drm/amd/display: Add debug option to disable DSC support

[how]
Empty dsc enc caps when debug option is set to disable DSC.
Signed-off-by: Wenjing Liu <Wenjing.Liu@amd.com>
Reviewed-by: Nikola Cornij <Nikola.Cornij@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -425,6 +425,7 @@ struct dc_debug_options {
 	bool validate_dml_output;
 	bool enable_dmcub_surface_flip;
 	bool usbc_combo_phy_reset_wa;
+	bool disable_dsc;
 };
 
 struct dc_debug_data {

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

@@ -224,7 +224,8 @@ static void get_dsc_enc_caps(
 
 	memset(dsc_enc_caps, 0, sizeof(struct dsc_enc_caps));
 	if (dsc) {
-		dsc->funcs->dsc_get_enc_caps(dsc_enc_caps, pixel_clock_100Hz);
+		if (!dsc->ctx->dc->debug.disable_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;
 	}