drm/amd/display: implement edid max TMDS clock check in DC

[WHY]
Currently DC doesn't check requested pixel clock against an EDID
specified TMDS max clock if it exists, passing modes that should fail

[HOW]
Add max TMDS clk to edid caps and perform check during validation

Signed-off-by: Michael Strauss <michael.strauss@amd.com>
Reviewed-by: Eric Yang <eric.yang2@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/display/dc/dc_types.h b/drivers/gpu/drm/amd/display/dc/dc_types.h
index d7b9d31..f51e576 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dc_types.h
+++ b/drivers/gpu/drm/amd/display/dc/dc_types.h
@@ -261,6 +261,9 @@ struct dc_edid_caps {
        bool edid_hdmi;
        bool hdr_supported;
 
+       uint32_t max_tmds_clk_mhz;
+       uint32_t max_forum_tmds_clk_mhz;
+
        struct dc_panel_patch panel_patch;
 };
 

diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_link_encoder.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_link_encoder.c
index 7fd385b..a9af3f6 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_link_encoder.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_link_encoder.c
@@ -619,11 +619,20 @@ bool dcn10_link_encoder_validate_dvi_output(
 static bool dcn10_link_encoder_validate_hdmi_output(
        const struct dcn10_link_encoder *enc10,
        const struct dc_crtc_timing *crtc_timing,
+       const struct dc_edid_caps *edid_caps,
        int adjusted_pix_clk_100hz)
 {
        enum dc_color_depth max_deep_color =
                        enc10->base.features.max_hdmi_deep_color;
 
+       // check pixel clock against edid specified max TMDS clk
+       if (edid_caps->max_tmds_clk_mhz != 0 &&
+                       adjusted_pix_clk_100hz > edid_caps->max_tmds_clk_mhz * 10000)
+               return false;
+       if (edid_caps->max_forum_tmds_clk_mhz != 0 &&
+                       adjusted_pix_clk_100hz > edid_caps->max_forum_tmds_clk_mhz * 10000)
+               return false;
+
        if (max_deep_color < crtc_timing->display_color_depth)
                return false;
 
@@ -801,6 +810,7 @@ bool dcn10_link_encoder_validate_output_with_stream(
                is_valid = dcn10_link_encoder_validate_hdmi_output(
                                enc10,
                                &stream->timing,
+                               &stream->sink->edid_caps,
                                stream->phy_pix_clk * 10);
        break;
        case SIGNAL_TYPE_DISPLAY_PORT: