Re: [BUG] simplefb not showing any output

On Sat, Sep 7, 2013 at 9:25 PM, David Herrmann [off-list ref] wrote:

From dbfb8e12166d494cd60823cbe84134d5d1a73ec8 Mon Sep 17 00:00:00 2001
From: David Herrmann <redacted>
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 <redacted>
Signed-off-by: David Herrmann <redacted>
Cc: Stephen Warren <redacted>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>

Tried this on SHIELD, and it dramatically increases performance.

Tested-by: Alexandre Courbot <acourbot@nvidia.com>

Alex.