mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-22 17:01:14 +00:00
![Lucas De Marchi](/assets/img/avatar_default.png)
Fixes generated by 'codespell' and manually reviewed. Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
252 lines
9.6 KiB
Text
252 lines
9.6 KiB
Text
|
|
VIA Integration Graphic Chip Console Framebuffer Driver
|
|
|
|
[Platform]
|
|
-----------------------
|
|
The console framebuffer driver is for graphics chips of
|
|
VIA UniChrome Family(CLE266, PM800 / CN400 / CN300,
|
|
P4M800CE / P4M800Pro / CN700 / VN800,
|
|
CX700 / VX700, K8M890, P4M890,
|
|
CN896 / P4M900, VX800, VX855)
|
|
|
|
[Driver features]
|
|
------------------------
|
|
Device: CRT, LCD, DVI
|
|
|
|
Support viafb_mode:
|
|
CRT:
|
|
640x480(60, 75, 85, 100, 120 Hz), 720x480(60 Hz),
|
|
720x576(60 Hz), 800x600(60, 75, 85, 100, 120 Hz),
|
|
848x480(60 Hz), 856x480(60 Hz), 1024x512(60 Hz),
|
|
1024x768(60, 75, 85, 100 Hz), 1152x864(75 Hz),
|
|
1280x768(60 Hz), 1280x960(60 Hz), 1280x1024(60, 75, 85 Hz),
|
|
1440x1050(60 Hz), 1600x1200(60, 75 Hz), 1280x720(60 Hz),
|
|
1920x1080(60 Hz), 1400x1050(60 Hz), 800x480(60 Hz)
|
|
|
|
color depth: 8 bpp, 16 bpp, 32 bpp supports.
|
|
|
|
Support 2D hardware accelerator.
|
|
|
|
[Using the viafb module]
|
|
-- -- --------------------
|
|
Start viafb with default settings:
|
|
#modprobe viafb
|
|
|
|
Start viafb with with user options:
|
|
#modprobe viafb viafb_mode=800x600 viafb_bpp=16 viafb_refresh=60
|
|
viafb_active_dev=CRT+DVI viafb_dvi_port=DVP1
|
|
viafb_mode1=1024x768 viafb_bpp=16 viafb_refresh1=60
|
|
viafb_SAMM_ON=1
|
|
|
|
viafb_mode:
|
|
640x480 (default)
|
|
720x480
|
|
800x600
|
|
1024x768
|
|
......
|
|
|
|
viafb_bpp:
|
|
8, 16, 32 (default:32)
|
|
|
|
viafb_refresh:
|
|
60, 75, 85, 100, 120 (default:60)
|
|
|
|
viafb_lcd_dsp_method:
|
|
0 : expansion (default)
|
|
1 : centering
|
|
|
|
viafb_lcd_mode:
|
|
0 : LCD panel with LSB data format input (default)
|
|
1 : LCD panel with MSB data format input
|
|
|
|
viafb_lcd_panel_id:
|
|
0 : Resolution: 640x480, Channel: single, Dithering: Enable
|
|
1 : Resolution: 800x600, Channel: single, Dithering: Enable
|
|
2 : Resolution: 1024x768, Channel: single, Dithering: Enable (default)
|
|
3 : Resolution: 1280x768, Channel: single, Dithering: Enable
|
|
4 : Resolution: 1280x1024, Channel: dual, Dithering: Enable
|
|
5 : Resolution: 1400x1050, Channel: dual, Dithering: Enable
|
|
6 : Resolution: 1600x1200, Channel: dual, Dithering: Enable
|
|
|
|
8 : Resolution: 800x480, Channel: single, Dithering: Enable
|
|
9 : Resolution: 1024x768, Channel: dual, Dithering: Enable
|
|
10: Resolution: 1024x768, Channel: single, Dithering: Disable
|
|
11: Resolution: 1024x768, Channel: dual, Dithering: Disable
|
|
12: Resolution: 1280x768, Channel: single, Dithering: Disable
|
|
13: Resolution: 1280x1024, Channel: dual, Dithering: Disable
|
|
14: Resolution: 1400x1050, Channel: dual, Dithering: Disable
|
|
15: Resolution: 1600x1200, Channel: dual, Dithering: Disable
|
|
16: Resolution: 1366x768, Channel: single, Dithering: Disable
|
|
17: Resolution: 1024x600, Channel: single, Dithering: Enable
|
|
18: Resolution: 1280x768, Channel: dual, Dithering: Enable
|
|
19: Resolution: 1280x800, Channel: single, Dithering: Enable
|
|
|
|
viafb_accel:
|
|
0 : No 2D Hardware Acceleration
|
|
1 : 2D Hardware Acceleration (default)
|
|
|
|
viafb_SAMM_ON:
|
|
0 : viafb_SAMM_ON disable (default)
|
|
1 : viafb_SAMM_ON enable
|
|
|
|
viafb_mode1: (secondary display device)
|
|
640x480 (default)
|
|
720x480
|
|
800x600
|
|
1024x768
|
|
... ...
|
|
|
|
viafb_bpp1: (secondary display device)
|
|
8, 16, 32 (default:32)
|
|
|
|
viafb_refresh1: (secondary display device)
|
|
60, 75, 85, 100, 120 (default:60)
|
|
|
|
viafb_active_dev:
|
|
This option is used to specify active devices.(CRT, DVI, CRT+LCD...)
|
|
DVI stands for DVI or HDMI, E.g., If you want to enable HDMI,
|
|
set viafb_active_dev=DVI. In SAMM case, the previous of
|
|
viafb_active_dev is primary device, and the following is
|
|
secondary device.
|
|
|
|
For example:
|
|
To enable one device, such as DVI only, we can use:
|
|
modprobe viafb viafb_active_dev=DVI
|
|
To enable two devices, such as CRT+DVI:
|
|
modprobe viafb viafb_active_dev=CRT+DVI;
|
|
|
|
For DuoView case, we can use:
|
|
modprobe viafb viafb_active_dev=CRT+DVI
|
|
OR
|
|
modprobe viafb viafb_active_dev=DVI+CRT...
|
|
|
|
For SAMM case:
|
|
If CRT is primary and DVI is secondary, we should use:
|
|
modprobe viafb viafb_active_dev=CRT+DVI viafb_SAMM_ON=1...
|
|
If DVI is primary and CRT is secondary, we should use:
|
|
modprobe viafb viafb_active_dev=DVI+CRT viafb_SAMM_ON=1...
|
|
|
|
viafb_display_hardware_layout:
|
|
This option is used to specify display hardware layout for CX700 chip.
|
|
1 : LCD only
|
|
2 : DVI only
|
|
3 : LCD+DVI (default)
|
|
4 : LCD1+LCD2 (internal + internal)
|
|
16: LCD1+ExternalLCD2 (internal + external)
|
|
|
|
viafb_second_size:
|
|
This option is used to set second device memory size(MB) in SAMM case.
|
|
The minimal size is 16.
|
|
|
|
viafb_platform_epia_dvi:
|
|
This option is used to enable DVI on EPIA - M
|
|
0 : No DVI on EPIA - M (default)
|
|
1 : DVI on EPIA - M
|
|
|
|
viafb_bus_width:
|
|
When using 24 - Bit Bus Width Digital Interface,
|
|
this option should be set.
|
|
12: 12-Bit LVDS or 12-Bit TMDS (default)
|
|
24: 24-Bit LVDS or 24-Bit TMDS
|
|
|
|
viafb_device_lcd_dualedge:
|
|
When using Dual Edge Panel, this option should be set.
|
|
0 : No Dual Edge Panel (default)
|
|
1 : Dual Edge Panel
|
|
|
|
viafb_lcd_port:
|
|
This option is used to specify LCD output port,
|
|
available values are "DVP0" "DVP1" "DFP_HIGHLOW" "DFP_HIGH" "DFP_LOW".
|
|
for external LCD + external DVI on CX700(External LCD is on DVP0),
|
|
we should use:
|
|
modprobe viafb viafb_lcd_port=DVP0...
|
|
|
|
Notes:
|
|
1. CRT may not display properly for DuoView CRT & DVI display at
|
|
the "640x480" PAL mode with DVI overscan enabled.
|
|
2. SAMM stands for single adapter multi monitors. It is different from
|
|
multi-head since SAMM support multi monitor at driver layers, thus fbcon
|
|
layer doesn't even know about it; SAMM's second screen doesn't have a
|
|
device node file, thus a user mode application can't access it directly.
|
|
When SAMM is enabled, viafb_mode and viafb_mode1, viafb_bpp and
|
|
viafb_bpp1, viafb_refresh and viafb_refresh1 can be different.
|
|
3. When console is depending on viafbinfo1, dynamically change resolution
|
|
and bpp, need to call VIAFB specified ioctl interface VIAFB_SET_DEVICE
|
|
instead of calling common ioctl function FBIOPUT_VSCREENINFO since
|
|
viafb doesn't support multi-head well, or it will cause screen crush.
|
|
|
|
|
|
[Configure viafb with "fbset" tool]
|
|
-----------------------------------
|
|
"fbset" is an inbox utility of Linux.
|
|
1. Inquire current viafb information, type,
|
|
# fbset -i
|
|
|
|
2. Set various resolutions and viafb_refresh rates,
|
|
# fbset <resolution-vertical_sync>
|
|
|
|
example,
|
|
# fbset "1024x768-75"
|
|
or
|
|
# fbset -g 1024 768 1024 768 32
|
|
Check the file "/etc/fb.modes" to find display modes available.
|
|
|
|
3. Set the color depth,
|
|
# fbset -depth <value>
|
|
|
|
example,
|
|
# fbset -depth 16
|
|
|
|
|
|
[Configure viafb via /proc]
|
|
---------------------------
|
|
The following files exist in /proc/viafb
|
|
|
|
supported_output_devices
|
|
|
|
This read-only file contains a full ',' separated list containing all
|
|
output devices that could be available on your platform. It is likely
|
|
that not all of those have a connector on your hardware but it should
|
|
provide a good starting point to figure out which of those names match
|
|
a real connector.
|
|
Example:
|
|
# cat /proc/viafb/supported_output_devices
|
|
|
|
iga1/output_devices
|
|
iga2/output_devices
|
|
|
|
These two files are readable and writable. iga1 and iga2 are the two
|
|
independent units that produce the screen image. Those images can be
|
|
forwarded to one or more output devices. Reading those files is a way
|
|
to query which output devices are currently used by an iga.
|
|
Example:
|
|
# cat /proc/viafb/iga1/output_devices
|
|
If there are no output devices printed the output of this iga is lost.
|
|
This can happen for example if only one (the other) iga is used.
|
|
Writing to these files allows adjusting the output devices during
|
|
runtime. One can add new devices, remove existing ones or switch
|
|
between igas. Essentially you can write a ',' separated list of device
|
|
names (or a single one) in the same format as the output to those
|
|
files. You can add a '+' or '-' as a prefix allowing simple addition
|
|
and removal of devices. So a prefix '+' adds the devices from your list
|
|
to the already existing ones, '-' removes the listed devices from the
|
|
existing ones and if no prefix is given it replaces all existing ones
|
|
with the listed ones. If you remove devices they are expected to turn
|
|
off. If you add devices that are already part of the other iga they are
|
|
removed there and added to the new one.
|
|
Examples:
|
|
Add CRT as output device to iga1
|
|
# echo +CRT > /proc/viafb/iga1/output_devices
|
|
|
|
Remove (turn off) DVP1 and LVDS1 as output devices of iga2
|
|
# echo -DVP1,LVDS1 > /proc/viafb/iga2/output_devices
|
|
|
|
Replace all iga1 output devices by CRT
|
|
# echo CRT > /proc/viafb/iga1/output_devices
|
|
|
|
|
|
[Bootup with viafb]:
|
|
--------------------
|
|
Add the following line to your grub.conf:
|
|
append = "video=viafb:viafb_mode=1024x768,viafb_bpp=32,viafb_refresh=85"
|
|
|