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drm/amd/display: add monitor patch to disable SCDC read/write

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[why]
customer issue: found that for their specific panel, EDID register space
being overwritten during SCDC read write

[how]
customer accepted HDMI 2 features not working - disabled SCDC read/write
as well as HDMI 2 in general based on monitor patch

Signed-off-by: Martin Leung <martin.leung@amd.com>
Reviewed-by: Chris Park <Chris.Park@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Martin Leung 2020-01-30 18:54:44 -05:00 committed by Alex Deucher
parent 5bf24270d1
commit a760fc1bff
4 changed files with 18 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
drivers/gpu/drm/amd/display/dc/core/dc_link.c
View file

@ -977,6 +977,10 @@ static bool dc_link_detect_helper(struct dc_link *link,
if ((prev_sink != NULL) && ((edid_status == EDID_THE_SAME) || (edid_status == EDID_OK)))
same_edid = is_same_edid(&prev_sink->dc_edid, &sink->dc_edid);
if (&sink->edid_caps.panel_patch.skip_scdc_overwrite)
link->ctx->dc->debug.hdmi20_disable = true;
if (link->connector_signal == SIGNAL_TYPE_DISPLAY_PORT &&
sink_caps.transaction_type == DDC_TRANSACTION_TYPE_I2C_OVER_AUX) {
/*

8
drivers/gpu/drm/amd/display/dc/core/dc_link_ddc.c
View file

@ -686,6 +686,10 @@ void dal_ddc_service_write_scdc_data(struct ddc_service *ddc_service,
uint8_t write_buffer[2] = {0};
/*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)
return;
dal_ddc_service_query_ddc_data(ddc_service, slave_address, &offset,
sizeof(offset), &sink_version, sizeof(sink_version));
if (sink_version == 1) {
@ -715,6 +719,10 @@ void dal_ddc_service_read_scdc_data(struct ddc_service *ddc_service)
uint8_t offset = HDMI_SCDC_TMDS_CONFIG;
uint8_t tmds_config = 0;
if (ddc_service->link->local_sink &&
ddc_service->link->local_sink->edid_caps.panel_patch.skip_scdc_overwrite)
return;
dal_ddc_service_query_ddc_data(ddc_service, slave_address, &offset,
sizeof(offset), &tmds_config, sizeof(tmds_config));
if (tmds_config & 0x1) {

1
drivers/gpu/drm/amd/display/dc/dc_types.h
View file

@ -229,6 +229,7 @@ struct dc_panel_patch {
unsigned int extra_t12_ms;
unsigned int extra_delay_backlight_off;
unsigned int extra_t7_ms;
unsigned int skip_scdc_overwrite;
};
struct dc_edid_caps {

5
drivers/gpu/drm/amd/display/dc/dcn10/dcn10_link_encoder.c
View file

@ -782,6 +782,11 @@ bool dcn10_link_encoder_validate_output_with_stream(
struct dcn10_link_encoder *enc10 = TO_DCN10_LINK_ENC(enc);
bool is_valid;
//if SCDC (340-600MHz) is disabled, set to HDMI 1.4 timing limit
if (stream->sink->edid_caps.panel_patch.skip_scdc_overwrite &&
enc10->base.features.max_hdmi_pixel_clock > 300000)
enc10->base.features.max_hdmi_pixel_clock = 300000;
switch (stream->signal) {
case SIGNAL_TYPE_DVI_SINGLE_LINK:
case SIGNAL_TYPE_DVI_DUAL_LINK: