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- From: Felix Fietkau <nbd@nbd.name>
- Date: Thu, 26 Nov 2015 17:03:46 +0100
- Subject: [PATCH] Revert "mtd: spi-nor: disable protection for Winbond flash at
- startup"
- This reverts commit c6fc2171b249e73745c497b578b417a2946f1b2f.
- This commit is breaking read access on at least s25fl064k, but also
- possibly other Spansion flash chips.
- Any mtd read seems to succeed, but simply returns a zero-filled buffer.
- Signed-off-by: Felix Fietkau <nbd@nbd.name>
- ---
- --- a/drivers/mtd/spi-nor/spi-nor.c
- +++ b/drivers/mtd/spi-nor/spi-nor.c
- @@ -1194,14 +1194,13 @@ int spi_nor_scan(struct spi_nor *nor, co
- mutex_init(&nor->lock);
-
- /*
- - * Atmel, SST, Intel/Numonyx, and others serial NOR tend to power up
- - * with the software protection bits set
- + * Atmel, SST and Intel/Numonyx serial nor tend to power
- + * up with the software protection bits set
- */
-
- 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);
- }
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