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drm/amd/display: Do not count I2C DEFERs with AUX DEFERs

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[WHY]
DP 2.0 SCR specifies that
"A DPTX shall distinguish I2C_DEFER|AUX_ACK from AUX_DEFER. AUX retries
due to
I2C_DEFER are not counted as part of minimum 7 retires (sic) upon
AUX_DEFER’s"

Signed-off-by: Wesley Chalmers <Wesley.Chalmers@amd.com>
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Anson Jacob <Anson.Jacob@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Wesley Chalmers
2021-03-29 13:36:35 -04:00
committed by Alex Deucher
parent 1d5b15f77e
commit 95ad72f4ad
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/amd/display/dc/dce/dce_aux.c
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@@ -667,12 +667,13 @@ bool dce_aux_transfer_with_retries(struct ddc_service *ddc,
case AUX_TRANSACTION_REPLY_AUX_DEFER:
/* polling_timeout_period is in us */
defer_time_in_ms += aux110->polling_timeout_period / 1000;
++aux_defer_retries;
/* fall through */
case AUX_TRANSACTION_REPLY_I2C_OVER_AUX_DEFER:
retry_on_defer = true;
fallthrough;
case AUX_TRANSACTION_REPLY_I2C_OVER_AUX_NACK:
if (++aux_defer_retries >= AUX_MIN_DEFER_RETRIES
if (aux_defer_retries >= AUX_MIN_DEFER_RETRIES
&& defer_time_in_ms >= AUX_MAX_DEFER_TIMEOUT_MS) {
goto fail;
} else {