drm/radeon/kms: fix DP after DPMS cycle

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

Reported-By: Lars Doelle <lars.doelle@on-line.de>
Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Cc: stable <stable@kernel.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_encoders.c b/drivers/gpu/drm/radeon/radeon_encoders.c
index 1ebb100015b7..e0b30b264c28 100644
--- a/drivers/gpu/drm/radeon/radeon_encoders.c
+++ b/drivers/gpu/drm/radeon/radeon_encoders.c
@@ -1072,6 +1072,8 @@ radeon_atom_encoder_dpms(struct drm_encoder *encoder, int mode)
         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);
 
@@ -1079,8 +1081,6 @@ radeon_atom_encoder_dpms(struct drm_encoder *encoder, int mode)
                                 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: