drm/amd/display: Fix exception from AUX acquire failure

[Why]
AUX arbitration occurs between SW and FW components.
When AUX acquire fails, it causes engine->ddc to be NULL,
which leads to an exception when we try to release the AUX
engine.

[How]
When AUX engine acquire fails, it should return from the
function without trying to continue the operation.
The upper level will determine if it wants to retry.
i.e. dce_aux_transfer_with_retries will be used and retry.

Signed-off-by: Anthony Koo <Anthony.Koo@amd.com>
Reviewed-by: Aric Cyr <Aric.Cyr@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_aux.c b/drivers/gpu/drm/amd/display/dc/dce/dce_aux.c
index 4febf4ef7240e6aef2610063b55f3aee636bbca0..2f50be33ab154882ae77aa8c47b33b345547977a 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dce/dce_aux.c
+++ b/drivers/gpu/drm/amd/display/dc/dce/dce_aux.c
@@ -374,7 +374,6 @@ static bool acquire(
        struct dce_aux *engine,
        struct ddc *ddc)
 {
-
        enum gpio_result result;
 
        if (!is_engine_available(engine))
@@ -455,7 +454,8 @@ int dce_aux_transfer(struct ddc_service *ddc,
        memset(&aux_rep, 0, sizeof(aux_rep));
 
        aux_engine = ddc->ctx->dc->res_pool->engines[ddc_pin->pin_data->en];
-       acquire(aux_engine, ddc_pin);
+       if (!acquire(aux_engine, ddc_pin))
+               return -1;
 
        if (payload->i2c_over_aux)
                aux_req.type = AUX_TRANSACTION_TYPE_I2C;