leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

drm/radeon/atom: workaround vbios bug in transmitter table on rs880 (v2)

Browse Source 
The OUTPUT_ENABLE action jumps past the point in the coder where
the data_offset is set on certain rs780 cards.  This worked
previously because the OUTPUT_ENABLE action is always called
immediately after the ENABLE action so the data_offset remained
set.  In 6f8bbaf568
(drm/radeon/atom: initialize more atom interpretor elements to 0),
we explictly reset data_offset to 0 between atom calls which then
caused this to fail.  The fix is to just skip calling the
OUTPUT_ENABLE action on the problematic chipsets.  The ENABLE
action does the same thing and more.  Ultimately, we could
probably drop the OUTPUT_ENABLE action all together on DCE3
asics.

fixes:
https://bugzilla.kernel.org/show_bug.cgi?id=60791

v2: only rs880 seems to be affected

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Alex Deucher 2013-09-09 10:54:22 -04:00
parent 84f3d9f7b4
commit 91f3a6aaf2
1 changed files with 6 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/gpu/drm/radeon/atombios_encoders.c
View File

@ -1650,8 +1650,12 @@ radeon_atom_encoder_dpms_dig(struct drm_encoder *encoder, int mode)
atombios_dig_encoder_setup(encoder, ATOM_ENABLE, 0);
atombios_dig_transmitter_setup(encoder, ATOM_TRANSMITTER_ACTION_SETUP, 0, 0);
atombios_dig_transmitter_setup(encoder, ATOM_TRANSMITTER_ACTION_ENABLE, 0, 0);
/* some early dce3.2 boards have a bug in their transmitter control table */
if ((rdev->family != CHIP_RV710) && (rdev->family != CHIP_RV730))
/* some dce3.x boards have a bug in their transmitter control table.
* ACTION_ENABLE_OUTPUT can probably be dropped since ACTION_ENABLE
* does the same thing and more.
*/
if ((rdev->family != CHIP_RV710) && (rdev->family != CHIP_RV730) &&
(rdev->family != CHIP_RS880))
atombios_dig_transmitter_setup(encoder, ATOM_TRANSMITTER_ACTION_ENABLE_OUTPUT, 0, 0);
}
if (ENCODER_MODE_IS_DP(atombios_get_encoder_mode(encoder)) && connector) {