From: Mark Lord <mlord@pobox.com>
Date: Wed, 25 Feb 2009 20:13:03 +0000 (-0500)
Subject: [libata] sata_mv: cache frequently-accessed registers
X-Git-Tag: v2.6.30-rc1~669^2~21
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=08da175937a35d34a83eaefbb3458472eb1a89d4;p=pandora-kernel.git

[libata] sata_mv: cache frequently-accessed registers

Maintain a local (mv_port_priv) cache of frequently accessed registers,
to avoid having to re-read them (very slow) on every transistion
between EDMA and non-EDMA modes.  This speeds up things like
flushing the drive write cache, and anything using basic DMA transfers.

Signed-off-by: Mark Lord <mlord@pobox.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
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