From: Meenakshikumar Somasundaram <meenakshikumar.somasundaram@xxxxxxx>
[Why]
Need a check for NULL pointer access for ddc pin and aux engine.
[How]
Adding a check for ddc pin and aux engine accesses.
Reviewed-by: Jimmy Kizito <jimmy.kizito@xxxxxxx>
Acked-by: Mikita Lipski <mikita.lipski@xxxxxxx>
Signed-off-by: Meenakshikumar Somasundaram <meenakshikumar.somasundaram@xxxxxxx>
---
drivers/gpu/drm/amd/display/dc/dce/dce_aux.c | 12 +++++++++---
drivers/gpu/drm/amd/display/include/dal_asic_id.h | 2 +-
2 files changed, 10 insertions(+), 4 deletions(-)
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 2fb88e54a4bf..a75487ed1bb6 100644
--- a/drivers/gpu/drm/amd/display/dc/dce/dce_aux.c
+++ b/drivers/gpu/drm/amd/display/dc/dce/dce_aux.c
@@ -630,8 +630,8 @@ bool dce_aux_transfer_with_retries(struct ddc_service *ddc,
enum aux_return_code_type operation_result;
bool retry_on_defer = false;
struct ddc *ddc_pin = ddc->ddc_pin;
- struct dce_aux *aux_engine = ddc->ctx->dc->res_pool->engines[ddc_pin->pin_data->en];
- struct aux_engine_dce110 *aux110 = FROM_AUX_ENGINE(aux_engine);
+ struct dce_aux *aux_engine = NULL;
+ struct aux_engine_dce110 *aux110 = NULL;
uint32_t defer_time_in_ms = 0;
int aux_ack_retries = 0,
@@ -640,6 +640,11 @@ bool dce_aux_transfer_with_retries(struct ddc_service *ddc,
aux_timeout_retries = 0,
aux_invalid_reply_retries = 0;
+ if (ddc_pin) {
+ aux_engine = ddc->ctx->dc->res_pool->engines[ddc_pin->pin_data->en];
+ aux110 = FROM_AUX_ENGINE(aux_engine);
+ }
+
if (!payload->reply) {
payload_reply = false;
payload->reply = &reply;
@@ -666,7 +671,8 @@ 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;
+ if (aux110)
+ defer_time_in_ms += aux110->polling_timeout_period / 1000;
++aux_defer_retries;
fallthrough;
case AUX_TRANSACTION_REPLY_I2C_OVER_AUX_DEFER:
diff --git a/drivers/gpu/drm/amd/display/include/dal_asic_id.h b/drivers/gpu/drm/amd/display/include/dal_asic_id.h
index 381c17caace1..3d2f0817e40a 100644
--- a/drivers/gpu/drm/amd/display/include/dal_asic_id.h
+++ b/drivers/gpu/drm/amd/display/include/dal_asic_id.h
@@ -227,7 +227,7 @@ enum {
#define FAMILY_YELLOW_CARP 146
#define YELLOW_CARP_A0 0x01
-#define YELLOW_CARP_B0 0x02 // TODO: DCN31 - update with correct B0 ID
+#define YELLOW_CARP_B0 0x20
#define YELLOW_CARP_UNKNOWN 0xFF
#ifndef ASICREV_IS_YELLOW_CARP
--
2.25.1
