From: Dave Airlie <airl...@redhat.com>
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 <airl...@redhat.com>
---
drivers/gpu/drm/radeon/atombios_dp.c | 8 ++++++--
1 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/radeon/atombios_dp.c
b/drivers/gpu/drm/radeon/atombios_dp.c
index 0b6f2ce..a85069e 100644
--- a/drivers/gpu/drm/radeon/atombios_dp.c
+++ b/drivers/gpu/drm/radeon/atombios_dp.c
@@ -336,11 +336,13 @@ bool radeon_process_aux_ch(struct radeon_i2c_chan *chan,
u8 *req_bytes,
union aux_channel_transaction 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.v1.lpAuxRequest = 0;
@@ -354,9 +356,11 @@ 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.v1.ucReplyStatus) {
- DRM_DEBUG("failed to get auxch %02x%02x %02x %02x 0x%02x
%02x\n",
+ if (args.v1.ucReplyStatus == 0x20 && retry_count++ < 10)
+ goto retry;
+ DRM_DEBUG("failed to get auxch %02x%02x %02x %02x 0x%02x %02x
after %d\n",
req_bytes[1], req_bytes[0], req_bytes[2],
req_bytes[3],
- chan->rec.i2c_id, args.v1.ucReplyStatus);
+ chan->rec.i2c_id, args.v1.ucReplyStatus, retry_count);
return false;
}
--
1.6.5.2
------------------------------------------------------------------------------
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