From c01e8a23128c746f23088db836bd4c820f3eb0b4 Mon Sep 17 00:00:00 2001
From: Mark Lord <mlord@pobox.com>
Date: Wed, 25 Feb 2009 15:14:48 -0500
Subject: [PATCH] [libata] sata_mv: Enable use of (basic) DMA for ATAPI on
 GEN_IIE chips

This also gets rid of any need for mv_mode_filter().

Using basic DMA on GEN_IIE requires setting an undocumented
bit in an undocumented register.  For safety, we clear that
bit again when switching back to EDMA mode.

To avoid a performance penalty when switching modes,
we cache the register in port_priv, as already done for other regs.

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