From: Yicong Yang <yangyicong@hisilicon.com>
Date: Fri, 4 Sep 2020 15:47:19 +0800
Subject: Revert "mtd: spi-nor: Disable the flash quad mode in
spi_nor_restore()"
Git-commit: 7d90a9b2693a753abfc7034eacea5bbcbb566560
Patch-mainline: v5.9-rc6
References: jsc#SLE-14214 jsc#SLE-16606
Previous patch intends to restore the flash's QE bit when removed/shutdown,
but may have some problems and break the flash:
- for those originally in Quad mode, this patch will clear the QE bit
when unloaded the flash, which is incorrect.
- even with above problem solved, it may still break the flash as some
flash's QE bit is non-volatile and lots of set/reset will wear out
the bit.
- the restore method cannot be proved to be valid as if a hard
reset or accident crash happened, the spi_nor_restore() won't be
performed the the QE bit will not be restored as we expected to.
So let's revert it to fix this. The discussion can be found at [1].
This reverts commit cc59e6bb6cd69d3347c06ccce088c5c6052e041e.
[1] https://lore.kernel.org/linux-mtd/CAO8h3eFLVLRmw7u+rurKsg7=Nh2q-HVq-HgVXig8gf5Dffk8MA@mail.gmail.com/
Reported-by: Matthias Weisser <m.weisser.m@gmail.com>
Suggested-by: Vignesh Raghavendra <vigneshr@ti.com>
Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Link: https://lore.kernel.org/r/1599205640-26690-1-git-send-email-yangyicong@hisilicon.com
Signed-off-by: Matthias Brugger <mbrugger@suse.com>
---
drivers/mtd/spi-nor/core.c | 2 --
1 file changed, 2 deletions(-)
diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
index 65eff4ce6ab1..ab8f55438e21 100644
--- a/drivers/mtd/spi-nor/core.c
+++ b/drivers/mtd/spi-nor/core.c
@@ -3000,8 +3000,6 @@ void spi_nor_restore(struct spi_nor *nor)
if (nor->addr_width == 4 && !(nor->flags & SNOR_F_4B_OPCODES) &&
nor->flags & SNOR_F_BROKEN_RESET)
nor->params->set_4byte_addr_mode(nor, false);
-
- spi_nor_quad_enable(nor, false);
}
EXPORT_SYMBOL_GPL(spi_nor_restore);
--
2.28.0