Commit 9e210be6 authored Oct 02, 2013 by David Herrmann Committed by Tomi Valkeinen Oct 30, 2013

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>

parent 498f6d36

drivers/video/simplefb.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -219,7 +219,7 @@ 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->screen_base = ioremap_wc(info->fix.smem_start,
		info->fix.smem_len);
		if (!info->screen_base) {
		framebuffer_release(info);