drm/amd/display: allow 18 bit dp output on DCN3

We need this to pass dp compliance.
Signed-off-by: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Reviewed-by: Chris Park <Chris.Park@amd.com>
Reviewed-by: Nikola Cornij <nikola.cornij@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/dcn30/dcn30_resource.c

@@ -2020,20 +2020,6 @@ static bool dcn30_internal_validate_bw(
 
 	dml_log_mode_support_params(&context->bw_ctx.dml);
 
-	/* TODO: Need to check calculated vlevel why that fails validation of below resolutions */
-	if (context->res_ctx.pipe_ctx[0].stream != NULL) {
-		if (context->res_ctx.pipe_ctx[0].stream->timing.h_addressable == 640  && context->res_ctx.pipe_ctx[0].stream->timing.v_addressable == 480)
-			vlevel = 0;
-		if (context->res_ctx.pipe_ctx[0].stream->timing.h_addressable == 1280 && context->res_ctx.pipe_ctx[0].stream->timing.v_addressable == 800)
-			vlevel = 0;
-		if (context->res_ctx.pipe_ctx[0].stream->timing.h_addressable == 1280 && context->res_ctx.pipe_ctx[0].stream->timing.v_addressable == 768)
-			vlevel = 0;
-		if (context->res_ctx.pipe_ctx[0].stream->timing.h_addressable == 1280 && context->res_ctx.pipe_ctx[0].stream->timing.v_addressable == 1024)
-			vlevel = 0;
-		if (context->res_ctx.pipe_ctx[0].stream->timing.h_addressable == 2048 && context->res_ctx.pipe_ctx[0].stream->timing.v_addressable == 1536)
-			vlevel = 0;
-	}
-
 	if (vlevel == context->bw_ctx.dml.soc.num_states)
 		goto validate_fail;
 

drivers/gpu/drm/amd/display/dc/dml/dcn30/display_mode_vba_30.c

@@ -3628,7 +3628,7 @@ static double TruncToValidBPP(
 			}
 		}
 	} else {
-		if (!((DSCEnable == false && (DesiredBPP == NonDSCBPP2 || DesiredBPP == NonDSCBPP1 || DesiredBPP == NonDSCBPP0)) ||
+		if (!((DSCEnable == false && (DesiredBPP == NonDSCBPP2 || DesiredBPP == NonDSCBPP1 || DesiredBPP == NonDSCBPP0 || DesiredBPP == 18)) ||
 				(DSCEnable && DesiredBPP >= MinDSCBPP && DesiredBPP <= MaxDSCBPP))) {
 			return BPP_INVALID;
 		} else {