From 7149733ba73fd00b6b47994cd89840852c9ab48a Mon Sep 17 00:00:00 2001 From: Andy Lutomirski Date: Thu, 26 May 2011 10:13:31 -0400 Subject: [PATCH] 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 --- drivers/video/efifb.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/video/efifb.c b/drivers/video/efifb.c index fb205843c2c72..7f06247a21e87 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", -- 2.39.5