Framebuffers shouldn't be cached and it is usually very uncommon to read
them. Therefore, use ioremap_wc() to get significant speed improvements on
systems which provide it. On all other systems it's aliased to
ioremap_nocache() which is also fine.
Reported-by: Tom Gundersen <teg@xxxxxxx>
Signed-off-by: David Herrmann <dh.herrmann@xxxxxxxxx>
Tested-by: Tom Gundersen <teg@xxxxxxx>
Tested-by: Alexandre Courbot <acourbot@xxxxxxxxxx>
Tested-by: Stephen Warren <swarren@xxxxxxxxxxxxx>
---
drivers/video/simplefb.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/video/simplefb.c b/drivers/video/simplefb.c
index 74b016c..64db54a 100644
--- a/drivers/video/simplefb.c
+++ b/drivers/video/simplefb.c
@@ -219,8 +219,8 @@ static int simplefb_probe(struct platform_device *pdev)
info->fbops = &simplefb_ops;
info->flags = FBINFO_DEFAULT | FBINFO_MISC_FIRMWARE;
- info->screen_base = ioremap(info->fix.smem_start,
- info->fix.smem_len);
+ info->screen_base = ioremap_wc(info->fix.smem_start,
+ info->fix.smem_len);
if (!info->screen_base) {
framebuffer_release(info);
return -ENODEV;
--
1.8.4
--
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