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simplefb: use write-combined remapping 

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@jklm.no>
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Tested-by: Tom Gundersen <teg@jklm.no>
Tested-by: Alexandre Courbot <acourbot@nvidia.com>
Tested-by: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
This commit is contained in:
David Herrmann 2013-10-02 16:58:39 +02:00 committed by Tomi Valkeinen
parent 498f6d3660
commit 9e210be68a
1 changed files with 2 additions and 2 deletions
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4
drivers/video/simplefb.c
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@ -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;