From: Tejun Heo <htejun@gmail.com>
Date: Sun, 20 Aug 2006 08:56:38 +0000 (+0900)
Subject: [PATCH] ata_piix: fix ghost device probing by honoring PCS present bits
X-Git-Tag: v2.6.18-rc5~60^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f1a58ecae527fc67c87ce4dcb9e73894f64aadfe;p=pandora-kernel.git

[PATCH] ata_piix: fix ghost device probing by honoring PCS present bits

Move out PCS handling from piix_sata_prereset() into
piix_sata_present_mask() and use it from newly implemented
piix_sata_softreset().  Class codes for devices which are indicated to
be absent by PCS are cleared to ATA_DEV_NONE.  This fixes ghost device
problem reported on ICH6 and 7.

This patch moves PCS handling from prereset to softreset, which makes
two behavior changes.

* perform softreset even when PCS indicates no device
* PCS handling is repeated before retrying softresets due to reset
  failures.

Both behavior changes are intended and more consistent with how other
drivers behave.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
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