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kernel/drivers/gpu/drm/bridge/ite-it66121.c

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init repo.
2024-07-22 17:22:30 +08:00
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2020 BayLibre, SAS
* Author: Phong LE <ple@baylibre.com>
* Copyright (C) 2018-2019, Artem Mygaiev
* Copyright (C) 2017, Fresco Logic, Incorporated.
*
*/
#include <linux/module.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/i2c.h>
#include <linux/bitfield.h>
#include <linux/property.h>
#include <linux/regmap.h>
#include <linux/of_graph.h>
#include <linux/gpio/consumer.h>
#include <linux/pinctrl/consumer.h>
#include <linux/regulator/consumer.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_bridge.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_edid.h>
#include <drm/drm_modes.h>
#include <drm/drm_print.h>
#include <drm/drm_probe_helper.h>
#define IT66121_VENDOR_ID0_REG 0x00
#define IT66121_VENDOR_ID1_REG 0x01
#define IT66121_DEVICE_ID0_REG 0x02
#define IT66121_DEVICE_ID1_REG 0x03
#define IT66121_VENDOR_ID0 0x54
#define IT66121_VENDOR_ID1 0x49
#define IT66121_DEVICE_ID0 0x12
#define IT66121_DEVICE_ID1 0x06
#define IT66121_REVISION_MASK GENMASK(7, 4)
#define IT66121_DEVICE_ID1_MASK GENMASK(3, 0)
#define IT66121_MASTER_SEL_REG 0x10
#define IT66121_MASTER_SEL_HOST BIT(0)
#define IT66121_AFE_DRV_REG 0x61
#define IT66121_AFE_DRV_RST BIT(4)
#define IT66121_AFE_DRV_PWD BIT(5)
#define IT66121_INPUT_MODE_REG 0x70
#define IT66121_INPUT_MODE_RGB (0 << 6)
#define IT66121_INPUT_MODE_YUV422 BIT(6)
#define IT66121_INPUT_MODE_YUV444 (2 << 6)
#define IT66121_INPUT_MODE_CCIR656 BIT(4)
#define IT66121_INPUT_MODE_SYNCEMB BIT(3)
#define IT66121_INPUT_MODE_DDR BIT(2)
#define IT66121_INPUT_CSC_REG 0x72
#define IT66121_INPUT_CSC_ENDITHER BIT(7)
#define IT66121_INPUT_CSC_ENUDFILTER BIT(6)
#define IT66121_INPUT_CSC_DNFREE_GO BIT(5)
#define IT66121_INPUT_CSC_RGB_TO_YUV 0x02
#define IT66121_INPUT_CSC_YUV_TO_RGB 0x03
#define IT66121_INPUT_CSC_NO_CONV 0x00
#define IT66121_AFE_XP_REG 0x62
#define IT66121_AFE_XP_GAINBIT BIT(7)
#define IT66121_AFE_XP_PWDPLL BIT(6)
#define IT66121_AFE_XP_ENI BIT(5)
#define IT66121_AFE_XP_ENO BIT(4)
#define IT66121_AFE_XP_RESETB BIT(3)
#define IT66121_AFE_XP_PWDI BIT(2)
#define IT66121_AFE_IP_REG 0x64
#define IT66121_AFE_IP_GAINBIT BIT(7)
#define IT66121_AFE_IP_PWDPLL BIT(6)
#define IT66121_AFE_IP_CKSEL_05 (0 << 4)
#define IT66121_AFE_IP_CKSEL_1 BIT(4)
#define IT66121_AFE_IP_CKSEL_2 (2 << 4)
#define IT66121_AFE_IP_CKSEL_2OR4 (3 << 4)
#define IT66121_AFE_IP_ER0 BIT(3)
#define IT66121_AFE_IP_RESETB BIT(2)
#define IT66121_AFE_IP_ENC BIT(1)
#define IT66121_AFE_IP_EC1 BIT(0)
#define IT66121_AFE_XP_EC1_REG 0x68
#define IT66121_AFE_XP_EC1_LOWCLK BIT(4)
#define IT66121_SW_RST_REG 0x04
#define IT66121_SW_RST_REF BIT(5)
#define IT66121_SW_RST_AREF BIT(4)
#define IT66121_SW_RST_VID BIT(3)
#define IT66121_SW_RST_AUD BIT(2)
#define IT66121_SW_RST_HDCP BIT(0)
#define IT66121_DDC_COMMAND_REG 0x15
#define IT66121_DDC_COMMAND_BURST_READ 0x0
#define IT66121_DDC_COMMAND_EDID_READ 0x3
#define IT66121_DDC_COMMAND_FIFO_CLR 0x9
#define IT66121_DDC_COMMAND_SCL_PULSE 0xA
#define IT66121_DDC_COMMAND_ABORT 0xF
#define IT66121_HDCP_REG 0x20
#define IT66121_HDCP_CPDESIRED BIT(0)
#define IT66121_HDCP_EN1P1FEAT BIT(1)
#define IT66121_INT_STATUS1_REG 0x06
#define IT66121_INT_STATUS1_AUD_OVF BIT(7)
#define IT66121_INT_STATUS1_DDC_NOACK BIT(5)
#define IT66121_INT_STATUS1_DDC_FIFOERR BIT(4)
#define IT66121_INT_STATUS1_DDC_BUSHANG BIT(2)
#define IT66121_INT_STATUS1_RX_SENS_STATUS BIT(1)
#define IT66121_INT_STATUS1_HPD_STATUS BIT(0)
#define IT66121_DDC_HEADER_REG 0x11
#define IT66121_DDC_HEADER_HDCP 0x74
#define IT66121_DDC_HEADER_EDID 0xA0
#define IT66121_DDC_OFFSET_REG 0x12
#define IT66121_DDC_BYTE_REG 0x13
#define IT66121_DDC_SEGMENT_REG 0x14
#define IT66121_DDC_RD_FIFO_REG 0x17
#define IT66121_CLK_BANK_REG 0x0F
#define IT66121_CLK_BANK_PWROFF_RCLK BIT(6)
#define IT66121_CLK_BANK_PWROFF_ACLK BIT(5)
#define IT66121_CLK_BANK_PWROFF_TXCLK BIT(4)
#define IT66121_CLK_BANK_PWROFF_CRCLK BIT(3)
#define IT66121_CLK_BANK_0 0
#define IT66121_CLK_BANK_1 1
#define IT66121_INT_REG 0x05
#define IT66121_INT_ACTIVE_HIGH BIT(7)
#define IT66121_INT_OPEN_DRAIN BIT(6)
#define IT66121_INT_TX_CLK_OFF BIT(0)
#define IT66121_INT_MASK1_REG 0x09
#define IT66121_INT_MASK1_AUD_OVF BIT(7)
#define IT66121_INT_MASK1_DDC_NOACK BIT(5)
#define IT66121_INT_MASK1_DDC_FIFOERR BIT(4)
#define IT66121_INT_MASK1_DDC_BUSHANG BIT(2)
#define IT66121_INT_MASK1_RX_SENS BIT(1)
#define IT66121_INT_MASK1_HPD BIT(0)
#define IT66121_INT_CLR1_REG 0x0C
#define IT66121_INT_CLR1_PKTACP BIT(7)
#define IT66121_INT_CLR1_PKTNULL BIT(6)
#define IT66121_INT_CLR1_PKTGEN BIT(5)
#define IT66121_INT_CLR1_KSVLISTCHK BIT(4)
#define IT66121_INT_CLR1_AUTHDONE BIT(3)
#define IT66121_INT_CLR1_AUTHFAIL BIT(2)
#define IT66121_INT_CLR1_RX_SENS BIT(1)
#define IT66121_INT_CLR1_HPD BIT(0)
#define IT66121_AV_MUTE_REG 0xC1
#define IT66121_AV_MUTE_ON BIT(0)
#define IT66121_AV_MUTE_BLUESCR BIT(1)
#define IT66121_PKT_GEN_CTRL_REG 0xC6
#define IT66121_PKT_GEN_CTRL_ON BIT(0)
#define IT66121_PKT_GEN_CTRL_RPT BIT(1)
#define IT66121_AVIINFO_DB1_REG 0x158
#define IT66121_AVIINFO_DB2_REG 0x159
#define IT66121_AVIINFO_DB3_REG 0x15A
#define IT66121_AVIINFO_DB4_REG 0x15B
#define IT66121_AVIINFO_DB5_REG 0x15C
#define IT66121_AVIINFO_CSUM_REG 0x15D
#define IT66121_AVIINFO_DB6_REG 0x15E
#define IT66121_AVIINFO_DB7_REG 0x15F
#define IT66121_AVIINFO_DB8_REG 0x160
#define IT66121_AVIINFO_DB9_REG 0x161
#define IT66121_AVIINFO_DB10_REG 0x162
#define IT66121_AVIINFO_DB11_REG 0x163
#define IT66121_AVIINFO_DB12_REG 0x164
#define IT66121_AVIINFO_DB13_REG 0x165
#define IT66121_AVI_INFO_PKT_REG 0xCD
#define IT66121_AVI_INFO_PKT_ON BIT(0)
#define IT66121_AVI_INFO_PKT_RPT BIT(1)
#define IT66121_HDMI_MODE_REG 0xC0
#define IT66121_HDMI_MODE_HDMI BIT(0)
#define IT66121_SYS_STATUS_REG 0x0E
#define IT66121_SYS_STATUS_ACTIVE_IRQ BIT(7)
#define IT66121_SYS_STATUS_HPDETECT BIT(6)
#define IT66121_SYS_STATUS_SENDECTECT BIT(5)
#define IT66121_SYS_STATUS_VID_STABLE BIT(4)
#define IT66121_SYS_STATUS_AUD_CTS_CLR BIT(1)
#define IT66121_SYS_STATUS_CLEAR_IRQ BIT(0)
#define IT66121_DDC_STATUS_REG 0x16
#define IT66121_DDC_STATUS_TX_DONE BIT(7)
#define IT66121_DDC_STATUS_ACTIVE BIT(6)
#define IT66121_DDC_STATUS_NOACK BIT(5)
#define IT66121_DDC_STATUS_WAIT_BUS BIT(4)
#define IT66121_DDC_STATUS_ARBI_LOSE BIT(3)
#define IT66121_DDC_STATUS_FIFO_FULL BIT(2)
#define IT66121_DDC_STATUS_FIFO_EMPTY BIT(1)
#define IT66121_DDC_STATUS_FIFO_VALID BIT(0)
#define IT66121_EDID_SLEEP_US 20000
#define IT66121_EDID_TIMEOUT_US 200000
#define IT66121_EDID_FIFO_SIZE 32
#define IT66121_AFE_CLK_HIGH 80000 /* Khz */
struct it66121_ctx {
struct regmap *regmap;
struct drm_bridge bridge;
struct drm_bridge *next_bridge;
struct drm_connector *connector;
struct device *dev;
struct gpio_desc *gpio_reset;
struct i2c_client *client;
struct regulator_bulk_data supplies[3];
u32 bus_width;
struct mutex lock; /* Protects fields below and device registers */
struct hdmi_avi_infoframe hdmi_avi_infoframe;
};
static const struct regmap_range_cfg it66121_regmap_banks[] = {
{
.name = "it66121",
.range_min = 0x00,
.range_max = 0x1FF,
.selector_reg = IT66121_CLK_BANK_REG,
.selector_mask = 0x1,
.selector_shift = 0,
.window_start = 0x00,
.window_len = 0x100,
},
};
static const struct regmap_config it66121_regmap_config = {
.val_bits = 8,
.reg_bits = 8,
.max_register = 0x1FF,
.ranges = it66121_regmap_banks,
.num_ranges = ARRAY_SIZE(it66121_regmap_banks),
};
static void it66121_hw_reset(struct it66121_ctx *ctx)
{
gpiod_set_value(ctx->gpio_reset, 1);
msleep(20);
gpiod_set_value(ctx->gpio_reset, 0);
}
static inline int ite66121_power_on(struct it66121_ctx *ctx)
{
return regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
}
static inline int ite66121_power_off(struct it66121_ctx *ctx)
{
return regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
}
static inline int it66121_preamble_ddc(struct it66121_ctx *ctx)
{
return regmap_write(ctx->regmap, IT66121_MASTER_SEL_REG, IT66121_MASTER_SEL_HOST);
}
static inline int it66121_fire_afe(struct it66121_ctx *ctx)
{
return regmap_write(ctx->regmap, IT66121_AFE_DRV_REG, 0);
}
/* TOFIX: Handle YCbCr Input & Output */
static int it66121_configure_input(struct it66121_ctx *ctx)
{
int ret;
u8 mode = IT66121_INPUT_MODE_RGB;
if (ctx->bus_width == 12)
mode |= IT66121_INPUT_MODE_DDR;
ret = regmap_write(ctx->regmap, IT66121_INPUT_MODE_REG, mode);
if (ret)
return ret;
return regmap_write(ctx->regmap, IT66121_INPUT_CSC_REG, IT66121_INPUT_CSC_NO_CONV);
}
/**
* it66121_configure_afe() - Configure the analog front end
* @ctx: it66121_ctx object
* @mode: mode to configure
*
* RETURNS:
* zero if success, a negative error code otherwise.
*/
static int it66121_configure_afe(struct it66121_ctx *ctx,
const struct drm_display_mode *mode)
{
int ret;
ret = regmap_write(ctx->regmap, IT66121_AFE_DRV_REG,
IT66121_AFE_DRV_RST);
if (ret)
return ret;
if (mode->clock > IT66121_AFE_CLK_HIGH) {
ret = regmap_write_bits(ctx->regmap, IT66121_AFE_XP_REG,
IT66121_AFE_XP_GAINBIT |
IT66121_AFE_XP_ENO,
IT66121_AFE_XP_GAINBIT);
if (ret)
return ret;
ret = regmap_write_bits(ctx->regmap, IT66121_AFE_IP_REG,
IT66121_AFE_IP_GAINBIT |
IT66121_AFE_IP_ER0 |
IT66121_AFE_IP_EC1,
IT66121_AFE_IP_GAINBIT);
if (ret)
return ret;
ret = regmap_write_bits(ctx->regmap, IT66121_AFE_XP_EC1_REG,
IT66121_AFE_XP_EC1_LOWCLK, 0x80);
if (ret)
return ret;
} else {
ret = regmap_write_bits(ctx->regmap, IT66121_AFE_XP_REG,
IT66121_AFE_XP_GAINBIT |
IT66121_AFE_XP_ENO,
IT66121_AFE_XP_ENO);
if (ret)
return ret;
ret = regmap_write_bits(ctx->regmap, IT66121_AFE_IP_REG,
IT66121_AFE_IP_GAINBIT |
IT66121_AFE_IP_ER0 |
IT66121_AFE_IP_EC1, IT66121_AFE_IP_ER0 |
IT66121_AFE_IP_EC1);
if (ret)
return ret;
ret = regmap_write_bits(ctx->regmap, IT66121_AFE_XP_EC1_REG,
IT66121_AFE_XP_EC1_LOWCLK,
IT66121_AFE_XP_EC1_LOWCLK);
if (ret)
return ret;
}
/* Clear reset flags */
ret = regmap_write_bits(ctx->regmap, IT66121_SW_RST_REG,
IT66121_SW_RST_REF | IT66121_SW_RST_VID, 0);
if (ret)
return ret;
return it66121_fire_afe(ctx);
}
static inline int it66121_wait_ddc_ready(struct it66121_ctx *ctx)
{
int ret, val;
u32 busy = IT66121_DDC_STATUS_NOACK | IT66121_DDC_STATUS_WAIT_BUS |
IT66121_DDC_STATUS_ARBI_LOSE;
ret = regmap_read_poll_timeout(ctx->regmap, IT66121_DDC_STATUS_REG, val, true,
IT66121_EDID_SLEEP_US, IT66121_EDID_TIMEOUT_US);
if (ret)
return ret;
if (val & busy)
return -EAGAIN;
return 0;
}
static int it66121_clear_ddc_fifo(struct it66121_ctx *ctx)
{
int ret;
ret = it66121_preamble_ddc(ctx);
if (ret)
return ret;
return regmap_write(ctx->regmap, IT66121_DDC_COMMAND_REG,
IT66121_DDC_COMMAND_FIFO_CLR);
}
static int it66121_abort_ddc_ops(struct it66121_ctx *ctx)
{
int ret;
unsigned int swreset, cpdesire;
ret = regmap_read(ctx->regmap, IT66121_SW_RST_REG, &swreset);
if (ret)
return ret;
ret = regmap_read(ctx->regmap, IT66121_HDCP_REG, &cpdesire);
if (ret)
return ret;
ret = regmap_write(ctx->regmap, IT66121_HDCP_REG,
cpdesire & (~IT66121_HDCP_CPDESIRED & 0xFF));
if (ret)
return ret;
ret = regmap_write(ctx->regmap, IT66121_SW_RST_REG,
(swreset | IT66121_SW_RST_HDCP));
if (ret)
return ret;
ret = it66121_preamble_ddc(ctx);
if (ret)
return ret;
ret = regmap_write(ctx->regmap, IT66121_DDC_COMMAND_REG,
IT66121_DDC_COMMAND_ABORT);
if (ret)
return ret;
return it66121_wait_ddc_ready(ctx);
}
static int it66121_get_edid_block(void *context, u8 *buf,
unsigned int block, size_t len)
{
struct it66121_ctx *ctx = context;
unsigned int val;
int remain = len;
int offset = 0;
int ret, cnt;
offset = (block % 2) * len;
block = block / 2;
ret = regmap_read(ctx->regmap, IT66121_INT_STATUS1_REG, &val);
if (ret)
return ret;
if (val & IT66121_INT_STATUS1_DDC_BUSHANG) {
ret = it66121_abort_ddc_ops(ctx);
if (ret)
return ret;
}
ret = it66121_clear_ddc_fifo(ctx);
if (ret)
return ret;
while (remain > 0) {
cnt = (remain > IT66121_EDID_FIFO_SIZE) ?
IT66121_EDID_FIFO_SIZE : remain;
ret = it66121_preamble_ddc(ctx);
if (ret)
return ret;
ret = regmap_write(ctx->regmap, IT66121_DDC_COMMAND_REG,
IT66121_DDC_COMMAND_FIFO_CLR);
if (ret)
return ret;
ret = it66121_wait_ddc_ready(ctx);
if (ret)
return ret;
ret = regmap_read(ctx->regmap, IT66121_INT_STATUS1_REG, &val);
if (ret)
return ret;
if (val & IT66121_INT_STATUS1_DDC_BUSHANG) {
ret = it66121_abort_ddc_ops(ctx);
if (ret)
return ret;
}
ret = it66121_preamble_ddc(ctx);
if (ret)
return ret;
ret = regmap_write(ctx->regmap, IT66121_DDC_HEADER_REG,
IT66121_DDC_HEADER_EDID);
if (ret)
return ret;
ret = regmap_write(ctx->regmap, IT66121_DDC_OFFSET_REG, offset);
if (ret)
return ret;
ret = regmap_write(ctx->regmap, IT66121_DDC_BYTE_REG, cnt);
if (ret)
return ret;
ret = regmap_write(ctx->regmap, IT66121_DDC_SEGMENT_REG, block);
if (ret)
return ret;
ret = regmap_write(ctx->regmap, IT66121_DDC_COMMAND_REG,
IT66121_DDC_COMMAND_EDID_READ);
if (ret)
return ret;
offset += cnt;
remain -= cnt;
/* Per programming manual, sleep here before emptying the FIFO */
msleep(20);
ret = it66121_wait_ddc_ready(ctx);
if (ret)
return ret;
do {
ret = regmap_read(ctx->regmap, IT66121_DDC_RD_FIFO_REG, &val);
if (ret)
return ret;
*(buf++) = val;
cnt--;
} while (cnt > 0);
}
return 0;
}
static bool it66121_is_hpd_detect(struct it66121_ctx *ctx)
{
int val;
if (regmap_read(ctx->regmap, IT66121_SYS_STATUS_REG, &val))
return false;
return val & IT66121_SYS_STATUS_HPDETECT;
}
static int it66121_bridge_attach(struct drm_bridge *bridge,
enum drm_bridge_attach_flags flags)
{
struct it66121_ctx *ctx = container_of(bridge, struct it66121_ctx, bridge);
int ret;
if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR))
return -EINVAL;
ret = drm_bridge_attach(bridge->encoder, ctx->next_bridge, bridge, flags);
if (ret)
return ret;
ret = regmap_write_bits(ctx->regmap, IT66121_CLK_BANK_REG,
IT66121_CLK_BANK_PWROFF_RCLK, 0);
if (ret)
return ret;
ret = regmap_write_bits(ctx->regmap, IT66121_INT_REG,
IT66121_INT_TX_CLK_OFF, 0);
if (ret)
return ret;
ret = regmap_write_bits(ctx->regmap, IT66121_AFE_DRV_REG,
IT66121_AFE_DRV_PWD, 0);
if (ret)
return ret;
ret = regmap_write_bits(ctx->regmap, IT66121_AFE_XP_REG,
IT66121_AFE_XP_PWDI | IT66121_AFE_XP_PWDPLL, 0);
if (ret)
return ret;
ret = regmap_write_bits(ctx->regmap, IT66121_AFE_IP_REG,
IT66121_AFE_IP_PWDPLL, 0);
if (ret)
return ret;
ret = regmap_write_bits(ctx->regmap, IT66121_AFE_DRV_REG,
IT66121_AFE_DRV_RST, 0);
if (ret)
return ret;
ret = regmap_write_bits(ctx->regmap, IT66121_AFE_XP_REG,
IT66121_AFE_XP_RESETB, IT66121_AFE_XP_RESETB);
if (ret)
return ret;
ret = regmap_write_bits(ctx->regmap, IT66121_AFE_IP_REG,
IT66121_AFE_IP_RESETB, IT66121_AFE_IP_RESETB);
if (ret)
return ret;
ret = regmap_write_bits(ctx->regmap, IT66121_SW_RST_REG,
IT66121_SW_RST_REF,
IT66121_SW_RST_REF);
if (ret)
return ret;
/* Per programming manual, sleep here for bridge to settle */
msleep(50);
/* Start interrupts */
return regmap_write_bits(ctx->regmap, IT66121_INT_MASK1_REG,
IT66121_INT_MASK1_DDC_NOACK |
IT66121_INT_MASK1_DDC_FIFOERR |
IT66121_INT_MASK1_DDC_BUSHANG, 0);
}
static int it66121_set_mute(struct it66121_ctx *ctx, bool mute)
{
int ret;
unsigned int val = 0;
if (mute)
val = IT66121_AV_MUTE_ON;
ret = regmap_write_bits(ctx->regmap, IT66121_AV_MUTE_REG, IT66121_AV_MUTE_ON, val);
if (ret)
return ret;
return regmap_write(ctx->regmap, IT66121_PKT_GEN_CTRL_REG,
IT66121_PKT_GEN_CTRL_ON | IT66121_PKT_GEN_CTRL_RPT);
}
#define MAX_OUTPUT_SEL_FORMATS 1
static u32 *it66121_bridge_atomic_get_output_bus_fmts(struct drm_bridge *bridge,
struct drm_bridge_state *bridge_state,
struct drm_crtc_state *crtc_state,
struct drm_connector_state *conn_state,
unsigned int *num_output_fmts)
{
u32 *output_fmts;
output_fmts = kcalloc(MAX_OUTPUT_SEL_FORMATS, sizeof(*output_fmts),
GFP_KERNEL);
if (!output_fmts)
return NULL;
/* TOFIX handle more than MEDIA_BUS_FMT_RGB888_1X24 as output format */
output_fmts[0] = MEDIA_BUS_FMT_RGB888_1X24;
*num_output_fmts = 1;
return output_fmts;
}
#define MAX_INPUT_SEL_FORMATS 1
static u32 *it66121_bridge_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
struct drm_bridge_state *bridge_state,
struct drm_crtc_state *crtc_state,
struct drm_connector_state *conn_state,
u32 output_fmt,
unsigned int *num_input_fmts)
{
struct it66121_ctx *ctx = container_of(bridge, struct it66121_ctx, bridge);
u32 *input_fmts;
*num_input_fmts = 0;
input_fmts = kcalloc(MAX_INPUT_SEL_FORMATS, sizeof(*input_fmts),
GFP_KERNEL);
if (!input_fmts)
return NULL;
if (ctx->bus_width == 12)
/* IT66121FN Datasheet specifies Little-Endian ordering */
input_fmts[0] = MEDIA_BUS_FMT_RGB888_2X12_LE;
else
/* TOFIX support more input bus formats in 24bit width */
input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X24;
*num_input_fmts = 1;
return input_fmts;
}
static void it66121_bridge_enable(struct drm_bridge *bridge,
struct drm_bridge_state *bridge_state)
{
struct it66121_ctx *ctx = container_of(bridge, struct it66121_ctx, bridge);
struct drm_atomic_state *state = bridge_state->base.state;
ctx->connector = drm_atomic_get_new_connector_for_encoder(state, bridge->encoder);
it66121_set_mute(ctx, false);
}
static void it66121_bridge_disable(struct drm_bridge *bridge,
struct drm_bridge_state *bridge_state)
{
struct it66121_ctx *ctx = container_of(bridge, struct it66121_ctx, bridge);
it66121_set_mute(ctx, true);
ctx->connector = NULL;
}
static
void it66121_bridge_mode_set(struct drm_bridge *bridge,
const struct drm_display_mode *mode,
const struct drm_display_mode *adjusted_mode)
{
int ret, i;
u8 buf[HDMI_INFOFRAME_SIZE(AVI)];
struct it66121_ctx *ctx = container_of(bridge, struct it66121_ctx, bridge);
const u16 aviinfo_reg[HDMI_AVI_INFOFRAME_SIZE] = {
IT66121_AVIINFO_DB1_REG,
IT66121_AVIINFO_DB2_REG,
IT66121_AVIINFO_DB3_REG,
IT66121_AVIINFO_DB4_REG,
IT66121_AVIINFO_DB5_REG,
IT66121_AVIINFO_DB6_REG,
IT66121_AVIINFO_DB7_REG,
IT66121_AVIINFO_DB8_REG,
IT66121_AVIINFO_DB9_REG,
IT66121_AVIINFO_DB10_REG,
IT66121_AVIINFO_DB11_REG,
IT66121_AVIINFO_DB12_REG,
IT66121_AVIINFO_DB13_REG
};
mutex_lock(&ctx->lock);
hdmi_avi_infoframe_init(&ctx->hdmi_avi_infoframe);
ret = drm_hdmi_avi_infoframe_from_display_mode(&ctx->hdmi_avi_infoframe, ctx->connector,
adjusted_mode);
if (ret) {
DRM_ERROR("Failed to setup AVI infoframe: %d\n", ret);
goto unlock;
}
ret = hdmi_avi_infoframe_pack(&ctx->hdmi_avi_infoframe, buf, sizeof(buf));
if (ret < 0) {
DRM_ERROR("Failed to pack infoframe: %d\n", ret);
goto unlock;
}
/* Write new AVI infoframe packet */
for (i = 0; i < HDMI_AVI_INFOFRAME_SIZE; i++) {
if (regmap_write(ctx->regmap, aviinfo_reg[i], buf[i + HDMI_INFOFRAME_HEADER_SIZE]))
goto unlock;
}
if (regmap_write(ctx->regmap, IT66121_AVIINFO_CSUM_REG, buf[3]))
goto unlock;
/* Enable AVI infoframe */
if (regmap_write(ctx->regmap, IT66121_AVI_INFO_PKT_REG,
IT66121_AVI_INFO_PKT_ON | IT66121_AVI_INFO_PKT_RPT))
goto unlock;
/* Set TX mode to HDMI */
if (regmap_write(ctx->regmap, IT66121_HDMI_MODE_REG, IT66121_HDMI_MODE_HDMI))
goto unlock;
if (regmap_write_bits(ctx->regmap, IT66121_CLK_BANK_REG,
IT66121_CLK_BANK_PWROFF_TXCLK, IT66121_CLK_BANK_PWROFF_TXCLK))
goto unlock;
if (it66121_configure_input(ctx))
goto unlock;
if (it66121_configure_afe(ctx, adjusted_mode))
goto unlock;
regmap_write_bits(ctx->regmap, IT66121_CLK_BANK_REG, IT66121_CLK_BANK_PWROFF_TXCLK, 0);
unlock:
mutex_unlock(&ctx->lock);
}
static enum drm_mode_status it66121_bridge_mode_valid(struct drm_bridge *bridge,
const struct drm_display_info *info,
const struct drm_display_mode *mode)
{
struct it66121_ctx *ctx = container_of(bridge, struct it66121_ctx, bridge);
unsigned long max_clock;
max_clock = (ctx->bus_width == 12) ? 74250 : 148500;
if (mode->clock > max_clock)
return MODE_CLOCK_HIGH;
if (mode->clock < 25000)
return MODE_CLOCK_LOW;
return MODE_OK;
}
static enum drm_connector_status it66121_bridge_detect(struct drm_bridge *bridge)
{
struct it66121_ctx *ctx = container_of(bridge, struct it66121_ctx, bridge);
return it66121_is_hpd_detect(ctx) ? connector_status_connected
: connector_status_disconnected;
}
static void it66121_bridge_hpd_enable(struct drm_bridge *bridge)
{
struct it66121_ctx *ctx = container_of(bridge, struct it66121_ctx, bridge);
int ret;
ret = regmap_write_bits(ctx->regmap, IT66121_INT_MASK1_REG, IT66121_INT_MASK1_HPD, 0);
if (ret)
dev_err(ctx->dev, "failed to enable HPD IRQ\n");
}
static void it66121_bridge_hpd_disable(struct drm_bridge *bridge)
{
struct it66121_ctx *ctx = container_of(bridge, struct it66121_ctx, bridge);
int ret;
ret = regmap_write_bits(ctx->regmap, IT66121_INT_MASK1_REG,
IT66121_INT_MASK1_HPD, IT66121_INT_MASK1_HPD);
if (ret)
dev_err(ctx->dev, "failed to disable HPD IRQ\n");
}
static struct edid *it66121_bridge_get_edid(struct drm_bridge *bridge,
struct drm_connector *connector)
{
struct it66121_ctx *ctx = container_of(bridge, struct it66121_ctx, bridge);
struct edid *edid;
mutex_lock(&ctx->lock);
edid = drm_do_get_edid(connector, it66121_get_edid_block, ctx);
mutex_unlock(&ctx->lock);
return edid;
}
static const struct drm_bridge_funcs it66121_bridge_funcs = {
.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
.atomic_reset = drm_atomic_helper_bridge_reset,
.attach = it66121_bridge_attach,
.atomic_get_output_bus_fmts = it66121_bridge_atomic_get_output_bus_fmts,
.atomic_get_input_bus_fmts = it66121_bridge_atomic_get_input_bus_fmts,
.atomic_enable = it66121_bridge_enable,
.atomic_disable = it66121_bridge_disable,
.mode_set = it66121_bridge_mode_set,
.mode_valid = it66121_bridge_mode_valid,
.detect = it66121_bridge_detect,
.get_edid = it66121_bridge_get_edid,
.hpd_enable = it66121_bridge_hpd_enable,
.hpd_disable = it66121_bridge_hpd_disable,
};
static irqreturn_t it66121_irq_threaded_handler(int irq, void *dev_id)
{
int ret;
unsigned int val;
struct it66121_ctx *ctx = dev_id;
struct device *dev = ctx->dev;
enum drm_connector_status status;
bool event = false;
mutex_lock(&ctx->lock);
ret = regmap_read(ctx->regmap, IT66121_SYS_STATUS_REG, &val);
if (ret)
goto unlock;
if (!(val & IT66121_SYS_STATUS_ACTIVE_IRQ))
goto unlock;
ret = regmap_read(ctx->regmap, IT66121_INT_STATUS1_REG, &val);
if (ret) {
dev_err(dev, "Cannot read STATUS1_REG %d\n", ret);
} else {
if (val & IT66121_INT_STATUS1_DDC_FIFOERR)
it66121_clear_ddc_fifo(ctx);
if (val & (IT66121_INT_STATUS1_DDC_BUSHANG |
IT66121_INT_STATUS1_DDC_NOACK))
it66121_abort_ddc_ops(ctx);
if (val & IT66121_INT_STATUS1_HPD_STATUS) {
regmap_write_bits(ctx->regmap, IT66121_INT_CLR1_REG,
IT66121_INT_CLR1_HPD, IT66121_INT_CLR1_HPD);
status = it66121_is_hpd_detect(ctx) ? connector_status_connected
: connector_status_disconnected;
event = true;
}
}
regmap_write_bits(ctx->regmap, IT66121_SYS_STATUS_REG,
IT66121_SYS_STATUS_CLEAR_IRQ,
IT66121_SYS_STATUS_CLEAR_IRQ);
unlock:
mutex_unlock(&ctx->lock);
if (event)
drm_bridge_hpd_notify(&ctx->bridge, status);
return IRQ_HANDLED;
}
static int it66121_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
u32 revision_id, vendor_ids[2] = { 0 }, device_ids[2] = { 0 };
struct device_node *ep;
int ret;
struct it66121_ctx *ctx;
struct device *dev = &client->dev;
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
dev_err(dev, "I2C check functionality failed.\n");
return -ENXIO;
}
ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return -ENOMEM;
ep = of_graph_get_endpoint_by_regs(dev->of_node, 0, 0);
if (!ep)
return -EINVAL;
ctx->dev = dev;
ctx->client = client;
of_property_read_u32(ep, "bus-width", &ctx->bus_width);
of_node_put(ep);
if (ctx->bus_width != 12 && ctx->bus_width != 24)
return -EINVAL;
ep = of_graph_get_remote_node(dev->of_node, 1, -1);
if (!ep) {
dev_err(ctx->dev, "The endpoint is unconnected\n");
return -EINVAL;
}
if (!of_device_is_available(ep)) {
of_node_put(ep);
dev_err(ctx->dev, "The remote device is disabled\n");
return -ENODEV;
}
ctx->next_bridge = of_drm_find_bridge(ep);
of_node_put(ep);
if (!ctx->next_bridge) {
dev_dbg(ctx->dev, "Next bridge not found, deferring probe\n");
return -EPROBE_DEFER;
}
if (!ctx->next_bridge)
return -EPROBE_DEFER;
i2c_set_clientdata(client, ctx);
mutex_init(&ctx->lock);
ctx->supplies[0].supply = "vcn33";
ctx->supplies[1].supply = "vcn18";
ctx->supplies[2].supply = "vrf12";
ret = devm_regulator_bulk_get(ctx->dev, 3, ctx->supplies);
if (ret) {
dev_err(ctx->dev, "regulator_bulk failed\n");
return ret;
}
ret = ite66121_power_on(ctx);
if (ret)
return ret;
it66121_hw_reset(ctx);
ctx->regmap = devm_regmap_init_i2c(client, &it66121_regmap_config);
if (IS_ERR(ctx->regmap)) {
ite66121_power_off(ctx);
return PTR_ERR(ctx->regmap);
}
regmap_read(ctx->regmap, IT66121_VENDOR_ID0_REG, &vendor_ids[0]);
regmap_read(ctx->regmap, IT66121_VENDOR_ID1_REG, &vendor_ids[1]);
regmap_read(ctx->regmap, IT66121_DEVICE_ID0_REG, &device_ids[0]);
regmap_read(ctx->regmap, IT66121_DEVICE_ID1_REG, &device_ids[1]);
/* Revision is shared with DEVICE_ID1 */
revision_id = FIELD_GET(IT66121_REVISION_MASK, device_ids[1]);
device_ids[1] &= IT66121_DEVICE_ID1_MASK;
if (vendor_ids[0] != IT66121_VENDOR_ID0 || vendor_ids[1] != IT66121_VENDOR_ID1 ||
device_ids[0] != IT66121_DEVICE_ID0 || device_ids[1] != IT66121_DEVICE_ID1) {
ite66121_power_off(ctx);
return -ENODEV;
}
ctx->bridge.funcs = &it66121_bridge_funcs;
ctx->bridge.of_node = dev->of_node;
ctx->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
ctx->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID | DRM_BRIDGE_OP_HPD;
ret = devm_request_threaded_irq(dev, client->irq, NULL, it66121_irq_threaded_handler,
IRQF_ONESHOT, dev_name(dev), ctx);
if (ret < 0) {
dev_err(dev, "Failed to request irq %d:%d\n", client->irq, ret);
ite66121_power_off(ctx);
return ret;
}
drm_bridge_add(&ctx->bridge);
dev_info(ctx->dev, "IT66121 revision %d probed\n", revision_id);
return 0;
}
static int it66121_remove(struct i2c_client *client)
{
struct it66121_ctx *ctx = i2c_get_clientdata(client);
ite66121_power_off(ctx);
drm_bridge_remove(&ctx->bridge);
mutex_destroy(&ctx->lock);
return 0;
}
static const struct of_device_id it66121_dt_match[] = {
{ .compatible = "ite,it66121" },
{ }
};
MODULE_DEVICE_TABLE(of, it66121_dt_match);
static const struct i2c_device_id it66121_id[] = {
{ "it66121", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, it66121_id);
static struct i2c_driver it66121_driver = {
.driver = {
.name = "it66121",
.of_match_table = it66121_dt_match,
},
.probe = it66121_probe,
.remove = it66121_remove,
.id_table = it66121_id,
};
module_i2c_driver(it66121_driver);
MODULE_AUTHOR("Phong LE");
MODULE_DESCRIPTION("IT66121 HDMI transmitter driver");
MODULE_LICENSE("GPL v2");
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