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mtd: spi-nor: Disable the flash quad mode in spi_nor_restore()

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If the flash's quad mode is enabled, it'll remain in the quad mode when
it's removed. If we drive the flash next time in Standard/Dual SPI mode,
the QE bit is not cleared and the function of flash's WP# and RESET#/HOLD#
have been switched to IO2 and IO3 and are not restored.

Disable the Quad mode in spi_nor_restore(), then the flash's QE bit will
be cleared when removed. This will make sure the flash always enter the
Standard/Dual SPI mode when loaded.

Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Reviewed-by: Pratyush Yadav <p.yadav@ti.com>
Link: https://lore.kernel.org/r/1594027356-19088-3-git-send-email-yangyicong@hisilicon.com
This commit is contained in:
Yicong Yang 2020-07-06 17:22:36 +08:00 committed by Tudor Ambarus
parent be192209d5
commit cc59e6bb6c
1 changed files with 2 additions and 0 deletions
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2
drivers/mtd/spi-nor/core.c
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@ -3000,6 +3000,8 @@ 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);