From: Relja Vojvodic <[email protected]> Fix the HDMI data channel reads to respect scdc_present field to pass compliance test.
Reviewed-by: Wenjing Liu <[email protected]> Signed-off-by: Relja Vojvodic <[email protected]> Signed-off-by: Aurabindo Pillai <[email protected]> --- drivers/gpu/drm/amd/display/dc/dc_types.h | 1 + drivers/gpu/drm/amd/display/dc/link/link_detection.c | 4 ++++ drivers/gpu/drm/amd/display/dc/link/protocols/link_ddc.c | 3 ++- 3 files changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/amd/display/dc/dc_types.h b/drivers/gpu/drm/amd/display/dc/dc_types.h index b5aa03a3e39c..8f8ccde7ad94 100644 --- a/drivers/gpu/drm/amd/display/dc/dc_types.h +++ b/drivers/gpu/drm/amd/display/dc/dc_types.h @@ -212,6 +212,7 @@ struct dc_edid_caps { bool edid_hdmi; bool hdr_supported; bool rr_capable; + bool scdc_present; struct dc_panel_patch panel_patch; }; diff --git a/drivers/gpu/drm/amd/display/dc/link/link_detection.c b/drivers/gpu/drm/amd/display/dc/link/link_detection.c index 85303167a553..82a9e52d5ae5 100644 --- a/drivers/gpu/drm/amd/display/dc/link/link_detection.c +++ b/drivers/gpu/drm/amd/display/dc/link/link_detection.c @@ -270,6 +270,10 @@ static void read_scdc_caps(struct ddc_service *ddc_service, uint8_t slave_address = HDMI_SCDC_ADDRESS; uint8_t offset = HDMI_SCDC_MANUFACTURER_OUI; + if (ddc_service->link->local_sink && + !ddc_service->link->local_sink->edid_caps.scdc_present) + return; + link_query_ddc_data(ddc_service, slave_address, &offset, sizeof(offset), sink->scdc_caps.manufacturer_OUI.byte, sizeof(sink->scdc_caps.manufacturer_OUI.byte)); diff --git a/drivers/gpu/drm/amd/display/dc/link/protocols/link_ddc.c b/drivers/gpu/drm/amd/display/dc/link/protocols/link_ddc.c index 267180e7bc48..5d2bcce2f669 100644 --- a/drivers/gpu/drm/amd/display/dc/link/protocols/link_ddc.c +++ b/drivers/gpu/drm/amd/display/dc/link/protocols/link_ddc.c @@ -549,7 +549,8 @@ void write_scdc_data(struct ddc_service *ddc_service, /*Lower than 340 Scramble bit from SCDC caps*/ if (ddc_service->link->local_sink && - ddc_service->link->local_sink->edid_caps.panel_patch.skip_scdc_overwrite) + (ddc_service->link->local_sink->edid_caps.panel_patch.skip_scdc_overwrite || + !ddc_service->link->local_sink->edid_caps.scdc_present)) return; link_query_ddc_data(ddc_service, slave_address, &offset, -- 2.51.0
