From 13900e6fde3f91ea34a586002d592a2b20e1142e Mon Sep 17 00:00:00 2001 From: Meenakshikumar Somasundaram Date: Fri, 13 Aug 2021 13:09:25 -0400 Subject: [PATCH] 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 Acked-by: Mikita Lipski Signed-off-by: Meenakshikumar Somasundaram Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_hdcp.c | 2 -- drivers/gpu/drm/amd/display/dc/dce/dce_aux.c | 12 +++++++++--- drivers/gpu/drm/amd/display/include/dal_asic_id.h | 2 +- 3 files changed, 10 insertions(+), 6 deletions(-) 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 --- 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 --- 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 --- 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 -- 2.7.4