On Wed, Feb 10, 2010 at 1:45 AM, Dave Airlie <[email protected]> wrote:
> From: Dave Airlie <[email protected]>
>
> 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 <[email protected]>
> ---
> 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)
If ucDataOutLen is 0, the ucReplyStatus codes are as follows:
0 - success
1 - timeout
2 - status flags not zero
3 - fail (no ack)
if ucDataOutLen is non-zero (reply byte count), ucReplyStatus is the
current value in the aux transaction buffer.
So, the retry logic should be something like:
if (ucDataOutLen || (ucReplyStatus != 3))
goto retry;
Alex
> + 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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