From: Tejun Heo <htejun@gmail.com>
Date: Wed, 31 May 2006 09:27:50 +0000 (+0900)
Subject: [PATCH] libata-hp-prep: implement followup softreset handling
X-Git-Tag: v2.6.18-rc1~1079^2~57
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=664faf09a05d74085c0b31e2c621d7647322325b;p=pandora-kernel.git

[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>
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