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authorJeff Garzik <jgarzik@redhat.com>2004-03-17 19:00:55 -0500
committerJeff Garzik <jgarzik@redhat.com>2004-03-17 19:00:55 -0500
commit4b01f66c0e70136855630d5694a50e6f47a9b5e1 (patch)
treef6893c828c7b6f85c8b18f3ae664fe34eb99279e /include/linux
parent032d931752120fe5cc32d192af6f815ca135ef05 (diff)
[libata] update dma start/stop path to only set/clear the bits we care about
Legacy IDE software has traditionally unconditionally cleared the bits in the IDE BMDMA control register, but at least one controller has important bits in the 'reserved' area that we don't want to touch. So now, we only set/clear the data-direction and dma-start bits, and leave the rest alone.
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