linux-kernel - [PATCH] mptbase: Reset ioc initiator during PCI resume

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Message-ID: <20070920211014.GA24047@tree.beaverton.ibm.com>
Date:	Thu, 20 Sep 2007 14:10:15 -0700
From:	"Darrick J. Wong" <djwong@...ibm.com>
To:	linux-scsi <linux-scsi@...r.kernel.org>,
	mpt_linux_developer@....com, Eric.Moore@....com, support@....com
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] mptbase: Reset ioc initiator during PCI resume

It appears that the LSI SAS 1064E chip needs to be reset after a
suspend/resume cycle before the driver attempts further communications with
the chip.  Without this patch, resuming the chip results in this error
message being printed repeatedly and no more disk I/O.

mptbase: ioc0: ERROR - Invalid IOC facts reply, msgLength=0 offsetof=6!

So far it seems to fix suspend/resume on all the MPT Fusion cards I have
(SAS and U320 SCSI) but since I don't know the internals of that chip I
can't say for sure if this is a proper fix.

Signed-off-by: Darrick J. Wong <djwong@...ibm.com>
---

 drivers/message/fusion/mptbase.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/drivers/message/fusion/mptbase.c b/drivers/message/fusion/mptbase.c
index 414c109..97895bd 100644
--- a/drivers/message/fusion/mptbase.c
+++ b/drivers/message/fusion/mptbase.c
@@ -1772,6 +1772,12 @@ mpt_resume(struct pci_dev *pdev)
 		(mpt_GetIocState(ioc, 1) >> MPI_IOC_STATE_SHIFT),
 		CHIPREG_READ32(&ioc->chip->Doorbell));
 
+	/* put ioc into READY_STATE */
+	if(SendIocReset(ioc, MPI_FUNCTION_IOC_MESSAGE_UNIT_RESET, CAN_SLEEP)) {
+		printk(MYIOC_s_ERR_FMT
+		"pci-resume:  IOC msg unit reset failed!\n", ioc->name);
+	}
+
 	/* bring ioc to operational state */
 	if ((recovery_state = mpt_do_ioc_recovery(ioc,
 	    MPT_HOSTEVENT_IOC_RECOVER, CAN_SLEEP)) != 0) {
-
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