--- zzzz-none-000/linux-3.10.107/drivers/gpu/drm/udl/udl_transfer.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/drivers/gpu/drm/udl/udl_transfer.c	2021-02-04 17:41:59.000000000 +0000
@@ -82,12 +82,14 @@
 		((pixel >> 8) & 0xf800));
 }
 
-static bool pixel_repeats(const void *pixel, const uint32_t repeat, int bpp)
+static inline u16 get_pixel_val16(const uint8_t *pixel, int bpp)
 {
+	u16 pixel_val16 = 0;
 	if (bpp == 2)
-		return *(const uint16_t *)pixel == repeat;
-	else
-		return *(const uint32_t *)pixel == repeat;
+		pixel_val16 = *(const uint16_t *)pixel;
+	else if (bpp == 4)
+		pixel_val16 = pixel32_to_be16(*(const uint32_t *)pixel);
+	return pixel_val16;
 }
 
 /*
@@ -134,6 +136,7 @@
 		uint8_t *cmd_pixels_count_byte = NULL;
 		const u8 *raw_pixel_start = NULL;
 		const u8 *cmd_pixel_start, *cmd_pixel_end = NULL;
+		uint16_t pixel_val16;
 
 		prefetchw((void *) cmd); /* pull in one cache line at least */
 
@@ -154,33 +157,29 @@
 			    (int)(cmd_buffer_end - cmd) / 2))) * bpp;
 
 		prefetch_range((void *) pixel, (cmd_pixel_end - pixel) * bpp);
+		pixel_val16 = get_pixel_val16(pixel, bpp);
 
 		while (pixel < cmd_pixel_end) {
 			const u8 *const start = pixel;
-			u32 repeating_pixel;
+			const uint16_t repeating_pixel_val16 = pixel_val16;
 
-			if (bpp == 2) {
-				repeating_pixel = *(uint16_t *)pixel;
-				*(uint16_t *)cmd = cpu_to_be16(repeating_pixel);
-			} else {
-				repeating_pixel = *(uint32_t *)pixel;
-				*(uint16_t *)cmd = cpu_to_be16(pixel32_to_be16(repeating_pixel));
-			}
+			*(uint16_t *)cmd = cpu_to_be16(pixel_val16);
 
 			cmd += 2;
 			pixel += bpp;
 
-			if (unlikely((pixel < cmd_pixel_end) &&
-				     (pixel_repeats(pixel, repeating_pixel, bpp)))) {
+			while (pixel < cmd_pixel_end) {
+				pixel_val16 = get_pixel_val16(pixel, bpp);
+				if (pixel_val16 != repeating_pixel_val16)
+					break;
+				pixel += bpp;
+			}
+
+			if (unlikely(pixel > start + bpp)) {
 				/* go back and fill in raw pixel count */
 				*raw_pixels_count_byte = (((start -
 						raw_pixel_start) / bpp) + 1) & 0xFF;
 
-				while ((pixel < cmd_pixel_end) &&
-				       (pixel_repeats(pixel, repeating_pixel, bpp))) {
-					pixel += bpp;
-				}
-
 				/* immediately after raw data is repeat byte */
 				*cmd++ = (((pixel - start) / bpp) - 1) & 0xFF;