unimore/kernel-hacking-2024-linux-steffo
unimore/kernel-hacking-2024-linux-steffo
1
Fork 0
Code Pull requests 5 Wiki Activity

drm/radeon/kms/atom: fix duallink on some early DCE3.2 cards

Browse source 
Certain revisions of the vbios on DCE3.2 cards have a bug
in the transmitter control table which prevents duallink from
being enabled properly on some cards.  The action switch statement
jumps to the wrong offset for the OUTPUT_ENABLE action.  The fix
is to use the ENABLE action rather than the OUTPUT_ENABLE action
on the affected cards.  In fixed version of the vbios, both
actions jump to the same offset, so the change should be safe.

Reported-and-tested-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Cc: stable@kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Alex Deucher 2011-06-17 13:13:52 -04:00 committed by Dave Airlie
parent de505e709f
commit 8323fa6ba3
1 changed files with 5 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
drivers/gpu/drm/radeon/radeon_encoders.c
View file

@ -1431,7 +1431,11 @@ radeon_atom_encoder_dpms(struct drm_encoder *encoder, int mode)
if (is_dig) {
switch (mode) {
case DRM_MODE_DPMS_ON:
atombios_dig_transmitter_setup(encoder, ATOM_TRANSMITTER_ACTION_ENABLE_OUTPUT, 0, 0);
/* some early dce3.2 boards have a bug in their transmitter control table */
if ((rdev->family == CHIP_RV710) || (rdev->family == CHIP_RV730))
atombios_dig_transmitter_setup(encoder, ATOM_TRANSMITTER_ACTION_ENABLE, 0, 0);
else
atombios_dig_transmitter_setup(encoder, ATOM_TRANSMITTER_ACTION_ENABLE_OUTPUT, 0, 0);
if (atombios_get_encoder_mode(encoder) == ATOM_ENCODER_MODE_DP) {
struct drm_connector *connector = radeon_get_connector_for_encoder(encoder);