From a1cae4e31f769e95aaafb9b98357a70d499fa362 Mon Sep 17 00:00:00 2001 From: Harry Wentland Date: Tue, 24 Apr 2018 10:49:20 -0400 Subject: [PATCH 4365/5725] drm/amd/display: Don't return ddc result and read_bytes in same return value The two ranges overlap. Signed-off-by: Harry Wentland Acked-by: Alex Deucher --- .../drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c | 20 ++++++++++++-------- drivers/gpu/drm/amd/display/dc/core/dc_link_ddc.c | 10 +++++++--- drivers/gpu/drm/amd/display/dc/inc/dc_link_ddc.h | 5 +++-- 3 files changed, 22 insertions(+), 13 deletions(-) diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c index e3110d6..559bd2a 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c @@ -82,21 +82,22 @@ static ssize_t dm_dp_aux_transfer(struct drm_dp_aux *aux, enum i2c_mot_mode mot = (msg->request & DP_AUX_I2C_MOT) ? I2C_MOT_TRUE : I2C_MOT_FALSE; enum ddc_result res; - ssize_t read_bytes; + uint32_t read_bytes = msg->size; if (WARN_ON(msg->size > 16)) return -E2BIG; switch (msg->request & ~DP_AUX_I2C_MOT) { case DP_AUX_NATIVE_READ: - read_bytes = dal_ddc_service_read_dpcd_data( + res = dal_ddc_service_read_dpcd_data( TO_DM_AUX(aux)->ddc_service, false, I2C_MOT_UNDEF, msg->address, msg->buffer, - msg->size); - return read_bytes; + msg->size, + &read_bytes); + break; case DP_AUX_NATIVE_WRITE: res = dal_ddc_service_write_dpcd_data( TO_DM_AUX(aux)->ddc_service, @@ -107,14 +108,15 @@ static ssize_t dm_dp_aux_transfer(struct drm_dp_aux *aux, msg->size); break; case DP_AUX_I2C_READ: - read_bytes = dal_ddc_service_read_dpcd_data( + res = dal_ddc_service_read_dpcd_data( TO_DM_AUX(aux)->ddc_service, true, mot, msg->address, msg->buffer, - msg->size); - return read_bytes; + msg->size, + &read_bytes); + break; case DP_AUX_I2C_WRITE: res = dal_ddc_service_write_dpcd_data( TO_DM_AUX(aux)->ddc_service, @@ -136,7 +138,9 @@ static ssize_t dm_dp_aux_transfer(struct drm_dp_aux *aux, r == DDC_RESULT_SUCESSFULL); #endif - return msg->size; + if (res != DDC_RESULT_SUCESSFULL) + return -EIO; + return read_bytes; } static enum drm_connector_status diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_ddc.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_ddc.c index 49c2fac..ae48d60 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_link_ddc.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_ddc.c @@ -629,13 +629,14 @@ bool dal_ddc_service_query_ddc_data( return ret; } -ssize_t dal_ddc_service_read_dpcd_data( +enum ddc_result dal_ddc_service_read_dpcd_data( struct ddc_service *ddc, bool i2c, enum i2c_mot_mode mot, uint32_t address, uint8_t *data, - uint32_t len) + uint32_t len, + uint32_t *read) { struct aux_payload read_payload = { .i2c_over_aux = i2c, @@ -652,6 +653,8 @@ ssize_t dal_ddc_service_read_dpcd_data( .mot = mot }; + *read = 0; + if (len > DEFAULT_AUX_MAX_DATA_SIZE) { BREAK_TO_DEBUGGER(); return DDC_RESULT_FAILED_INVALID_OPERATION; @@ -661,7 +664,8 @@ ssize_t dal_ddc_service_read_dpcd_data( ddc->ctx->i2caux, ddc->ddc_pin, &command)) { - return (ssize_t)command.payloads->length; + *read = command.payloads->length; + return DDC_RESULT_SUCESSFULL; } return DDC_RESULT_FAILED_OPERATION; diff --git a/drivers/gpu/drm/amd/display/dc/inc/dc_link_ddc.h b/drivers/gpu/drm/amd/display/dc/inc/dc_link_ddc.h index 090b7a8..30b3a08 100644 --- a/drivers/gpu/drm/amd/display/dc/inc/dc_link_ddc.h +++ b/drivers/gpu/drm/amd/display/dc/inc/dc_link_ddc.h @@ -102,13 +102,14 @@ bool dal_ddc_service_query_ddc_data( uint8_t *read_buf, uint32_t read_size); -ssize_t dal_ddc_service_read_dpcd_data( +enum ddc_result dal_ddc_service_read_dpcd_data( struct ddc_service *ddc, bool i2c, enum i2c_mot_mode mot, uint32_t address, uint8_t *data, - uint32_t len); + uint32_t len, + uint32_t *read); enum ddc_result dal_ddc_service_write_dpcd_data( struct ddc_service *ddc, -- 2.7.4