From: Alex Deucher <alexander.deuc...@amd.com>
DVOOutputControl checks the value of of bios scratch reg 3
on some tables and assumes the encoder is already enabled
if the DFP2_ACTIVE bit is set. Clear that bit so the table
sets the DDIA enable bit properly.
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
Cc: stable at kernel.org
---
drivers/gpu/drm/radeon/radeon_encoders.c | 9 ++++++++-
1 files changed, 8 insertions(+), 1 deletions(-)
diff --git a/drivers/gpu/drm/radeon/radeon_encoders.c
b/drivers/gpu/drm/radeon/radeon_encoders.c
index 9c1fdb2..2554fe3 100644
--- a/drivers/gpu/drm/radeon/radeon_encoders.c
+++ b/drivers/gpu/drm/radeon/radeon_encoders.c
@@ -1505,7 +1505,14 @@ radeon_atom_encoder_dpms(struct drm_encoder *encoder,
int mode)
switch (mode) {
case DRM_MODE_DPMS_ON:
args.ucAction = ATOM_ENABLE;
- atom_execute_table(rdev->mode_info.atom_context, index,
(uint32_t *)&args);
+ /* workaround for DVOOutputControl on some RS690
systems */
+ if (radeon_encoder->encoder_id ==
ENCODER_OBJECT_ID_INTERNAL_DDI) {
+ u32 reg = RREG32(RADEON_BIOS_3_SCRATCH);
+ WREG32(RADEON_BIOS_3_SCRATCH, reg &
~ATOM_S3_DFP2I_ACTIVE);
+
atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
+ WREG32(RADEON_BIOS_3_SCRATCH, reg);
+ } else
+
atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
if (radeon_encoder->devices &
(ATOM_DEVICE_LCD_SUPPORT)) {
args.ucAction = ATOM_LCD_BLON;
atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
--
1.7.1.1
