From mboxrd@z Thu Jan  1 00:00:00 1970
From: jszhang@marvell.com (Jisheng Zhang)
Date: Fri, 14 Feb 2014 15:54:38 +0800
Subject: use {readl|writel}_relaxed instead of readl/writel in
 i2c-designware-core ?
Message-ID: <20140214155438.4f749a79@xhacker>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

Hi all,

The writel/readl is too expensive especially on Cortex A9 w/ outer L2 cache. This
introduce i2c read/write error on Marvell Berlin SoCs when there are L2 cache
maintenance operations at the same time.

In our internal berlin bsp, we just replaced readl/writel with the relaxed
version. But AFAIK, the "relaxed" version doesn't exist on all architectures. How
to handle this issue? 

Any suggestions are appreciated.

Thanks in advance,
Jisheng