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 ------------------------------------------------------------------------------ SOLARIS 10 is the OS for Data Centers - provides features such as DTrace, Predictive Self Healing and Award Winning ZFS. Get Solaris 10 NOW http://p.sf.net/sfu/solaris-dev2dev -- _______________________________________________ Dri-devel mailing list Dri-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/dri-devel