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 --- 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;