[0/4] mpt3sas: Fix hardware bug in aero controllers.

Message

Suganath Prabu S Dec. 7, 2018, 7:28 a.m. UTC

Problem statement:
Sometimes aero controllers appears to be returning bad data (0)
for doorbell register read and if retries are performed immediately
after the bad read, they return good data.

Fix:
In below four patches added workaround to retry read operation from
controller doorbell registers for maximum three times, if read
returns zero.

Suganath Prabu (4):
  mpt3sas: Introduce flag for aero based controllers.
  mpt3sas: Add separate function for aero doorbell reads.
  mpt3sas: Replace readl with ioc->base_readl.
  mpt3sas: Update driver version to 27.101.00.00.

 drivers/scsi/mpt3sas/mpt3sas_base.c  | 69 ++++++++++++++++++++++++++----------
 drivers/scsi/mpt3sas/mpt3sas_base.h  |  7 ++--
 drivers/scsi/mpt3sas/mpt3sas_scsih.c | 14 ++++----
 3 files changed, 63 insertions(+), 27 deletions(-)

Comments

Martin K. Petersen Dec. 13, 2018, 2:29 a.m. UTC | #1

Suganath,

> Sometimes aero controllers appears to be returning bad data (0) for
> doorbell register read and if retries are performed immediately after
> the bad read, they return good data.

Applied to 4.21/scsi-queue, thanks.