298 lines
8.9 KiB
ReStructuredText
298 lines
8.9 KiB
ReStructuredText
=======================================================
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VIA Integration Graphic Chip Console Framebuffer Driver
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=======================================================
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Platform
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--------
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The console framebuffer driver is for graphics chips of
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VIA UniChrome Family
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(CLE266, PM800 / CN400 / CN300,
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P4M800CE / P4M800Pro / CN700 / VN800,
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CX700 / VX700, K8M890, P4M890,
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CN896 / P4M900, VX800, VX855)
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Driver features
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---------------
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Device: CRT, LCD, DVI
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Support viafb_mode::
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CRT:
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640x480(60, 75, 85, 100, 120 Hz), 720x480(60 Hz),
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720x576(60 Hz), 800x600(60, 75, 85, 100, 120 Hz),
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848x480(60 Hz), 856x480(60 Hz), 1024x512(60 Hz),
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1024x768(60, 75, 85, 100 Hz), 1152x864(75 Hz),
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1280x768(60 Hz), 1280x960(60 Hz), 1280x1024(60, 75, 85 Hz),
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1440x1050(60 Hz), 1600x1200(60, 75 Hz), 1280x720(60 Hz),
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1920x1080(60 Hz), 1400x1050(60 Hz), 800x480(60 Hz)
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color depth: 8 bpp, 16 bpp, 32 bpp supports.
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Support 2D hardware accelerator.
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Using the viafb module
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----------------------
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Start viafb with default settings::
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#modprobe viafb
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Start viafb with user options::
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#modprobe viafb viafb_mode=800x600 viafb_bpp=16 viafb_refresh=60
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viafb_active_dev=CRT+DVI viafb_dvi_port=DVP1
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viafb_mode1=1024x768 viafb_bpp=16 viafb_refresh1=60
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viafb_SAMM_ON=1
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viafb_mode:
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- 640x480 (default)
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- 720x480
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- 800x600
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- 1024x768
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viafb_bpp:
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- 8, 16, 32 (default:32)
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viafb_refresh:
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- 60, 75, 85, 100, 120 (default:60)
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viafb_lcd_dsp_method:
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- 0 : expansion (default)
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- 1 : centering
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viafb_lcd_mode:
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0 : LCD panel with LSB data format input (default)
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1 : LCD panel with MSB data format input
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viafb_lcd_panel_id:
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- 0 : Resolution: 640x480, Channel: single, Dithering: Enable
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- 1 : Resolution: 800x600, Channel: single, Dithering: Enable
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- 2 : Resolution: 1024x768, Channel: single, Dithering: Enable (default)
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- 3 : Resolution: 1280x768, Channel: single, Dithering: Enable
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- 4 : Resolution: 1280x1024, Channel: dual, Dithering: Enable
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- 5 : Resolution: 1400x1050, Channel: dual, Dithering: Enable
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- 6 : Resolution: 1600x1200, Channel: dual, Dithering: Enable
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- 8 : Resolution: 800x480, Channel: single, Dithering: Enable
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- 9 : Resolution: 1024x768, Channel: dual, Dithering: Enable
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- 10: Resolution: 1024x768, Channel: single, Dithering: Disable
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- 11: Resolution: 1024x768, Channel: dual, Dithering: Disable
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- 12: Resolution: 1280x768, Channel: single, Dithering: Disable
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- 13: Resolution: 1280x1024, Channel: dual, Dithering: Disable
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- 14: Resolution: 1400x1050, Channel: dual, Dithering: Disable
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- 15: Resolution: 1600x1200, Channel: dual, Dithering: Disable
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- 16: Resolution: 1366x768, Channel: single, Dithering: Disable
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- 17: Resolution: 1024x600, Channel: single, Dithering: Enable
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- 18: Resolution: 1280x768, Channel: dual, Dithering: Enable
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- 19: Resolution: 1280x800, Channel: single, Dithering: Enable
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viafb_accel:
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- 0 : No 2D Hardware Acceleration
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- 1 : 2D Hardware Acceleration (default)
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viafb_SAMM_ON:
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- 0 : viafb_SAMM_ON disable (default)
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- 1 : viafb_SAMM_ON enable
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viafb_mode1: (secondary display device)
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- 640x480 (default)
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- 720x480
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- 800x600
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- 1024x768
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viafb_bpp1: (secondary display device)
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- 8, 16, 32 (default:32)
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viafb_refresh1: (secondary display device)
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- 60, 75, 85, 100, 120 (default:60)
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viafb_active_dev:
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This option is used to specify active devices.(CRT, DVI, CRT+LCD...)
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DVI stands for DVI or HDMI, E.g., If you want to enable HDMI,
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set viafb_active_dev=DVI. In SAMM case, the previous of
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viafb_active_dev is primary device, and the following is
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secondary device.
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For example:
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To enable one device, such as DVI only, we can use::
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modprobe viafb viafb_active_dev=DVI
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To enable two devices, such as CRT+DVI::
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modprobe viafb viafb_active_dev=CRT+DVI;
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For DuoView case, we can use::
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modprobe viafb viafb_active_dev=CRT+DVI
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OR::
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modprobe viafb viafb_active_dev=DVI+CRT...
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For SAMM case:
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If CRT is primary and DVI is secondary, we should use::
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modprobe viafb viafb_active_dev=CRT+DVI viafb_SAMM_ON=1...
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If DVI is primary and CRT is secondary, we should use::
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modprobe viafb viafb_active_dev=DVI+CRT viafb_SAMM_ON=1...
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viafb_display_hardware_layout:
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This option is used to specify display hardware layout for CX700 chip.
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- 1 : LCD only
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- 2 : DVI only
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- 3 : LCD+DVI (default)
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- 4 : LCD1+LCD2 (internal + internal)
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- 16: LCD1+ExternalLCD2 (internal + external)
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viafb_second_size:
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This option is used to set second device memory size(MB) in SAMM case.
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The minimal size is 16.
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viafb_platform_epia_dvi:
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This option is used to enable DVI on EPIA - M
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- 0 : No DVI on EPIA - M (default)
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- 1 : DVI on EPIA - M
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viafb_bus_width:
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When using 24 - Bit Bus Width Digital Interface,
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this option should be set.
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- 12: 12-Bit LVDS or 12-Bit TMDS (default)
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- 24: 24-Bit LVDS or 24-Bit TMDS
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viafb_device_lcd_dualedge:
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When using Dual Edge Panel, this option should be set.
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- 0 : No Dual Edge Panel (default)
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- 1 : Dual Edge Panel
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viafb_lcd_port:
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This option is used to specify LCD output port,
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available values are "DVP0" "DVP1" "DFP_HIGHLOW" "DFP_HIGH" "DFP_LOW".
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for external LCD + external DVI on CX700(External LCD is on DVP0),
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we should use::
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modprobe viafb viafb_lcd_port=DVP0...
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Notes:
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1. CRT may not display properly for DuoView CRT & DVI display at
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the "640x480" PAL mode with DVI overscan enabled.
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2. SAMM stands for single adapter multi monitors. It is different from
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multi-head since SAMM support multi monitor at driver layers, thus fbcon
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layer doesn't even know about it; SAMM's second screen doesn't have a
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device node file, thus a user mode application can't access it directly.
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When SAMM is enabled, viafb_mode and viafb_mode1, viafb_bpp and
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viafb_bpp1, viafb_refresh and viafb_refresh1 can be different.
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3. When console is depending on viafbinfo1, dynamically change resolution
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and bpp, need to call VIAFB specified ioctl interface VIAFB_SET_DEVICE
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instead of calling common ioctl function FBIOPUT_VSCREENINFO since
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viafb doesn't support multi-head well, or it will cause screen crush.
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Configure viafb with "fbset" tool
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---------------------------------
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"fbset" is an inbox utility of Linux.
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1. Inquire current viafb information, type::
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# fbset -i
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2. Set various resolutions and viafb_refresh rates::
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# fbset <resolution-vertical_sync>
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example::
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# fbset "1024x768-75"
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or::
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# fbset -g 1024 768 1024 768 32
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Check the file "/etc/fb.modes" to find display modes available.
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3. Set the color depth::
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# fbset -depth <value>
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example::
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# fbset -depth 16
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Configure viafb via /proc
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-------------------------
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The following files exist in /proc/viafb
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supported_output_devices
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This read-only file contains a full ',' separated list containing all
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output devices that could be available on your platform. It is likely
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that not all of those have a connector on your hardware but it should
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provide a good starting point to figure out which of those names match
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a real connector.
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Example::
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# cat /proc/viafb/supported_output_devices
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iga1/output_devices, iga2/output_devices
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These two files are readable and writable. iga1 and iga2 are the two
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independent units that produce the screen image. Those images can be
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forwarded to one or more output devices. Reading those files is a way
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to query which output devices are currently used by an iga.
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Example::
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# cat /proc/viafb/iga1/output_devices
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If there are no output devices printed the output of this iga is lost.
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This can happen for example if only one (the other) iga is used.
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Writing to these files allows adjusting the output devices during
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runtime. One can add new devices, remove existing ones or switch
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between igas. Essentially you can write a ',' separated list of device
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names (or a single one) in the same format as the output to those
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files. You can add a '+' or '-' as a prefix allowing simple addition
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and removal of devices. So a prefix '+' adds the devices from your list
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to the already existing ones, '-' removes the listed devices from the
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existing ones and if no prefix is given it replaces all existing ones
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with the listed ones. If you remove devices they are expected to turn
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off. If you add devices that are already part of the other iga they are
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removed there and added to the new one.
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Examples:
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Add CRT as output device to iga1::
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# echo +CRT > /proc/viafb/iga1/output_devices
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Remove (turn off) DVP1 and LVDS1 as output devices of iga2::
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# echo -DVP1,LVDS1 > /proc/viafb/iga2/output_devices
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Replace all iga1 output devices by CRT::
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# echo CRT > /proc/viafb/iga1/output_devices
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Bootup with viafb
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-----------------
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Add the following line to your grub.conf::
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append = "video=viafb:viafb_mode=1024x768,viafb_bpp=32,viafb_refresh=85"
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VIA Framebuffer modes
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=====================
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.. include:: viafb.modes
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:literal:
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