tree 32e8be09d7fc0c878b479a65666a18b0341b7529
parent a5bfc4714b3f01365aef89a92673f2ceb1ccf246
author Mark Lord <mlord@pobox.com> 1235592783 -0500
committer Jeff Garzik <jgarzik@redhat.com> 1237946560 -0400

[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>