[libata] sata_mv: Enable use of (basic) DMA for ATAPI on GEN_IIE chips

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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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Mark Lord 2009-02-25 15:14:48 -05:00 • committed by Jeff Garzik

parent 08da175937

commit c01e8a2312

1 changed files with 28 additions and 24 deletions

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52

drivers/ata/sata_mv.c

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