From: "Luis R. Rodriguez" <mcg...@suse.com>
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() (de33c442e)
Cc: Suresh Siddha <suresh.b.sid...@intel.com>
Cc: Venkatesh Pallipadi <venkatesh.pallip...@intel.com>
Cc: Ingo Molnar <mi...@elte.hu>
Cc: Thomas Gleixner <t...@linutronix.de>
Cc: Juergen Gross <jgr...@suse.com>
Cc: Daniel Vetter <daniel.vet...@ffwll.ch>
Cc: Andy Lutomirski <l...@amacapital.net>
Cc: Dave Airlie <airl...@redhat.com>
Cc: Antonino Daplas <adap...@gmail.com>
Cc: Jean-Christophe Plagniol-Villard <plagn...@jcrosoft.com>
Cc: Tomi Valkeinen <tomi.valkei...@ti.com>
Cc: linux-fb...@vger.kernel.org
Cc: linux-ker...@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <mcg...@suse.com>
---
drivers/video/fbdev/atmel_lcdfb.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/video/fbdev/atmel_lcdfb.c
b/drivers/video/fbdev/atmel_lcdfb.c
index 94a8d04..abadc49 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;
--
2.3.2.209.gd67f9d5.dirty
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