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authorDave Airlie <airlied@redhat.com>2010-02-10 01:52:45 -0500
committerDave Airlie <airlied@redhat.com>2010-02-10 23:03:18 -0500
commit648ac05c4f8a8aea908c7dff81ceffe003e28561 (patch)
treef2a8712d7b8c6005bb07266bdc63ad686d0127d7
parentc60a284cc41f9989391706e113d30b4f27dbe3e0 (diff)
drm/radeon/kms: retry auxch on 0x20 timeout value.
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>
-rw-r--r--drivers/gpu/drm/radeon/atombios_dp.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/drivers/gpu/drm/radeon/atombios_dp.c b/drivers/gpu/drm/radeon/atombios_dp.c
index 71060114d5de..b32eeea5bb8b 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,
332 PROCESS_AUX_CHANNEL_TRANSACTION_PS_ALLOCATION args; 332 PROCESS_AUX_CHANNEL_TRANSACTION_PS_ALLOCATION args;
333 int index = GetIndexIntoMasterTable(COMMAND, ProcessAuxChannelTransaction); 333 int index = GetIndexIntoMasterTable(COMMAND, ProcessAuxChannelTransaction);
334 unsigned char *base; 334 unsigned char *base;
335 int retry_count = 0;
335 336
336 memset(&args, 0, sizeof(args)); 337 memset(&args, 0, sizeof(args));
337 338
338 base = (unsigned char *)rdev->mode_info.atom_context->scratch; 339 base = (unsigned char *)rdev->mode_info.atom_context->scratch;
339 340
341retry:
340 memcpy(base, req_bytes, num_bytes); 342 memcpy(base, req_bytes, num_bytes);
341 343
342 args.lpAuxRequest = 0; 344 args.lpAuxRequest = 0;
@@ -347,10 +349,12 @@ bool radeon_process_aux_ch(struct radeon_i2c_chan *chan, u8 *req_bytes,
347 349
348 atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args); 350 atom_execute_table(rdev->mode_info.atom_context, index, (uint32_t *)&args);
349 351
350 if (args.ucReplyStatus) { 352 if (args.ucReplyStatus && !args.ucDataOutLen) {
351 DRM_DEBUG("failed to get auxch %02x%02x %02x %02x 0x%02x %02x\n", 353 if (args.ucReplyStatus == 0x20 && retry_count < 10)
354 goto retry;
355 DRM_DEBUG("failed to get auxch %02x%02x %02x %02x 0x%02x %02x after %d retries\n",
352 req_bytes[1], req_bytes[0], req_bytes[2], req_bytes[3], 356 req_bytes[1], req_bytes[0], req_bytes[2], req_bytes[3],
353 chan->rec.i2c_id, args.ucReplyStatus); 357 chan->rec.i2c_id, args.ucReplyStatus, retry_count);
354 return false; 358 return false;
355 } 359 }
356 360