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drm/radeon/kms: retry auxch on 0x20 timeout value.

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ATOM appears to return 0x20 which seems to mean some sort of timeout.

retry the transaction up to 10 times before failing, this
makes DP->VGA convertor we bought work at least a bit more predictably.

Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Dave Airlie
2010-02-10 16:52:45 +10:00
parent c60a284cc4
commit 648ac05c4f
1 changed files with 7 additions and 3 deletions
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drivers/gpu/drm/radeon/atombios_dp.c
+7 -3
View 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;
}