diff options
| author | Andy Lutomirski <luto@MIT.EDU> | 2011-05-26 10:13:31 -0400 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2011-06-02 17:18:04 +0900 |
| commit | 3c004b4f7eab239e726c6dde0f6cfca46a96956b (patch) | |
| tree | 91992251a5ff8967159fcfd7802732e14369d9de /drivers/video/efifb.c | |
| parent | 0057f1809d44b26765ec2374e0107a2f8ab256f5 (diff) | |
| download | kernel_samsung_smdk4412-3c004b4f7eab239e726c6dde0f6cfca46a96956b.zip kernel_samsung_smdk4412-3c004b4f7eab239e726c6dde0f6cfca46a96956b.tar.gz kernel_samsung_smdk4412-3c004b4f7eab239e726c6dde0f6cfca46a96956b.tar.bz2 | |
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 <luto@mit.edu>
Signed-off-by: Peter Jones <pjones@redhat.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'drivers/video/efifb.c')
| -rw-r--r-- | drivers/video/efifb.c | 2 |
1 files changed, 1 insertions, 1 deletions
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", |