drm/amd/display: Fix for null pointer access for ddc pin and aux engine.

[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@amd.com>
Acked-by: Mikita Lipski <mikita.lipski@amd.com>
Signed-off-by: Meenakshikumar Somasundaram <meenakshikumar.somasundaram@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_hdcp.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_hdcp.c
index c5f61be..5bfdc66 100644 (file)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_hdcp.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_hdcp.c
@@ -449,9 +449,7 @@ static void update_config(void *handle, struct cp_psp_stream_config *config)
        struct mod_hdcp_link *link = &hdcp_work[link_index].link;
        struct drm_connector_state *conn_state;
        struct dc_sink *sink = NULL;
-#if defined(CONFIG_DRM_AMD_DC_DCN3_1)
        bool link_is_hdcp14 = false;
-#endif
 
        if (config->dpms_off) {
                hdcp_remove_display(hdcp_work, link_index, aconnector);

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 e14f99b..4a3b94f 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dce/dce_aux.c
+++ b/drivers/gpu/drm/amd/display/dc/dce/dce_aux.c
@@ -689,8 +689,8 @@ 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,
@@ -699,6 +699,11 @@ 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;
@@ -765,7 +770,8 @@ bool dce_aux_transfer_with_retries(struct ddc_service *ddc,
                                                        "dce_aux_transfer_with_retries: AUX_RET_SUCCESS: 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 381c17c..3d2f081 100644 (file)
--- 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