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From: Greg KH on 30 Jul 2010 14:40
2.6.34-stable review patch. If anyone has any objections, please let us know.

------------------

From: Alex Deucher <alexdeucher(a)gmail.com>

commit a5f798ce2b9de4b14c46cb68d58c488dc1b8e215 upstream.

The transmitter needs to be enabled before the link is trained.

Reported-By: Lars Doelle <lars.doelle(a)on-line.de>
Signed-off-by: Alex Deucher <alexdeucher(a)gmail.com>
Signed-off-by: Dave Airlie <airlied(a)redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)suse.de>

---
drivers/gpu/drm/radeon/radeon_encoders.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/radeon/radeon_encoders.c
+++ b/drivers/gpu/drm/radeon/radeon_encoders.c
@@ -1075,6 +1075,8 @@ radeon_atom_encoder_dpms(struct drm_enco
if (is_dig) {
switch (mode) {
case DRM_MODE_DPMS_ON:
+ if (!ASIC_IS_DCE4(rdev))
+ 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);

@@ -1082,8 +1084,6 @@ radeon_atom_encoder_dpms(struct drm_enco
if (ASIC_IS_DCE4(rdev))
atombios_dig_encoder_setup(encoder, ATOM_ENCODER_CMD_DP_VIDEO_ON);
}
- if (!ASIC_IS_DCE4(rdev))
- atombios_dig_transmitter_setup(encoder, ATOM_TRANSMITTER_ACTION_ENABLE_OUTPUT, 0, 0);
break;
case DRM_MODE_DPMS_STANDBY:
case DRM_MODE_DPMS_SUSPEND:


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