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authorLinus Torvalds <torvalds@linux-foundation.org>2010-10-27 19:02:41 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-10-27 19:02:41 -0700
commit9ae6d039224def926656206725ae6e89d1331417 (patch)
tree8ebee863f61da7d095575ca7ef17812d3952389c /Documentation
parentbdab225015fbbb45ccd8913f5d7c01b2bf67d8b2 (diff)
parent51f4332bb5fef869e8a89895a7bac6b4c03b4946 (diff)
Merge branch 'viafb-next' of git://github.com/schandinat/linux-2.6
* 'viafb-next' of git://github.com/schandinat/linux-2.6: (29 commits) viafb: add initial VX900 support viafb: fix hardware acceleration for suspend & resume viafb: make suspend and resume work (on all machines?) viafb: restore display on resume Minimal support for viafb suspend/resume viafb: use proper register for colour when doing fill ops viafb: add documentation for proc interface viafb: rename output devices viafb: add a mapping of supported output devices viafb: set sync polarity for all output devices viafb: add function to change sync polarity per device viafb: reduce I2C timeout and delay viafb: enable I2C for CRT viafb: fix i2c_transfer error handling viafb: vt1636 cleanup viafb: introduce per output device power management viafb: limit LCD code impact viafb: add interface for output device configuration viafb: merge the remaining output path with enable functions viafb: use new device routing ...
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/fb/viafb.txt48
1 files changed, 48 insertions, 0 deletions
diff --git a/Documentation/fb/viafb.txt b/Documentation/fb/viafb.txt
index f3e046a6a98..1a2e8aa3fbb 100644
--- a/Documentation/fb/viafb.txt
+++ b/Documentation/fb/viafb.txt
@@ -197,6 +197,54 @@ Notes:
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 ',' seperated 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 ',' seperated 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: