AuxXxilium/linux_dsm_epyc7002
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linux_dsm_epyc7002/drivers/mtd
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Martin Kepplinger d5d27fd982 mtd: rawnand: gpmi: fix MX28 bus master lockup problem 
Disable BCH soft reset according to MX23 erratum #2847 ("BCH soft
reset may cause bus master lock up") for MX28 too. It has the same
problem.

Observed problem: once per 100,000+ MX28 reboots NAND read failed on
DMA timeout errors:
[    1.770823] UBI: attaching mtd3 to ubi0
[    2.768088] gpmi_nand: DMA timeout, last DMA :1
[    3.958087] gpmi_nand: BCH timeout, last DMA :1
[    4.156033] gpmi_nand: Error in ECC-based read: -110
[    4.161136] UBI warning: ubi_io_read: error -110 while reading 64
bytes from PEB 0:0, read only 0 bytes, retry
[    4.171283] step 1 error
[    4.173846] gpmi_nand: Chip: 0, Error -1

Without BCH soft reset we successfully executed 1,000,000 MX28 reboots.

I have a quote from NXP regarding this problem, from July 18th 2016:

"As the i.MX23 and i.MX28 are of the same generation, they share many
characteristics. Unfortunately, also the erratas may be shared.
In case of the documented erratas and the workarounds, you can also
apply the workaround solution of one device on the other one. This have
been reported, but I’m afraid that there are not an estimated date for
updating the Errata documents.
Please accept our apologies for any inconveniences this may cause."

Fixes: 6f2a6a5256 ("mtd: nand: gpmi: reset BCH earlier, too, to avoid NAND startup problems")
Cc: stable@vger.kernel.org
Signed-off-by: Manfred Schlaegl <manfred.schlaegl@ginzinger.com>
Signed-off-by: Martin Kepplinger <martin.kepplinger@ginzinger.com>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Acked-by: Han Xu <han.xu@nxp.com>
Signed-off-by: Boris Brezillon <bbrezillon@kernel.org>
2019-02-06 09:39:22 +01:00
..
chips mtd: cfi_cmdset_0020: Mark expected switch fall-throughs 2018-11-09 20:40:11 +01:00
devices Merge tag 'devicetree-for-4.21' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux 2018-12-28 20:08:34 -08:00
lpddr
maps Kbuild updates for v4.21 2018-12-29 12:03:17 -08:00
nand mtd: rawnand: gpmi: fix MX28 bus master lockup problem 2019-02-06 09:39:22 +01:00
parsers mtd: partitions: Add OF support to RedBoot partitions 2018-11-12 11:51:02 +01:00
spi-nor spi: Updates for v4.21 2018-12-25 14:43:54 -08:00
tests mtd: rawnand: Allow selection of ECC byte ordering at runtime 2018-10-03 11:12:25 +02:00
ubi ubi: Do not drop UBI device reference before using 2018-12-13 22:09:44 +01:00
afs.c
ar7part.c mm: remove include/linux/bootmem.h 2018-10-31 08:54:16 -07:00
bcm47xxpart.c
bcm63xxpart.c
cmdlinepart.c
ftl.c
inftlcore.c
inftlmount.c
Kconfig Char/Misc driver patches for 4.21-rc1 2018-12-28 20:54:57 -08:00
Makefile mtd: Move Redboot partition parser 2018-11-12 11:44:13 +01:00
mtd_blkdevs.c mtd_blkdevs: convert to blk-mq 2018-10-16 08:09:58 -06:00
mtdblock_ro.c
mtdblock.c mtd: change len type from signed to unsigned type 2018-12-03 11:32:26 +01:00
mtdchar.c
mtdconcat.c
mtdcore.c mtd: Fix the check on nvmem_register() ret code 2019-01-07 14:06:22 +01:00
mtdcore.h mtd: Check add_mtd_device() ret code 2019-01-07 14:06:24 +01:00
mtdoops.c
mtdpart.c mtd: Make sure mtd->erasesize is valid even if the partition is of size 0 2019-02-06 00:02:51 +01:00
mtdsuper.c
mtdswap.c mtd: use DEFINE_SHOW_ATTRIBUTE() instead of open-coding it 2018-12-03 11:32:26 +01:00
nftlcore.c
nftlmount.c mtd: nftl: clean up indentation, remove extraneous tabs 2018-12-02 09:20:36 +01:00
ofpart.c
rfd_ftl.c
sm_ftl.c mtd: rawnand: Allow selection of ECC byte ordering at runtime 2018-10-03 11:12:25 +02:00
sm_ftl.h
ssfdc.c