drm: apple: Set min and max VRRs for MacBook Pros

Since these machines do not have proper EDID/DisplayID data, we need
to help the driver along a little bit. We know that "ProMotion" displays
can do 24-120 Hz VRR, so let's populate the mode with those values.

Signed-off-by: James Calligeros <[email protected]>

Author: chadmed

drivers/gpu/drm/apple/parser.c

@@ -531,8 +531,11 @@ static int parse_mode(struct dcp_parse_ctx *handle,
 	*/
 	if (vert.precise_sync_rate >> 16 == 120 &&
 	    ((horiz.active == 3024 && vert.active == 1964) ||
-	     (horiz.active == 3456 && vert.active == 2234)))
+	     (horiz.active == 3456 && vert.active == 2234))) {
+		out->min_vrr = 24 << 16;
+		out->max_vrr = 120 << 16;
 		out->vrr = true;
+	}
 
 	if (out->min_vrr && out->max_vrr)
 		out->vrr = true;