From: Lennert Buytenhek <buytenh@wantstofly.org>
Date: Fri, 2 Jun 2006 18:51:50 +0000 (+0100)
Subject: [ARM] 3539/1: ixp23xx: fix __arch_ixp23xx_is_coherent() for A1 stepping
X-Git-Tag: v2.6.17-rc6~49^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a77bc69138a4f52d003ca81d075f386953f6b25a;p=pandora-kernel.git

[ARM] 3539/1: ixp23xx: fix __arch_ixp23xx_is_coherent() for A1 stepping

Patch from Lennert Buytenhek

The current __ixp23xx_arch_is_coherent() check assumes that the
lower byte of IXP23XX_PRODUCT_ID is identical to the lower byte of
processor_id, but this is not the case, and because of this we were
incorrectly enabling coherency on A1 stepping CPUs.

Stepping A1 of the ixp2350, which has a PRODUCT_ID of 0x401, has '02'
in the lower byte of processor_id, while A2, with a PRODUCT_ID of
0x402, has '04' in the lower byte of processor_id.

So, to check for >= A2, we really need to check the lower byte of
processor_id against >= 4.

Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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