Jeff Garzik wrote:
Tejun Heo wrote:
Instead of writing 0xf blindly, preserve the content of write-once
PORTS_IMPL register over host resets.
This patch is taken from Jeff Garzik's AHCI init update patch.
Signed-off-by: Tejun Heo <htejun@xxxxxxxxx>
Cc: Jeff Garzik <jgarzik@xxxxxxxxx>
One reason why I didn't go ahead and apply this is for
uninitalized-by-BIOS cases that are the reason I originally hardcoded a
0xf value into the register.
This patch is OK, iff we also include a test to see if impl_save==0
prior to global reset. If that is the case, we should hardcode 0xf or
(1<<n_ports)-1
Will do.
--
tejun
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