diff options
| author | Luis R. Rodriguez | 2015-04-21 22:16:37 +0200 |
|---|---|---|
| committer | Tomi Valkeinen | 2015-06-03 11:41:53 +0200 |
| commit | 1e43a20396ee34a6b0305fc155cb59af13a89435 (patch) | |
| tree | 6a5369c3b80e5f3144f70cb6aca8528b1ceb6c27 /drivers/video/fbdev/atmel_lcdfb.c | |
| parent | video: fbdev: tdfxfb: use arch_phys_wc_add() and ioremap_wc() (diff) | |
| download | kernel-qcow2-linux-1e43a20396ee34a6b0305fc155cb59af13a89435.tar.gz kernel-qcow2-linux-1e43a20396ee34a6b0305fc155cb59af13a89435.tar.xz kernel-qcow2-linux-1e43a20396ee34a6b0305fc155cb59af13a89435.zip | |
video: fbdev: atmel_lcdfb: use ioremap_wc() for framebuffer
The driver doesn't use mtrr_add() or arch_phys_wc_add() but
since we know the framebuffer is isolated already on an
ioremap() we can take advantage of write combining for
performance where possible.
In this case there are a few motivations for this:
a) Take advantage of PAT when available
b) Help with the goal of eventually using _PAGE_CACHE_UC over
_PAGE_CACHE_UC_MINUS on x86 on ioremap_nocache() (see commit
de33c442e titled "x86 PAT: fix performance drop for glx,
use UC minus for ioremap(), ioremap_nocache() and
pci_mmap_page_range()")
Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Suresh Siddha <sbsiddha@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Juergen Gross <jgross@suse.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Antonino Daplas <adaplas@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <plagnioj@jcrosoft.com>
Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
Cc: linux-fbdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <mcgrof@suse.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Reviewed-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Diffstat (limited to 'drivers/video/fbdev/atmel_lcdfb.c')
| -rw-r--r-- | drivers/video/fbdev/atmel_lcdfb.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/video/fbdev/atmel_lcdfb.c b/drivers/video/fbdev/atmel_lcdfb.c index 94a8d04e60f9..abadc490fa1f 100644 --- a/drivers/video/fbdev/atmel_lcdfb.c +++ b/drivers/video/fbdev/atmel_lcdfb.c @@ -1266,7 +1266,8 @@ static int __init atmel_lcdfb_probe(struct platform_device *pdev) goto stop_clk; } - 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) { ret = -ENOMEM; goto release_intmem; |