1 files changed, 17 insertions, 20 deletions

diff --git a/drivers/gpu/drm/radeon/atombios_dp.c b/drivers/gpu/drm/radeon/atombios_dp.c
index 3eb0ca5b3d7..99915a682d5 100644
--- a/drivers/gpu/drm/radeon/atombios_dp.c
+++ b/drivers/gpu/drm/radeon/atombios_dp.c
@@ -332,11 +332,13 @@ bool radeon_process_aux_ch(struct radeon_i2c_chan *chan, u8 *req_bytes,
         PROCESS_AUX_CHANNEL_TRANSACTION_PS_ALLOCATION args;
         int index = GetIndexIntoMasterTable(COMMAND, ProcessAuxChannelTransaction);
         unsigned char *base;
+        int retry_count = 0;
 
         memset(&args, 0, sizeof(args));
 
         base = (unsigned char *)rdev->mode_info.atom_context->scratch;
 
+retry:
         memcpy(base, req_bytes, num_bytes);
 
         args.lpAuxRequest = 0;
@@ -347,10 +349,12 @@ bool radeon_process_aux_ch(struct radeon_i2c_chan *chan, u8 *req_bytes,
 
         atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
 
-        if (args.ucReplyStatus) {
-                DRM_DEBUG("failed to get auxch %02x%02x %02x %02x 0x%02x %02x\n",
+        if (args.ucReplyStatus && !args.ucDataOutLen) {
+                if (args.ucReplyStatus == 0x20 && retry_count++ < 10)
+                        goto retry;
+                DRM_DEBUG("failed to get auxch %02x%02x %02x %02x 0x%02x %02x after %d retries\n",
                           req_bytes[1], req_bytes[0], req_bytes[2], req_bytes[3],
-                          chan->rec.i2c_id, args.ucReplyStatus);
+                          chan->rec.i2c_id, args.ucReplyStatus, retry_count);
                 return false;
         }
 
@@ -468,7 +472,7 @@ void radeon_dp_set_link_config(struct drm_connector *connector,
         struct radeon_connector *radeon_connector;
         struct radeon_connector_atom_dig *dig_connector;
 
-        if ((connector->connector_type != DRM_MODE_CONNECTOR_DisplayPort) ||
+        if ((connector->connector_type != DRM_MODE_CONNECTOR_DisplayPort) &&
             (connector->connector_type != DRM_MODE_CONNECTOR_eDP))
                 return;
 
@@ -583,7 +587,7 @@ void dp_link_train(struct drm_encoder *encoder,
         u8 train_set[4];
         int i;
 
-        if ((connector->connector_type != DRM_MODE_CONNECTOR_DisplayPort) ||
+        if ((connector->connector_type != DRM_MODE_CONNECTOR_DisplayPort) &&
             (connector->connector_type != DRM_MODE_CONNECTOR_eDP))
                 return;
 
@@ -596,21 +600,14 @@ void dp_link_train(struct drm_encoder *encoder,
                 return;
         dig_connector = radeon_connector->con_priv;
 
-        if (ASIC_IS_DCE32(rdev)) {
-                if (dig->dig_block)
-                        enc_id |= ATOM_DP_CONFIG_DIG2_ENCODER;
-                else
-                        enc_id |= ATOM_DP_CONFIG_DIG1_ENCODER;
-                if (dig_connector->linkb)
-                        enc_id |= ATOM_DP_CONFIG_LINK_B;
-                else
-                        enc_id |= ATOM_DP_CONFIG_LINK_A;
-        } else {
-                if (dig_connector->linkb)
-                        enc_id |= ATOM_DP_CONFIG_DIG2_ENCODER | ATOM_DP_CONFIG_LINK_B;
-                else
-                        enc_id |= ATOM_DP_CONFIG_DIG1_ENCODER | ATOM_DP_CONFIG_LINK_A;
-        }
+        if (dig->dig_encoder)
+                enc_id |= ATOM_DP_CONFIG_DIG2_ENCODER;
+        else
+                enc_id |= ATOM_DP_CONFIG_DIG1_ENCODER;
+        if (dig_connector->linkb)
+                enc_id |= ATOM_DP_CONFIG_LINK_B;
+        else
+                enc_id |= ATOM_DP_CONFIG_LINK_A;
 
         memset(link_configuration, 0, DP_LINK_CONFIGURATION_SIZE);
         if (dig_connector->dp_clock == 270000)