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[SCSI] mpt2sas: Update the timing requirements for issuing a Hard Reset 

Updated the mpt2sas driver code that issues hard reset to comply with the
timing requirements mentioned in MPI specifications rev V.

[jejb: checpatch fixes]
Signed-off-by: Sreekanth Reddy <Sreekanth.Reddy@lsi.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Sreekanth Reddy 2013-02-01 21:55:43 +05:30 committed by James Bottomley
parent 10ec24e4ce
commit ca6832e91b
1 changed files with 13 additions and 7 deletions
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20
drivers/scsi/mpt2sas/mpt2sas_base.c
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@ -3936,11 +3936,15 @@ _base_diag_reset(struct MPT2SAS_ADAPTER *ioc, int sleep_flag)
writel(host_diagnostic | MPI2_DIAG_RESET_ADAPTER,
&ioc->chip->HostDiagnostic);
/* don't access any registers for 50 milliseconds */
msleep(50);
/* This delay allows the chip PCIe hardware time to finish reset tasks*/
if (sleep_flag == CAN_SLEEP)
msleep(MPI2_HARD_RESET_PCIE_FIRST_READ_DELAY_MICRO_SEC/1000);
else
mdelay(MPI2_HARD_RESET_PCIE_FIRST_READ_DELAY_MICRO_SEC/1000);
/* 300 second max wait */
for (count = 0; count < 3000000 ; count++) {
/* Approximately 300 second max wait */
for (count = 0; count < (300000000 /
MPI2_HARD_RESET_PCIE_SECOND_READ_DELAY_MICRO_SEC); count++) {
host_diagnostic = readl(&ioc->chip->HostDiagnostic);
@ -3949,11 +3953,13 @@ _base_diag_reset(struct MPT2SAS_ADAPTER *ioc, int sleep_flag)
if (!(host_diagnostic & MPI2_DIAG_RESET_ADAPTER))
break;
/* wait 100 msec */
/* Wait to pass the second read delay window */
if (sleep_flag == CAN_SLEEP)
msleep(1);
msleep(MPI2_HARD_RESET_PCIE_SECOND_READ_DELAY_MICRO_SEC
/1000);
else
mdelay(1);
mdelay(MPI2_HARD_RESET_PCIE_SECOND_READ_DELAY_MICRO_SEC
/1000);
}
if (host_diagnostic & MPI2_DIAG_HCB_MODE) {