From: Yicong Yang <yangyicong@hisilicon.com>
To: <tudor.ambarus@microchip.com>, <p.yadav@ti.com>,
<linux-mtd@lists.infradead.org>
Cc: vigneshr@ti.com, sergei.shtylyov@cogentembedded.com,
richard@nod.at, john.garry@huawei.com, linuxarm@huawei.com,
yangyicong@hisilicon.com, alexander.sverdlin@nokia.com,
miquel.raynal@bootlin.com
Subject: [PATCH v2 2/2] mtd: spi-nor: Disable the flash quad mode in spi_nor_restore()
Date: Mon, 6 Jul 2020 17:22:36 +0800 [thread overview]
Message-ID: <1594027356-19088-3-git-send-email-yangyicong@hisilicon.com> (raw)
In-Reply-To: <1594027356-19088-1-git-send-email-yangyicong@hisilicon.com>
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>
Reviewed-by: Pratyush Yadav <p.yadav@ti.com>
---
drivers/mtd/spi-nor/core.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
index f3d4b96..2099403 100644
--- a/drivers/mtd/spi-nor/core.c
+++ b/drivers/mtd/spi-nor/core.c
@@ -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);
--
2.8.1
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next prev parent reply other threads:[~2020-07-06 9:26 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-06 9:22 [PATCH v2 0/2] Add support to Disable the flash quad mode Yicong Yang
2020-07-06 9:22 ` [PATCH v2 1/2] mtd: spi-nor: Add capability to disable " Yicong Yang
2020-07-06 9:22 ` Yicong Yang [this message]
2020-07-13 9:26 ` [PATCH v2 0/2] Add support to Disable the " Tudor Ambarus
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