drm/amd/display: Add DSC 422Native debug option

[Why]
Need to be able to enable native 422 for debugging purposes.

[How]
Add new dc_debug_options bool and check it in the get_dsc_enc_caps
function.
Signed-off-by: Ilya Bakoulin <Ilya.Bakoulin@amd.com>
Reviewed-by: Charlene Liu <Charlene.Liu@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dc.h

@@ -362,6 +362,7 @@ struct dc_debug_options {
 	bool disable_hubp_power_gate;
 	bool disable_dsc_power_gate;
 	int dsc_min_slice_height_override;
+	bool native422_support;
 	bool disable_pplib_wm_range;
 	enum wm_report_mode pplib_wm_report_mode;
 	unsigned int min_disp_clk_khz;

drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c

@@ -25,6 +25,7 @@
 #include "dc_hw_types.h"
 #include "dsc.h"
 #include <drm/drm_dp_helper.h>
+#include "dc.h"
 
 struct dc_dsc_policy {
 	bool use_min_slices_h;
@@ -236,8 +237,11 @@ static void get_dsc_enc_caps(
 	// This is a static HW query, so we can use any DSC
 
 	memset(dsc_enc_caps, 0, sizeof(struct dsc_enc_caps));
-	if (dsc)
+	if (dsc) {
 		dsc->funcs->dsc_get_enc_caps(dsc_enc_caps, pixel_clock_100Hz);
+		if (dsc->ctx->dc->debug.native422_support)
+			dsc_enc_caps->color_formats.bits.YCBCR_NATIVE_422 = 1;
+	}
 }
 
 /* Returns 'false' if no intersection was found for at least one capablity.