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| author | Brian Norris <computersforpeace@gmail.com> | 2015-12-15 10:48:20 -0800 |
|---|---|---|
| committer | Brian Norris <computersforpeace@gmail.com> | 2016-01-05 16:00:03 -0800 |
| commit | 67b9bcd36906e12a15ffec19463afbbd6a41660e (patch) | |
| tree | 19adb5fb993d851e177a9d958f102844ce87bc5a /drivers | |
| parent | 472b444eef934eb7e90334efdd7fc7954cfe5132 (diff) | |
| download | linux-67b9bcd36906e12a15ffec19463afbbd6a41660e.tar.gz linux-67b9bcd36906e12a15ffec19463afbbd6a41660e.tar.bz2 linux-67b9bcd36906e12a15ffec19463afbbd6a41660e.zip | |
mtd: spi-nor: fix Spansion regressions (aliased with Winbond)
Spansion and Winbond have occasionally used the same manufacturer ID,
and they don't support the same features. Particularly, writing SR=0
seems to break read access for Spansion's s25fl064k. Unfortunately, we
don't currently have a way to differentiate these Spansion and Winbond
parts, so rather than regressing support for these Spansion flash, let's
drop the new Winbond lock/unlock support for now. We can try to address
Winbond support during the next release cycle.
Original discussion:
http://patchwork.ozlabs.org/patch/549173/
http://patchwork.ozlabs.org/patch/553683/
Fixes: 357ca38d4751 ("mtd: spi-nor: support lock/unlock/is_locked for Winbond")
Fixes: c6fc2171b249 ("mtd: spi-nor: disable protection for Winbond flash at startup")
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Reported-by: Felix Fietkau <nbd@openwrt.org>
Cc: Felix Fietkau <nbd@openwrt.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mtd/spi-nor/spi-nor.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c index 49883905a434..f5d59de1ee6e 100644 --- a/drivers/mtd/spi-nor/spi-nor.c +++ b/drivers/mtd/spi-nor/spi-nor.c @@ -1200,8 +1200,7 @@ int spi_nor_scan(struct spi_nor *nor, const char *name, enum read_mode mode) if (JEDEC_MFR(info) == SNOR_MFR_ATMEL || JEDEC_MFR(info) == SNOR_MFR_INTEL || - JEDEC_MFR(info) == SNOR_MFR_SST || - JEDEC_MFR(info) == SNOR_MFR_WINBOND) { + JEDEC_MFR(info) == SNOR_MFR_SST) { write_enable(nor); write_sr(nor, 0); } @@ -1217,8 +1216,7 @@ int spi_nor_scan(struct spi_nor *nor, const char *name, enum read_mode mode) mtd->_read = spi_nor_read; /* NOR protection support for STmicro/Micron chips and similar */ - if (JEDEC_MFR(info) == SNOR_MFR_MICRON || - JEDEC_MFR(info) == SNOR_MFR_WINBOND) { + if (JEDEC_MFR(info) == SNOR_MFR_MICRON) { nor->flash_lock = stm_lock; nor->flash_unlock = stm_unlock; nor->flash_is_locked = stm_is_locked; |