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efifb: Enable write-combining

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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 <[email protected]>
Signed-off-by: Peter Jones <[email protected]>
Signed-off-by: Paul Mundt <[email protected]>
This commit is contained in:
Andy Lutomirski 2011-05-26 10:13:31 -04:00 • committed by Paul Mundt
commit 3c004b4f7e
1 changed files with 1 additions and 1 deletions
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2
drivers/video/efifb.c
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@ -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",