To avoid caching effects on the display use uncached memory.
Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
---
drivers/video/stm.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/video/stm.c b/drivers/video/stm.c
index 92bff9c..c825092 100644
--- a/drivers/video/stm.c
+++ b/drivers/video/stm.c
@@ -24,6 +24,8 @@
#include <errno.h>
#include <xfuncs.h>
#include <io.h>
+#include <dma.h>
+#include <asm/mmu.h>
#include <stmp-device.h>
#include <linux/clk.h>
#include <linux/err.h>
@@ -329,8 +331,13 @@ static int stmfb_activate_var(struct fb_info *fb_info)
return -ENOMEM;
fb_info->screen_base = fbi->fixed_screen;
fbi->memory_size = fbi->fixed_screen_size;
+ remap_range(fbi->fixed_screen,
+ fbi->fixed_screen_size,
+ mmu_get_pte_uncached_flags());
} else {
- fb_info->screen_base = xrealloc(fb_info->screen_base, size);
+ fb_info->screen_base = dma_alloc_coherent(size, NULL);
+ if (!fb_info->screen_base)
+ return -ENOMEM;
fbi->memory_size = size;
}
--
2.1.4
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