drm/radeon/kms: retry auxch on 0x20 timeout value.
[sfrench/cifs-2.6.git] / drivers / gpu / drm / radeon / atombios_dp.c
index 71060114d5deea4bf77293730dfae6ff63934495..b32eeea5bb8b24796318ab165712e39afbcfc3ef 100644 (file)
@@ -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;
        }