]> git.karo-electronics.de Git - linux-beck.git/commit
ARM: mvebu: implement Armada 375 coherency workaround
authorThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Mon, 14 Apr 2014 13:47:05 +0000 (15:47 +0200)
committerJason Cooper <jason@lakedaemon.net>
Thu, 24 Apr 2014 05:00:37 +0000 (05:00 +0000)
commit5ab5afd8ba837560f76f8ee527271d2e819bcaef
treee2c610986de4ce441f5e3d1b76e4cf7c0a542a49
parent77fa4b9ab0aafc0a06976814ad62aeff990dfd2c
ARM: mvebu: implement Armada 375 coherency workaround

The early revisions of Armada 375 SOCs (Z1 stepping) have a bug in the
I/O coherency unit that prevents using the normal method for the I/O
coherency barrier. The recommended workaround is to use a XOR memset
transfer to act as the I/O coherency barrier.

This involves "borrowing" a XOR engine, which gets disabled in the
Device Tree so the normal XOR driver doesn't use it.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Link: https://lkml.kernel.org/r/1397483228-25625-8-git-send-email-thomas.petazzoni@free-electrons.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
arch/arm/mach-mvebu/coherency.c