane_cnt);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
for (i = 0; i < dp->mode.lane_cnt; i++) {
|
|
u32 reg = ZYNQMP_DP_SUB_TX_PHY_PRECURSOR_LANE_0 + i * 4;
|
|
union phy_configure_opts opts = { 0 };
|
|
u8 train = dp->train_set[i];
|
|
|
|
opts.dp.voltage[0] = (train & DP_TRAIN_VOLTAGE_SWING_MASK)
|
|
>> DP_TRAIN_VOLTAGE_SWING_SHIFT;
|
|
opts.dp.pre[0] = (train & DP_TRAIN_PRE_EMPHASIS_MASK)
|
|
>> DP_TRAIN_PRE_EMPHASIS_SHIFT;
|
|
|
|
phy_configure(dp->phy[i], &opts);
|
|
|
|
zynqmp_dp_write(dp, reg, 0x2);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* zynqmp_dp_link_train_cr - Train clock recovery
|
|
* @dp: DisplayPort IP core structure
|
|
*
|
|
* Return: 0 if clock recovery train is done successfully, or corresponding
|
|
* error code.
|
|
*/
|
|
static int zynqmp_dp_link_train_cr(struct zynqmp_dp *dp)
|
|
{
|
|
u8 link_status[DP_LINK_STATUS_SIZE];
|
|
u8 lane_cnt = dp->mode.lane_cnt;
|
|
u8 vs = 0, tries = 0;
|
|
u16 max_tries, i;
|
|
bool cr_done;
|
|
int ret;
|
|
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_TRAINING_PATTERN_SET,
|
|
DP_TRAINING_PATTERN_1);
|
|
ret = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET,
|
|
DP_TRAINING_PATTERN_1 |
|
|
DP_LINK_SCRAMBLING_DISABLE);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/*
|
|
* 256 loops should be maximum iterations for 4 lanes and 4 values.
|
|
* So, This loop should exit before 512 iterations
|
|
*/
|
|
for (max_tries = 0; max_tries < 512; max_tries++) {
|
|
ret = zynqmp_dp_update_vs_emph(dp);
|
|
if (ret)
|
|
return ret;
|
|
|
|
drm_dp_link_train_clock_recovery_delay(&dp->aux, dp->dpcd);
|
|
ret = drm_dp_dpcd_read_link_status(&dp->aux, link_status);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
cr_done = drm_dp_clock_recovery_ok(link_status, lane_cnt);
|
|
if (cr_done)
|
|
break;
|
|
|
|
for (i = 0; i < lane_cnt; i++)
|
|
if (!(dp->train_set[i] & DP_TRAIN_MAX_SWING_REACHED))
|
|
break;
|
|
if (i == lane_cnt)
|
|
break;
|
|
|
|
if ((dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) == vs)
|
|
tries++;
|
|
else
|
|
tries = 0;
|
|
|
|
if (tries == DP_MAX_TRAINING_TRIES)
|
|
break;
|
|
|
|
vs = dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK;
|
|
zynqmp_dp_adjust_train(dp, link_status);
|
|
}
|
|
|
|
if (!cr_done)
|
|
return -EIO;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* zynqmp_dp_link_train_ce - Train channel equalization
|
|
* @dp: DisplayPort IP core structure
|
|
*
|
|
* Return: 0 if channel equalization train is done successfully, or
|
|
* corresponding error code.
|
|
*/
|
|
static int zynqmp_dp_link_train_ce(struct zynqmp_dp *dp)
|
|
{
|
|
u8 link_status[DP_LINK_STATUS_SIZE];
|
|
u8 lane_cnt = dp->mode.lane_cnt;
|
|
u32 pat, tries;
|
|
int ret;
|
|
bool ce_done;
|
|
|
|
if (dp->dpcd[DP_DPCD_REV] >= DP_V1_2 &&
|
|
dp->dpcd[DP_MAX_LANE_COUNT] & DP_TPS3_SUPPORTED)
|
|
pat = DP_TRAINING_PATTERN_3;
|
|
else
|
|
pat = DP_TRAINING_PATTERN_2;
|
|
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_TRAINING_PATTERN_SET, pat);
|
|
ret = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET,
|
|
pat | DP_LINK_SCRAMBLING_DISABLE);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
for (tries = 0; tries < DP_MAX_TRAINING_TRIES; tries++) {
|
|
ret = zynqmp_dp_update_vs_emph(dp);
|
|
if (ret)
|
|
return ret;
|
|
|
|
drm_dp_link_train_channel_eq_delay(&dp->aux, dp->dpcd);
|
|
ret = drm_dp_dpcd_read_link_status(&dp->aux, link_status);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ce_done = drm_dp_channel_eq_ok(link_status, lane_cnt);
|
|
if (ce_done)
|
|
break;
|
|
|
|
zynqmp_dp_adjust_train(dp, link_status);
|
|
}
|
|
|
|
if (!ce_done)
|
|
return -EIO;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* zynqmp_dp_link_train - Train the link
|
|
* @dp: DisplayPort IP core structure
|
|
*
|
|
* Return: 0 if all trains are done successfully, or corresponding error code.
|
|
*/
|
|
static int zynqmp_dp_train(struct zynqmp_dp *dp)
|
|
{
|
|
u32 reg;
|
|
u8 bw_code = dp->mode.bw_code;
|
|
u8 lane_cnt = dp->mode.lane_cnt;
|
|
u8 aux_lane_cnt = lane_cnt;
|
|
bool enhanced;
|
|
int ret;
|
|
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_LANE_COUNT_SET, lane_cnt);
|
|
enhanced = drm_dp_enhanced_frame_cap(dp->dpcd);
|
|
if (enhanced) {
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_ENHANCED_FRAME_EN, 1);
|
|
aux_lane_cnt |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
|
|
}
|
|
|
|
if (dp->dpcd[3] & 0x1) {
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_DOWNSPREAD_CTL, 1);
|
|
drm_dp_dpcd_writeb(&dp->aux, DP_DOWNSPREAD_CTRL,
|
|
DP_SPREAD_AMP_0_5);
|
|
} else {
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_DOWNSPREAD_CTL, 0);
|
|
drm_dp_dpcd_writeb(&dp->aux, DP_DOWNSPREAD_CTRL, 0);
|
|
}
|
|
|
|
ret = drm_dp_dpcd_writeb(&dp->aux, DP_LANE_COUNT_SET, aux_lane_cnt);
|
|
if (ret < 0) {
|
|
dev_err(dp->dev, "failed to set lane count\n");
|
|
return ret;
|
|
}
|
|
|
|
ret = drm_dp_dpcd_writeb(&dp->aux, DP_MAIN_LINK_CHANNEL_CODING_SET,
|
|
DP_SET_ANSI_8B10B);
|
|
if (ret < 0) {
|
|
dev_err(dp->dev, "failed to set ANSI 8B/10B encoding\n");
|
|
return ret;
|
|
}
|
|
|
|
ret = drm_dp_dpcd_writeb(&dp->aux, DP_LINK_BW_SET, bw_code);
|
|
if (ret < 0) {
|
|
dev_err(dp->dev, "failed to set DP bandwidth\n");
|
|
return ret;
|
|
}
|
|
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_LINK_BW_SET, bw_code);
|
|
switch (bw_code) {
|
|
case DP_LINK_BW_1_62:
|
|
reg = ZYNQMP_DP_PHY_CLOCK_SELECT_1_62G;
|
|
break;
|
|
case DP_LINK_BW_2_7:
|
|
reg = ZYNQMP_DP_PHY_CLOCK_SELECT_2_70G;
|
|
break;
|
|
case DP_LINK_BW_5_4:
|
|
default:
|
|
reg = ZYNQMP_DP_PHY_CLOCK_SELECT_5_40G;
|
|
break;
|
|
}
|
|
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_PHY_CLOCK_SELECT, reg);
|
|
ret = zynqmp_dp_phy_ready(dp);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_SCRAMBLING_DISABLE, 1);
|
|
memset(dp->train_set, 0, sizeof(dp->train_set));
|
|
ret = zynqmp_dp_link_train_cr(dp);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = zynqmp_dp_link_train_ce(dp);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET,
|
|
DP_TRAINING_PATTERN_DISABLE);
|
|
if (ret < 0) {
|
|
dev_err(dp->dev, "failed to disable training pattern\n");
|
|
return ret;
|
|
}
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_TRAINING_PATTERN_SET,
|
|
DP_TRAINING_PATTERN_DISABLE);
|
|
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_SCRAMBLING_DISABLE, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* zynqmp_dp_train_loop - Downshift the link rate during training
|
|
* @dp: DisplayPort IP core structure
|
|
*
|
|
* Train the link by downshifting the link rate if training is not successful.
|
|
*/
|
|
static void zynqmp_dp_train_loop(struct zynqmp_dp *dp)
|
|
{
|
|
struct zynqmp_dp_mode *mode = &dp->mode;
|
|
u8 bw = mode->bw_code;
|
|
int ret;
|
|
|
|
do {
|
|
if (dp->status == connector_status_disconnected ||
|
|
!dp->enabled)
|
|
return;
|
|
|
|
ret = zynqmp_dp_train(dp);
|
|
if (!ret)
|
|
return;
|
|
|
|
ret = zynqmp_dp_mode_configure(dp, mode->pclock, bw);
|
|
if (ret < 0)
|
|
goto err_out;
|
|
|
|
bw = ret;
|
|
} while (bw >= DP_LINK_BW_1_62);
|
|
|
|
err_out:
|
|
dev_err(dp->dev, "failed to train the DP link\n");
|
|
}
|
|
|
|
/* -----------------------------------------------------------------------------
|
|
* DisplayPort AUX
|
|
*/
|
|
|
|
#define AUX_READ_BIT 0x1
|
|
|
|
/**
|
|
* zynqmp_dp_aux_cmd_submit - Submit aux command
|
|
* @dp: DisplayPort IP core structure
|
|
* @cmd: aux command
|
|
* @addr: aux address
|
|
* @buf: buffer for command data
|
|
* @bytes: number of bytes for @buf
|
|
* @reply: reply code to be returned
|
|
*
|
|
* Submit an aux command. All aux related commands, native or i2c aux
|
|
* read/write, are submitted through this function. The function is mapped to
|
|
* the transfer function of struct drm_dp_aux. This function involves in
|
|
* multiple register reads/writes, thus synchronization is needed, and it is
|
|
* done by drm_dp_helper using @hw_mutex. The calling thread goes into sleep
|
|
* if there's no immediate reply to the command submission. The reply code is
|
|
* returned at @reply if @reply != NULL.
|
|
*
|
|
* Return: 0 if the command is submitted properly, or corresponding error code:
|
|
* -EBUSY when there is any request already being processed
|
|
* -ETIMEDOUT when receiving reply is timed out
|
|
* -EIO when received bytes are less than requested
|
|
*/
|
|
static int zynqmp_dp_aux_cmd_submit(struct zynqmp_dp *dp, u32 cmd, u16 addr,
|
|
u8 *buf, u8 bytes, u8 *reply)
|
|
{
|
|
bool is_read = (cmd & AUX_READ_BIT) ? true : false;
|
|
u32 reg, i;
|
|
|
|
reg = zynqmp_dp_read(dp, ZYNQMP_DP_INTERRUPT_SIGNAL_STATE);
|
|
if (reg & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REQUEST)
|
|
return -EBUSY;
|
|
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_AUX_ADDRESS, addr);
|
|
if (!is_read)
|
|
for (i = 0; i < bytes; i++)
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_AUX_WRITE_FIFO,
|
|
buf[i]);
|
|
|
|
reg = cmd << ZYNQMP_DP_AUX_COMMAND_CMD_SHIFT;
|
|
if (!buf || !bytes)
|
|
reg |= ZYNQMP_DP_AUX_COMMAND_ADDRESS_ONLY;
|
|
else
|
|
reg |= (bytes - 1) << ZYNQMP_DP_AUX_COMMAND_BYTES_SHIFT;
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_AUX_COMMAND, reg);
|
|
|
|
/* Wait for reply to be delivered upto 2ms */
|
|
for (i = 0; ; i++) {
|
|
reg = zynqmp_dp_read(dp, ZYNQMP_DP_INTERRUPT_SIGNAL_STATE);
|
|
if (reg & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY)
|
|
break;
|
|
|
|
if (reg & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY_TIMEOUT ||
|
|
i == 2)
|
|
return -ETIMEDOUT;
|
|
|
|
usleep_range(1000, 1100);
|
|
}
|
|
|
|
reg = zynqmp_dp_read(dp, ZYNQMP_DP_AUX_REPLY_CODE);
|
|
if (reply)
|
|
*reply = reg;
|
|
|
|
if (is_read &&
|
|
(reg == ZYNQMP_DP_AUX_REPLY_CODE_AUX_ACK ||
|
|
reg == ZYNQMP_DP_AUX_REPLY_CODE_I2C_ACK)) {
|
|
reg = zynqmp_dp_read(dp, ZYNQMP_DP_REPLY_DATA_COUNT);
|
|
if ((reg & ZYNQMP_DP_REPLY_DATA_COUNT_MASK) != bytes)
|
|
return -EIO;
|
|
|
|
for (i = 0; i < bytes; i++)
|
|
buf[i] = zynqmp_dp_read(dp, ZYNQMP_DP_AUX_REPLY_DATA);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t
|
|
zynqmp_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
|
|
{
|
|
struct zynqmp_dp *dp = container_of(aux, struct zynqmp_dp, aux);
|
|
int ret;
|
|
unsigned int i, iter;
|
|
|
|
/* Number of loops = timeout in msec / aux delay (400 usec) */
|
|
iter = zynqmp_dp_aux_timeout_ms * 1000 / 400;
|
|
iter = iter ? iter : 1;
|
|
|
|
for (i = 0; i < iter; i++) {
|
|
ret = zynqmp_dp_aux_cmd_submit(dp, msg->request, msg->address,
|
|
msg->buffer, msg->size,
|
|
&msg->reply);
|
|
if (!ret) {
|
|
dev_dbg(dp->dev, "aux %d retries\n", i);
|
|
return msg->size;
|
|
}
|
|
|
|
if (dp->status == connector_status_disconnected) {
|
|
dev_dbg(dp->dev, "no connected aux device\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
usleep_range(400, 500);
|
|
}
|
|
|
|
dev_dbg(dp->dev, "failed to do aux transfer (%d)\n", ret);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* zynqmp_dp_aux_init - Initialize and register the DP AUX
|
|
* @dp: DisplayPort IP core structure
|
|
*
|
|
* Program the AUX clock divider and filter and register the DP AUX adapter.
|
|
*
|
|
* Return: 0 on success, error value otherwise
|
|
*/
|
|
static int zynqmp_dp_aux_init(struct zynqmp_dp *dp)
|
|
{
|
|
unsigned long rate;
|
|
unsigned int w;
|
|
|
|
/*
|
|
* The AUX_SIGNAL_WIDTH_FILTER is the number of APB clock cycles
|
|
* corresponding to the AUX pulse. Allowable values are 8, 16, 24, 32,
|
|
* 40 and 48. The AUX pulse width must be between 0.4µs and 0.6µs,
|
|
* compute the w / 8 value corresponding to 0.4µs rounded up, and make
|
|
* sure it stays below 0.6µs and within the allowable values.
|
|
*/
|
|
rate = clk_get_rate(dp->dpsub->apb_clk);
|
|
w = DIV_ROUND_UP(4 * rate, 1000 * 1000 * 10 * 8) * 8;
|
|
if (w > 6 * rate / (1000 * 1000 * 10) || w > 48) {
|
|
dev_err(dp->dev, "aclk frequency too high\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_AUX_CLK_DIVIDER,
|
|
(w << ZYNQMP_DP_AUX_CLK_DIVIDER_AUX_FILTER_SHIFT) |
|
|
(rate / (1000 * 1000)));
|
|
|
|
dp->aux.name = "ZynqMP DP AUX";
|
|
dp->aux.dev = dp->dev;
|
|
dp->aux.drm_dev = dp->drm;
|
|
dp->aux.transfer = zynqmp_dp_aux_transfer;
|
|
|
|
return drm_dp_aux_register(&dp->aux);
|
|
}
|
|
|
|
/**
|
|
* zynqmp_dp_aux_cleanup - Cleanup the DP AUX
|
|
* @dp: DisplayPort IP core structure
|
|
*
|
|
* Unregister the DP AUX adapter.
|
|
*/
|
|
static void zynqmp_dp_aux_cleanup(struct zynqmp_dp *dp)
|
|
{
|
|
drm_dp_aux_unregister(&dp->aux);
|
|
}
|
|
|
|
/* -----------------------------------------------------------------------------
|
|
* DisplayPort Generic Support
|
|
*/
|
|
|
|
/**
|
|
* zynqmp_dp_update_misc - Write the misc registers
|
|
* @dp: DisplayPort IP core structure
|
|
*
|
|
* The misc register values are stored in the structure, and this
|
|
* function applies the values into the registers.
|
|
*/
|
|
static void zynqmp_dp_update_misc(struct zynqmp_dp *dp)
|
|
{
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_MISC0, dp->config.misc0);
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_MISC1, dp->config.misc1);
|
|
}
|
|
|
|
/**
|
|
* zynqmp_dp_set_format - Set the input format
|
|
* @dp: DisplayPort IP core structure
|
|
* @format: input format
|
|
* @bpc: bits per component
|
|
*
|
|
* Update misc register values based on input @format and @bpc.
|
|
*
|
|
* Return: 0 on success, or -EINVAL.
|
|
*/
|
|
static int zynqmp_dp_set_format(struct zynqmp_dp *dp,
|
|
enum zynqmp_dpsub_format format,
|
|
unsigned int bpc)
|
|
{
|
|
static const struct drm_display_info *display;
|
|
struct zynqmp_dp_config *config = &dp->config;
|
|
unsigned int num_colors;
|
|
|
|
config->misc0 &= ~ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_MASK;
|
|
config->misc1 &= ~ZYNQMP_DP_MAIN_STREAM_MISC1_Y_ONLY_EN;
|
|
|
|
switch (format) {
|
|
case ZYNQMP_DPSUB_FORMAT_RGB:
|
|
config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_RGB;
|
|
num_colors = 3;
|
|
break;
|
|
|
|
case ZYNQMP_DPSUB_FORMAT_YCRCB444:
|
|
config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_YCRCB_444;
|
|
num_colors = 3;
|
|
break;
|
|
|
|
case ZYNQMP_DPSUB_FORMAT_YCRCB422:
|
|
config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_YCRCB_422;
|
|
num_colors = 2;
|
|
break;
|
|
|
|
case ZYNQMP_DPSUB_FORMAT_YONLY:
|
|
config->misc1 |= ZYNQMP_DP_MAIN_STREAM_MISC1_Y_ONLY_EN;
|
|
num_colors = 1;
|
|
break;
|
|
|
|
default:
|
|
dev_err(dp->dev, "Invalid colormetry in DT\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
display = &dp->connector.display_info;
|
|
if (display->bpc && bpc > display->bpc) {
|
|
dev_warn(dp->dev,
|
|
"downgrading requested %ubpc to display limit %ubpc\n",
|
|
bpc, display->bpc);
|
|
bpc = display->bpc;
|
|
}
|
|
|
|
config->misc0 &= ~ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_MASK;
|
|
|
|
switch (bpc) {
|
|
case 6:
|
|
config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_6;
|
|
break;
|
|
case 8:
|
|
config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_8;
|
|
break;
|
|
case 10:
|
|
config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_10;
|
|
break;
|
|
case 12:
|
|
config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_12;
|
|
break;
|
|
case 16:
|
|
config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_16;
|
|
break;
|
|
default:
|
|
dev_warn(dp->dev, "Not supported bpc (%u). fall back to 8bpc\n",
|
|
bpc);
|
|
config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_8;
|
|
bpc = 8;
|
|
break;
|
|
}
|
|
|
|
/* Update the current bpp based on the format. */
|
|
config->bpp = bpc * num_colors;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* zynqmp_dp_encoder_mode_set_transfer_unit - Set the transfer unit values
|
|
* @dp: DisplayPort IP core structure
|
|
* @mode: requested display mode
|
|
*
|
|
* Set the transfer unit, and calculate all transfer unit size related values.
|
|
* Calculation is based on DP and IP core specification.
|
|
*/
|
|
static void
|
|
zynqmp_dp_encoder_mode_set_transfer_unit(struct zynqmp_dp *dp,
|
|
struct drm_display_mode *mode)
|
|
{
|
|
u32 tu = ZYNQMP_DP_MSA_TRANSFER_UNIT_SIZE_TU_SIZE_DEF;
|
|
u32 bw, vid_kbytes, avg_bytes_per_tu, init_wait;
|
|
|
|
/* Use the max transfer unit size (default) */
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_MSA_TRANSFER_UNIT_SIZE, tu);
|
|
|
|
vid_kbytes = mode->clock * (dp->config.bpp / 8);
|
|
bw = drm_dp_bw_code_to_link_rate(dp->mode.bw_code);
|
|
avg_bytes_per_tu = vid_kbytes * tu / (dp->mode.lane_cnt * bw / 1000);
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_MIN_BYTES_PER_TU,
|
|
avg_bytes_per_tu / 1000);
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_FRAC_BYTES_PER_TU,
|
|
avg_bytes_per_tu % 1000);
|
|
|
|
/* Configure the initial wait cycle based on transfer unit size */
|
|
if (tu < (avg_bytes_per_tu / 1000))
|
|
init_wait = 0;
|
|
else if ((avg_bytes_per_tu / 1000) <= 4)
|
|
init_wait = tu;
|
|
else
|
|
init_wait = tu - avg_bytes_per_tu / 1000;
|
|
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_INIT_WAIT, init_wait);
|
|
}
|
|
|
|
/**
|
|
* zynqmp_dp_encoder_mode_set_stream - Configure the main stream
|
|
* @dp: DisplayPort IP core structure
|
|
* @mode: requested display mode
|
|
*
|
|
* Configure the main stream based on the requested mode @mode. Calculation is
|
|
* based on IP core specification.
|
|
*/
|
|
static void zynqmp_dp_encoder_mode_set_stream(struct zynqmp_dp *dp,
|
|
const struct drm_display_mode *mode)
|
|
{
|
|
u8 lane_cnt = dp->mode.lane_cnt;
|
|
u32 reg, wpl;
|
|
unsigned int rate;
|
|
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_HTOTAL, mode->htotal);
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_VTOTAL, mode->vtotal);
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_POLARITY,
|
|
(!!(mode->flags & DRM_MODE_FLAG_PVSYNC) <<
|
|
ZYNQMP_DP_MAIN_STREAM_POLARITY_VSYNC_SHIFT) |
|
|
(!!(mode->flags & DRM_MODE_FLAG_PHSYNC) <<
|
|
ZYNQMP_DP_MAIN_STREAM_POLARITY_HSYNC_SHIFT));
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_HSWIDTH,
|
|
mode->hsync_end - mode->hsync_start);
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_VSWIDTH,
|
|
mode->vsync_end - mode->vsync_start);
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_HRES, mode->hdisplay);
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_VRES, mode->vdisplay);
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_HSTART,
|
|
mode->htotal - mode->hsync_start);
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_VSTART,
|
|
mode->vtotal - mode->vsync_start);
|
|
|
|
/* In synchronous mode, set the diviers */
|
|
if (dp->config.misc0 & ZYNQMP_DP_MAIN_STREAM_MISC0_SYNC_LOCK) {
|
|
reg = drm_dp_bw_code_to_link_rate(dp->mode.bw_code);
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_N_VID, reg);
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_M_VID, mode->clock);
|
|
rate = zynqmp_disp_get_audio_clk_rate(dp->dpsub->disp);
|
|
if (rate) {
|
|
dev_dbg(dp->dev, "Audio rate: %d\n", rate / 512);
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_TX_N_AUD, reg);
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_TX_M_AUD, rate / 1000);
|
|
}
|
|
}
|
|
|
|
/* Only 2 channel audio is supported now */
|
|
if (zynqmp_disp_audio_enabled(dp->dpsub->disp))
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_TX_AUDIO_CHANNELS, 1);
|
|
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_USER_PIX_WIDTH, 1);
|
|
|
|
/* Translate to the native 16 bit datapath based on IP core spec */
|
|
wpl = (mode->hdisplay * dp->config.bpp + 15) / 16;
|
|
reg = wpl + wpl % lane_cnt - lane_cnt;
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_USER_DATA_COUNT_PER_LANE, reg);
|
|
}
|
|
|
|
/* -----------------------------------------------------------------------------
|
|
* DRM Connector
|
|
*/
|
|
|
|
static enum drm_connector_status
|
|
zynqmp_dp_connector_detect(struct drm_connector *connector, bool force)
|
|
{
|
|
struct zynqmp_dp *dp = connector_to_dp(connector);
|
|
struct zynqmp_dp_link_config *link_config = &dp->link_config;
|
|
u32 state, i;
|
|
int ret;
|
|
|
|
/*
|
|
* This is from heuristic. It takes some delay (ex, 100 ~ 500 msec) to
|
|
* get the HPD signal with some monitors.
|
|
*/
|
|
for (i = 0; i < 10; i++) {
|
|
state = zynqmp_dp_read(dp, ZYNQMP_DP_INTERRUPT_SIGNAL_STATE);
|
|
if (state & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_HPD)
|
|
break;
|
|
msleep(100);
|
|
}
|
|
|
|
if (state & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_HPD) {
|
|
ret = drm_dp_dpcd_read(&dp->aux, 0x0, dp->dpcd,
|
|
sizeof(dp->dpcd));
|
|
if (ret < 0) {
|
|
dev_dbg(dp->dev, "DPCD read failed");
|
|
goto disconnected;
|
|
}
|
|
|
|
link_config->max_rate = min_t(int,
|
|
drm_dp_max_link_rate(dp->dpcd),
|
|
DP_HIGH_BIT_RATE2);
|
|
link_config->max_lanes = min_t(u8,
|
|
drm_dp_max_lane_count(dp->dpcd),
|
|
dp->num_lanes);
|
|
|
|
dp->status = connector_status_connected;
|
|
return connector_status_connected;
|
|
}
|
|
|
|
disconnected:
|
|
dp->status = connector_status_disconnected;
|
|
return connector_status_disconnected;
|
|
}
|
|
|
|
static int zynqmp_dp_connector_get_modes(struct drm_connector *connector)
|
|
{
|
|
struct zynqmp_dp *dp = connector_to_dp(connector);
|
|
struct edid *edid;
|
|
int ret;
|
|
|
|
edid = drm_get_edid(connector, &dp->aux.ddc);
|
|
if (!edid)
|
|
return 0;
|
|
|
|
drm_connector_update_edid_property(connector, edid);
|
|
ret = drm_add_edid_modes(connector, edid);
|
|
kfree(edid);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct drm_encoder *
|
|
zynqmp_dp_connector_best_encoder(struct drm_connector *connector)
|
|
{
|
|
struct zynqmp_dp *dp = connector_to_dp(connector);
|
|
|
|
return &dp->encoder;
|
|
}
|
|
|
|
static int zynqmp_dp_connector_mode_valid(struct drm_connector *connector,
|
|
struct drm_display_mode *mode)
|
|
{
|
|
struct zynqmp_dp *dp = connector_to_dp(connector);
|
|
u8 max_lanes = dp->link_config.max_lanes;
|
|
u8 bpp = dp->config.bpp;
|
|
int max_rate = dp->link_config.max_rate;
|
|
int rate;
|
|
|
|
if (mode->clock > ZYNQMP_MAX_FREQ) {
|
|
dev_dbg(dp->dev, "filtered the mode, %s,for high pixel rate\n",
|
|
mode->name);
|
|
drm_mode_debug_printmodeline(mode);
|
|
return MODE_CLOCK_HIGH;
|
|
}
|
|
|
|
/* Check with link rate and lane count */
|
|
rate = zynqmp_dp_max_rate(max_rate, max_lanes, bpp);
|
|
if (mode->clock > rate) {
|
|
dev_dbg(dp->dev, "filtered the mode, %s,for high pixel rate\n",
|
|
mode->name);
|
|
drm_mode_debug_printmodeline(mode);
|
|
return MODE_CLOCK_HIGH;
|
|
}
|
|
|
|
return MODE_OK;
|
|
}
|
|
|
|
static const struct drm_connector_funcs zynqmp_dp_connector_funcs = {
|
|
.detect = zynqmp_dp_connector_detect,
|
|
.fill_modes = drm_helper_probe_single_connector_modes,
|
|
.destroy = drm_connector_cleanup,
|
|
.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
|
|
.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
|
|
.reset = drm_atomic_helper_connector_reset,
|
|
};
|
|
|
|
static const struct drm_connector_helper_funcs
|
|
zynqmp_dp_connector_helper_funcs = {
|
|
.get_modes = zynqmp_dp_connector_get_modes,
|
|
.best_encoder = zynqmp_dp_connector_best_encoder,
|
|
.mode_valid = zynqmp_dp_connector_mode_valid,
|
|
};
|
|
|
|
/* -----------------------------------------------------------------------------
|
|
* DRM Encoder
|
|
*/
|
|
|
|
static void zynqmp_dp_encoder_enable(struct drm_encoder *encoder)
|
|
{
|
|
struct zynqmp_dp *dp = encoder_to_dp(encoder);
|
|
unsigned int i;
|
|
int ret = 0;
|
|
|
|
pm_runtime_get_sync(dp->dev);
|
|
dp->enabled = true;
|
|
zynqmp_dp_update_misc(dp);
|
|
if (zynqmp_disp_audio_enabled(dp->dpsub->disp))
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_TX_AUDIO_CONTROL, 1);
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_TX_PHY_POWER_DOWN, 0);
|
|
if (dp->status == connector_status_connected) {
|
|
for (i = 0; i < 3; i++) {
|
|
ret = drm_dp_dpcd_writeb(&dp->aux, DP_SET_POWER,
|
|
DP_SET_POWER_D0);
|
|
if (ret == 1)
|
|
break;
|
|
usleep_range(300, 500);
|
|
}
|
|
/* Some monitors take time to wake up properly */
|
|
msleep(zynqmp_dp_power_on_delay_ms);
|
|
}
|
|
if (ret != 1)
|
|
dev_dbg(dp->dev, "DP aux failed\n");
|
|
else
|
|
zynqmp_dp_train_loop(dp);
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_SOFTWARE_RESET,
|
|
ZYNQMP_DP_SOFTWARE_RESET_ALL);
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_ENABLE, 1);
|
|
}
|
|
|
|
static void zynqmp_dp_encoder_disable(struct drm_encoder *encoder)
|
|
{
|
|
struct zynqmp_dp *dp = encoder_to_dp(encoder);
|
|
|
|
dp->enabled = false;
|
|
cancel_delayed_work(&dp->hpd_work);
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_ENABLE, 0);
|
|
drm_dp_dpcd_writeb(&dp->aux, DP_SET_POWER, DP_SET_POWER_D3);
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_TX_PHY_POWER_DOWN,
|
|
ZYNQMP_DP_TX_PHY_POWER_DOWN_ALL);
|
|
if (zynqmp_disp_audio_enabled(dp->dpsub->disp))
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_TX_AUDIO_CONTROL, 0);
|
|
pm_runtime_put_sync(dp->dev);
|
|
}
|
|
|
|
static void
|
|
zynqmp_dp_encoder_atomic_mode_set(struct drm_encoder *encoder,
|
|
struct drm_crtc_state *crtc_state,
|
|
struct drm_connector_state *connector_state)
|
|
{
|
|
struct zynqmp_dp *dp = encoder_to_dp(encoder);
|
|
struct drm_display_mode *mode = &crtc_state->mode;
|
|
struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
|
|
u8 max_lanes = dp->link_config.max_lanes;
|
|
u8 bpp = dp->config.bpp;
|
|
int rate, max_rate = dp->link_config.max_rate;
|
|
int ret;
|
|
|
|
zynqmp_dp_set_format(dp, ZYNQMP_DPSUB_FORMAT_RGB, 8);
|
|
|
|
/* Check again as bpp or format might have been chagned */
|
|
rate = zynqmp_dp_max_rate(max_rate, max_lanes, bpp);
|
|
if (mode->clock > rate) {
|
|
dev_err(dp->dev, "the mode, %s,has too high pixel rate\n",
|
|
mode->name);
|
|
drm_mode_debug_printmodeline(mode);
|
|
}
|
|
|
|
ret = zynqmp_dp_mode_configure(dp, adjusted_mode->clock, 0);
|
|
if (ret < 0)
|
|
return;
|
|
|
|
zynqmp_dp_encoder_mode_set_transfer_unit(dp, adjusted_mode);
|
|
zynqmp_dp_encoder_mode_set_stream(dp, adjusted_mode);
|
|
}
|
|
|
|
#define ZYNQMP_DP_MIN_H_BACKPORCH 20
|
|
|
|
static int
|
|
zynqmp_dp_encoder_atomic_check(struct drm_encoder *encoder,
|
|
struct drm_crtc_state *crtc_state,
|
|
struct drm_connector_state *conn_state)
|
|
{
|
|
struct drm_display_mode *mode = &crtc_state->mode;
|
|
struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
|
|
int diff = mode->htotal - mode->hsync_end;
|
|
|
|
/*
|
|
* ZynqMP DP requires horizontal backporch to be greater than 12.
|
|
* This limitation may not be compatible with the sink device.
|
|
*/
|
|
if (diff < ZYNQMP_DP_MIN_H_BACKPORCH) {
|
|
int vrefresh = (adjusted_mode->clock * 1000) /
|
|
(adjusted_mode->vtotal * adjusted_mode->htotal);
|
|
|
|
dev_dbg(encoder->dev->dev, "hbackporch adjusted: %d to %d",
|
|
diff, ZYNQMP_DP_MIN_H_BACKPORCH - diff);
|
|
diff = ZYNQMP_DP_MIN_H_BACKPORCH - diff;
|
|
adjusted_mode->htotal += diff;
|
|
adjusted_mode->clock = adjusted_mode->vtotal *
|
|
adjusted_mode->htotal * vrefresh / 1000;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct drm_encoder_helper_funcs zynqmp_dp_encoder_helper_funcs = {
|
|
.enable = zynqmp_dp_encoder_enable,
|
|
.disable = zynqmp_dp_encoder_disable,
|
|
.atomic_mode_set = zynqmp_dp_encoder_atomic_mode_set,
|
|
.atomic_check = zynqmp_dp_encoder_atomic_check,
|
|
};
|
|
|
|
/* -----------------------------------------------------------------------------
|
|
* Interrupt Handling
|
|
*/
|
|
|
|
/**
|
|
* zynqmp_dp_enable_vblank - Enable vblank
|
|
* @dp: DisplayPort IP core structure
|
|
*
|
|
* Enable vblank interrupt
|
|
*/
|
|
void zynqmp_dp_enable_vblank(struct zynqmp_dp *dp)
|
|
{
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_INT_EN, ZYNQMP_DP_INT_VBLANK_START);
|
|
}
|
|
|
|
/**
|
|
* zynqmp_dp_disable_vblank - Disable vblank
|
|
* @dp: DisplayPort IP core structure
|
|
*
|
|
* Disable vblank interrupt
|
|
*/
|
|
void zynqmp_dp_disable_vblank(struct zynqmp_dp *dp)
|
|
{
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, ZYNQMP_DP_INT_VBLANK_START);
|
|
}
|
|
|
|
static void zynqmp_dp_hpd_work_func(struct work_struct *work)
|
|
{
|
|
struct zynqmp_dp *dp;
|
|
|
|
dp = container_of(work, struct zynqmp_dp, hpd_work.work);
|
|
|
|
if (dp->drm)
|
|
drm_helper_hpd_irq_event(dp->drm);
|
|
}
|
|
|
|
static irqreturn_t zynqmp_dp_irq_handler(int irq, void *data)
|
|
{
|
|
struct zynqmp_dp *dp = (struct zynqmp_dp *)data;
|
|
u32 status, mask;
|
|
|
|
status = zynqmp_dp_read(dp, ZYNQMP_DP_INT_STATUS);
|
|
mask = zynqmp_dp_read(dp, ZYNQMP_DP_INT_MASK);
|
|
if (!(status & ~mask))
|
|
return IRQ_NONE;
|
|
|
|
/* dbg for diagnostic, but not much that the driver can do */
|
|
if (status & ZYNQMP_DP_INT_CHBUF_UNDERFLW_MASK)
|
|
dev_dbg_ratelimited(dp->dev, "underflow interrupt\n");
|
|
if (status & ZYNQMP_DP_INT_CHBUF_OVERFLW_MASK)
|
|
dev_dbg_ratelimited(dp->dev, "overflow interrupt\n");
|
|
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_INT_STATUS, status);
|
|
|
|
if (status & ZYNQMP_DP_INT_VBLANK_START)
|
|
zynqmp_disp_handle_vblank(dp->dpsub->disp);
|
|
|
|
if (status & ZYNQMP_DP_INT_HPD_EVENT)
|
|
schedule_delayed_work(&dp->hpd_work, 0);
|
|
|
|
if (status & ZYNQMP_DP_INT_HPD_IRQ) {
|
|
int ret;
|
|
u8 status[DP_LINK_STATUS_SIZE + 2];
|
|
|
|
ret = drm_dp_dpcd_read(&dp->aux, DP_SINK_COUNT, status,
|
|
DP_LINK_STATUS_SIZE + 2);
|
|
if (ret < 0)
|
|
goto handled;
|
|
|
|
if (status[4] & DP_LINK_STATUS_UPDATED ||
|
|
!drm_dp_clock_recovery_ok(&status[2], dp->mode.lane_cnt) ||
|
|
!drm_dp_channel_eq_ok(&status[2], dp->mode.lane_cnt)) {
|
|
zynqmp_dp_train_loop(dp);
|
|
}
|
|
}
|
|
|
|
handled:
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/* -----------------------------------------------------------------------------
|
|
* Initialization & Cleanup
|
|
*/
|
|
|
|
int zynqmp_dp_drm_init(struct zynqmp_dpsub *dpsub)
|
|
{
|
|
struct zynqmp_dp *dp = dpsub->dp;
|
|
struct drm_encoder *encoder = &dp->encoder;
|
|
struct drm_connector *connector = &dp->connector;
|
|
int ret;
|
|
|
|
dp->config.misc0 &= ~ZYNQMP_DP_MAIN_STREAM_MISC0_SYNC_LOCK;
|
|
zynqmp_dp_set_format(dp, ZYNQMP_DPSUB_FORMAT_RGB, 8);
|
|
|
|
/* Create the DRM encoder and connector. */
|
|
encoder->possible_crtcs |= zynqmp_disp_get_crtc_mask(dpsub->disp);
|
|
drm_simple_encoder_init(dp->drm, encoder, DRM_MODE_ENCODER_TMDS);
|
|
drm_encoder_helper_add(encoder, &zynqmp_dp_encoder_helper_funcs);
|
|
|
|
connector->polled = DRM_CONNECTOR_POLL_HPD;
|
|
ret = drm_connector_init(encoder->dev, connector,
|
|
&zynqmp_dp_connector_funcs,
|
|
DRM_MODE_CONNECTOR_DisplayPort);
|
|
if (ret) {
|
|
dev_err(dp->dev, "failed to create the DRM connector\n");
|
|
return ret;
|
|
}
|
|
|
|
drm_connector_helper_add(connector, &zynqmp_dp_connector_helper_funcs);
|
|
drm_connector_register(connector);
|
|
drm_connector_attach_encoder(connector, encoder);
|
|
|
|
/* Initialize and register the AUX adapter. */
|
|
ret = zynqmp_dp_aux_init(dp);
|
|
if (ret) {
|
|
dev_err(dp->dev, "failed to initialize DP aux\n");
|
|
return ret;
|
|
}
|
|
|
|
/* Now that initialisation is complete, enable interrupts. */
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_INT_EN, ZYNQMP_DP_INT_ALL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int zynqmp_dp_probe(struct zynqmp_dpsub *dpsub, struct drm_device *drm)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(dpsub->dev);
|
|
struct zynqmp_dp *dp;
|
|
struct resource *res;
|
|
int ret;
|
|
|
|
dp = drmm_kzalloc(drm, sizeof(*dp), GFP_KERNEL);
|
|
if (!dp)
|
|
return -ENOMEM;
|
|
|
|
dp->dev = &pdev->dev;
|
|
dp->dpsub = dpsub;
|
|
dp->status = connector_status_disconnected;
|
|
dp->drm = drm;
|
|
|
|
INIT_DELAYED_WORK(&dp->hpd_work, zynqmp_dp_hpd_work_func);
|
|
|
|
dpsub->dp = dp;
|
|
|
|
/* Acquire all resources (IOMEM, IRQ and PHYs). */
|
|
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dp");
|
|
dp->iomem = devm_ioremap_resource(dp->dev, res);
|
|
if (IS_ERR(dp->iomem))
|
|
return PTR_ERR(dp->iomem);
|
|
|
|
dp->irq = platform_get_irq(pdev, 0);
|
|
if (dp->irq < 0)
|
|
return dp->irq;
|
|
|
|
dp->reset = devm_reset_control_get(dp->dev, NULL);
|
|
if (IS_ERR(dp->reset)) {
|
|
if (PTR_ERR(dp->reset) != -EPROBE_DEFER)
|
|
dev_err(dp->dev, "failed to get reset: %ld\n",
|
|
PTR_ERR(dp->reset));
|
|
return PTR_ERR(dp->reset);
|
|
}
|
|
|
|
ret = zynqmp_dp_reset(dp, false);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = zynqmp_dp_phy_probe(dp);
|
|
if (ret)
|
|
goto err_reset;
|
|
|
|
/* Initialize the hardware. */
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_TX_PHY_POWER_DOWN,
|
|
ZYNQMP_DP_TX_PHY_POWER_DOWN_ALL);
|
|
zynqmp_dp_set(dp, ZYNQMP_DP_PHY_RESET, ZYNQMP_DP_PHY_RESET_ALL_RESET);
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_FORCE_SCRAMBLER_RESET, 1);
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_TRANSMITTER_ENABLE, 0);
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, 0xffffffff);
|
|
|
|
ret = zynqmp_dp_phy_init(dp);
|
|
if (ret)
|
|
goto err_reset;
|
|
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_TRANSMITTER_ENABLE, 1);
|
|
|
|
/*
|
|
* Now that the hardware is initialized and won't generate spurious
|
|
* interrupts, request the IRQ.
|
|
*/
|
|
ret = devm_request_threaded_irq(dp->dev, dp->irq, NULL,
|
|
zynqmp_dp_irq_handler, IRQF_ONESHOT,
|
|
dev_name(dp->dev), dp);
|
|
if (ret < 0)
|
|
goto err_phy_exit;
|
|
|
|
dev_dbg(dp->dev, "ZynqMP DisplayPort Tx probed with %u lanes\n",
|
|
dp->num_lanes);
|
|
|
|
return 0;
|
|
|
|
err_phy_exit:
|
|
zynqmp_dp_phy_exit(dp);
|
|
err_reset:
|
|
zynqmp_dp_reset(dp, true);
|
|
|
|
return ret;
|
|
}
|
|
|
|
void zynqmp_dp_remove(struct zynqmp_dpsub *dpsub)
|
|
{
|
|
struct zynqmp_dp *dp = dpsub->dp;
|
|
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, ZYNQMP_DP_INT_ALL);
|
|
disable_irq(dp->irq);
|
|
|
|
cancel_delayed_work_sync(&dp->hpd_work);
|
|
zynqmp_dp_aux_cleanup(dp);
|
|
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_TRANSMITTER_ENABLE, 0);
|
|
zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, 0xffffffff);
|
|
|
|
zynqmp_dp_phy_exit(dp);
|
|
zynqmp_dp_reset(dp, true);
|
|
}
|