drm/amd/display: add DalEnableHDMI20 key support

[why]
"DalEnableHDMI20" set to 0, disallow HDMI YCbCr420 and  pixel clock > 340Mhz
Default is enabled.

Signed-off-by: Charlene Liu <charlene.liu@amd.com>
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/display/dc/dc.h b/drivers/gpu/drm/amd/display/dc/dc.h
index ede3489..721c5cd 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dc.h
+++ b/drivers/gpu/drm/amd/display/dc/dc.h
@@ -251,6 +251,7 @@ struct dc_debug {
        bool recovery_enabled;
        bool avoid_vbios_exec_table;
        bool scl_reset_length10;
+       bool hdmi20_disable;
 
 };
 struct dc_state;

diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_link_encoder.c b/drivers/gpu/drm/amd/display/dc/dce/dce_link_encoder.c
index dbe3b26..60e3c6a 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dce/dce_link_encoder.c
+++ b/drivers/gpu/drm/amd/display/dc/dce/dce_link_encoder.c
@@ -646,6 +646,9 @@ static bool dce110_link_encoder_validate_hdmi_output(
        if (!enc110->base.features.flags.bits.HDMI_6GB_EN &&
                adjusted_pix_clk_khz >= 300000)
                return false;
+       if (enc110->base.ctx->dc->debug.hdmi20_disable &&
+               crtc_timing->pixel_encoding == PIXEL_ENCODING_YCBCR420)
+               return false;
        return true;
 }
 
@@ -773,6 +776,9 @@ void dce110_link_encoder_construct(
                                __func__,
                                result);
        }
+       if (enc110->base.ctx->dc->debug.hdmi20_disable) {
+               enc110->base.features.flags.bits.HDMI_6GB_EN = 0;
+       }
 }
 
 bool dce110_link_encoder_validate_output_with_stream(

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 be78ccb..6f67520 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
@@ -596,6 +596,9 @@ static bool dcn10_link_encoder_validate_hdmi_output(
        if (!enc10->base.features.flags.bits.HDMI_6GB_EN &&
                adjusted_pix_clk_khz >= 300000)
                return false;
+       if (enc10->base.ctx->dc->debug.hdmi20_disable &&
+               crtc_timing->pixel_encoding == PIXEL_ENCODING_YCBCR420)
+               return false;
        return true;
 }
 
@@ -728,6 +731,9 @@ void dcn10_link_encoder_construct(
                                __func__,
                                result);
        }
+       if (enc10->base.ctx->dc->debug.hdmi20_disable) {
+               enc10->base.features.flags.bits.HDMI_6GB_EN = 0;
+       }
 }
 
 bool dcn10_link_encoder_validate_output_with_stream(