From: Yicong Yang <yangyicong@hisilicon.com>
To: <tudor.ambarus@microchip.com>, <linux-mtd@lists.infradead.org>
Cc: vigneshr@ti.com, sergei.shtylyov@cogentembedded.com,
richard@nod.at, me@yadavpratyush.com, john.garry@huawei.com,
linuxarm@huawei.com, yangyicong@hisilicon.com,
alexander.sverdlin@nokia.com, miquel.raynal@bootlin.com
Subject: [RFC PATCH v2 0/2] Add support to Disable the flash quad mode
Date: Tue, 12 May 2020 19:26:57 +0800 [thread overview]
Message-ID: <1589282819-42358-1-git-send-email-yangyicong@hisilicon.com> (raw)
Previously we didn't disable the flash's quad mode when it's removed
Then comes the problem that if we next time load the flash
in SPI/Dual mode, it will not be correctly enabled as the quad enable
bits has not been cleared. I validated the condition on Cypress s25fs128s1.
This series adds the capability to disable the flash's quad mode. And
restore the flash when it's removed in spi_nor_restore().
RFC:
- I cleared quad mode bit in spi_nor_restore() when flash removed or
shutdown, follow what reset 4byte address does. But I don't know if
there is a situation that the flash is in quad mode by default. If so,
we should disable it in probe stage.
- The issue occurs when the user switch the spi mode of the flash.
Not sure whether a situation exists.
Changes since v1:
- modify the comments and fix the condition suggested by Pratyush's.
Link: https://lore.kernel.org/linux-mtd/1587720044-49172-1-git-send-email-yangyicong@hisilicon.com/
Yicong Yang (2):
mtd: spi-nor: Add capability to disable flash quad mode
mtd: spi-nor: Disable the flash quad mode in spi_nor_restore()
drivers/mtd/spi-nor/core.c | 56 +++++++++++++++++++++++++++++++++-------------
drivers/mtd/spi-nor/core.h | 8 +++----
2 files changed, 44 insertions(+), 20 deletions(-)
--
2.8.1
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next reply other threads:[~2020-05-12 11:27 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-12 11:26 Yicong Yang [this message]
2020-05-12 11:26 ` [RFC PATCH v2 1/2] mtd: spi-nor: Add capability to disable flash quad mode Yicong Yang
2020-06-15 10:53 ` Pratyush Yadav
2020-06-16 7:10 ` Yicong Yang
2020-05-12 11:26 ` [RFC PATCH v2 2/2] mtd: spi-nor: Disable the flash quad mode in spi_nor_restore() Yicong Yang
2020-06-15 10:56 ` Pratyush Yadav
2020-06-15 9:19 ` [RFC PATCH v2 0/2] Add support to Disable the flash quad mode Yicong Yang
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