[PATCH] mptbase: Reset ioc initiator during PCI resume

Darrick J. Wong
2007-09-20T21:10:10Z

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@us.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) {