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| author | Yicong Yang <yangyicong@hisilicon.com> | 2020-09-04 15:47:19 +0800 |
|---|---|---|
| committer | Vignesh Raghavendra <vigneshr@ti.com> | 2020-09-14 20:58:26 +0530 |
| commit | 7d90a9b2693a753abfc7034eacea5bbcbb566560 (patch) | |
| tree | e7d07d1683d413fa365a7fb0fd5795bcf9872953 /drivers | |
| parent | 856deb866d16e29bd65952e0289066f6078af773 (diff) | |
| download | linux-7d90a9b2693a753abfc7034eacea5bbcbb566560.tar.bz2 | |
Revert "mtd: spi-nor: Disable the flash quad mode in spi_nor_restore()"
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
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mtd/spi-nor/core.c | 2 |
1 files changed, 0 insertions, 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); |