From 8a01dea639e4530dad1a945b1d5efbe903a9407e Mon Sep 17 00:00:00 2001
From: Sascha Hauer <s.hauer@pengutronix.de>
Date: Fri, 20 Dec 2013 11:25:53 +0100
Subject: [PATCH] video: ipufb: Use uncached memory for framebuffer

Otherwise funny caching artifacts can occur on the screen.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 drivers/video/imx-ipu-fb.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/video/imx-ipu-fb.c b/drivers/video/imx-ipu-fb.c
index 18a70521d..727664738 100644
--- a/drivers/video/imx-ipu-fb.c
+++ b/drivers/video/imx-ipu-fb.c
@@ -26,6 +26,7 @@
 #include <malloc.h>
 #include <errno.h>
 #include <asm-generic/div64.h>
+#include <asm/mmu.h>
 #include <mach/imx-ipu-fb.h>
 #include <linux/clk.h>
 #include <linux/err.h>
@@ -1022,8 +1023,12 @@ static int imxfb_probe(struct device_d *dev)
 	 * memory for screen usage
 	 */
 	fbi->info.screen_base = pdata->framebuffer;
-	if (fbi->info.screen_base == NULL) {
-		fbi->info.screen_base = malloc(fbi->info.screen_size);
+	if (fbi->info.screen_base) {
+		remap_range(fbi->info.screen_base,
+			fbi->info.screen_size,
+			mmu_get_pte_uncached_flags());
+	} else {
+		fbi->info.screen_base = dma_alloc_coherent(fbi->info.screen_size);
 		if (!fbi->info.screen_base)
 			return -ENOMEM;
 	}