diff options
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/core/dc_link.c | 6 | ||||
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 14 | ||||
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/dc_dp_types.h | 1 |
3 files changed, 18 insertions, 3 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link.c b/drivers/gpu/drm/amd/display/dc/core/dc_link.c index 655b48c5ef37..f68a0d9543f4 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c @@ -1665,6 +1665,12 @@ struct dc_link *link_create(const struct link_init_data *init_params) if (false == dc_link_construct(link, init_params)) goto construct_fail; + /* + * Must use preferred_link_setting, not reported_link_cap or verified_link_cap, + * since struct preferred_link_setting won't be reset after S3. + */ + link->preferred_link_setting.dpcd_source_device_specific_field_support = true; + return link; construct_fail: diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c index 335018f0f0c3..fba38d8bd316 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c @@ -4784,10 +4784,18 @@ void dpcd_set_source_specific_data(struct dc_link *link) uint8_t hblank_size = (uint8_t)link->dc->caps.min_horizontal_blanking_period; - result_write_min_hblank = core_link_write_dpcd(link, - DP_SOURCE_MINIMUM_HBLANK_SUPPORTED, (uint8_t *)(&hblank_size), - sizeof(hblank_size)); + if (link->preferred_link_setting.dpcd_source_device_specific_field_support) { + result_write_min_hblank = core_link_write_dpcd(link, + DP_SOURCE_MINIMUM_HBLANK_SUPPORTED, (uint8_t *)(&hblank_size), + sizeof(hblank_size)); + + if (result_write_min_hblank == DC_ERROR_UNEXPECTED) + link->preferred_link_setting.dpcd_source_device_specific_field_support = false; + } else { + DC_LOG_DC("Sink device does not support 00340h DPCD write. Skipping on purpose.\n"); + } } + DC_TRACE_LEVEL_MESSAGE(DAL_TRACE_LEVEL_INFORMATION, WPP_BIT_FLAG_DC_DETECTION_DP_CAPS, "result=%u link_index=%u enum dce_version=%d DPCD=0x%04X min_hblank=%u branch_dev_id=0x%x branch_dev_name='%c%c%c%c%c%c'", diff --git a/drivers/gpu/drm/amd/display/dc/dc_dp_types.h b/drivers/gpu/drm/amd/display/dc/dc_dp_types.h index 1948cd9427d7..4f54bde1bb1c 100644 --- a/drivers/gpu/drm/amd/display/dc/dc_dp_types.h +++ b/drivers/gpu/drm/amd/display/dc/dc_dp_types.h @@ -109,6 +109,7 @@ struct dc_link_settings { enum dc_link_spread link_spread; bool use_link_rate_set; uint8_t link_rate_set; + bool dpcd_source_device_specific_field_support; }; struct dc_lane_settings { |