On Mon, Sep 9, 2013 at 11:36 AM, Alexandre Courbot <gnurou@xxxxxxxxx> wrote:
> On Sat, Sep 7, 2013 at 9:25 PM, David Herrmann <dh.herrmann@xxxxxxxxx> wrote:
>> From dbfb8e12166d494cd60823cbe84134d5d1a73ec8 Mon Sep 17 00:00:00 2001
>> From: David Herrmann <dh.herrmann@xxxxxxxxx>
>> Date: Sat, 7 Sep 2013 14:22:01 +0200
>> Subject: [PATCH] devm/simplefb: introduce and use devm_ioremap_wc()
>>
>> We want to use devm_ioremap_nocache() or even devm_ioremap_wc() to speed
>> up fbdev writes _a lot_. As devm_ioremap_wc() doesn't exist, yet,
>> introduce it along the way. Note that ioremap_wc() is aliases to
>> ioremap_nocache() in asm-generic/{io,iomem}.h so we can safely expect all
>> architectures to either provide it or use the same alias.
>>
>> Reported-by: Tom Gundersen <teg@xxxxxxx>
>> Signed-off-by: David Herrmann <dh.herrmann@xxxxxxxxx>
>> Cc: Stephen Warren <swarren@xxxxxxxxxxxxx>
>> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
>> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
>
> Tried this on SHIELD, and it dramatically increases performance.
>
> Tested-by: Alexandre Courbot <acourbot@xxxxxxxxxx>
Maybe the patch should be split into two though, one that adds
devm_ioremap_wc() and another that takes advantage of it for simplefb.
Alex.
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