tree 6506775bb94e7e99f1730f4fd50eb2f3f7359620
parent f5914a461eb9703773226a0813f6ffcae10c0861
author Tejun Heo <htejun@gmail.com> 1149067670 +0900
committer Tejun Heo <htejun@gmail.com> 1149067670 +0900

[PATCH] libata-hp-prep: implement followup softreset handling

In some cases, hardreset must be followed by SRST.

* some controllers can't classify with hardreset
* some controllers can't wait for !BSY after hardreset (LLDD should
  explicitly request followup softreset by returning -EAGAIN)
* (later) PM needs SRST w/ PMP==15 to operate after hardreset

To handle above cases, this patch implements follow-up softreset.
After a hardreset, ata_eh_reset() checks whether any of above
conditions are met and do a follow-up softreset if necessary.

Signed-off-by: Tejun Heo <htejun@gmail.com>