Author: kadesai
Date: Wed Dec 26 10:42:45 2018
New Revision: 342534
URL: https://svnweb.freebsd.org/changeset/base/342534
Log:
On Aero/Sea A0 cards retry MPT Fusion registers reads for max three times
Due to HW Errta on Aero/Sea A0 chipset on secure boot mode & on heavy IO load,
sometimes read operation on MPT Fusion registers will give zero value,
So, as a workaround driver will retry the MPT Fusion register
read operation for max three times upon reading zero value form these
registers.
Submitted by: Sreekanth Reddy <sreekanth.re...@broadcom.com>
Reviewed by: Kashyap Desai <kashyap.de...@broadcom.com>
Approved by: ken
MFC after: 3 days
Sponsored by: Broadcom Inc
Modified:
head/sys/dev/mpr/mprvar.h
Modified: head/sys/dev/mpr/mprvar.h
==============================================================================
--- head/sys/dev/mpr/mprvar.h Wed Dec 26 10:41:53 2018 (r342533)
+++ head/sys/dev/mpr/mprvar.h Wed Dec 26 10:42:45 2018 (r342534)
@@ -530,7 +530,14 @@ struct scsi_read_capacity_eedp
static __inline uint32_t
mpr_regread(struct mpr_softc *sc, uint32_t offset)
{
- return (bus_space_read_4(sc->mpr_btag, sc->mpr_bhandle, offset));
+ uint32_t ret_val, i = 0;
+ do {
+ ret_val =
+ bus_space_read_4(sc->mpr_btag, sc->mpr_bhandle, offset);
+ } while((sc->mpr_flags & MPR_FLAGS_SEA_IOC) &&
+ (ret_val == 0) && (++i < 3));
+
+ return ret_val;
}
static __inline void
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