From: Andy Lutomirski Date: Thu, 26 May 2011 14:13:31 +0000 (-0400) Subject: efifb: Enable write-combining X-Git-Tag: v3.12-rc1~5687^2~4 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=3c004b4f7eab239e726c6dde0f6cfca46a96956b;p=kernel%2Fkernel-generic.git efifb: Enable write-combining Running fbcon on an uncached framebuffer is remarkably slow. So try to enable write combining in efifb. Without this patch, it takes 5.8 seconds from efifb probe to i915 probe (default options; no plymouth or quiet mode). With this patch, it only takes 1.7 seconds. That means we wasted over 4 seconds just writing to UC memory. Signed-off-by: Andy Lutomirski Signed-off-by: Peter Jones Signed-off-by: Paul Mundt --- diff --git a/drivers/video/efifb.c b/drivers/video/efifb.c index fb20584..7f06247 100644 --- a/drivers/video/efifb.c +++ b/drivers/video/efifb.c @@ -413,7 +413,7 @@ static int __devinit efifb_probe(struct platform_device *dev) info->apertures->ranges[0].base = efifb_fix.smem_start; info->apertures->ranges[0].size = size_remap; - info->screen_base = ioremap(efifb_fix.smem_start, efifb_fix.smem_len); + info->screen_base = ioremap_wc(efifb_fix.smem_start, efifb_fix.smem_len); if (!info->screen_base) { printk(KERN_ERR "efifb: abort, cannot ioremap video memory " "0x%x @ 0x%lx\n",