[PATCH v3] mtd: spi-nor: Check bus width while setting QE bit

[PATCH v3] mtd: spi-nor: Check bus width while setting QE bit

[Hsin-Yi Wang]

spi_nor_write_16bit_sr_and_check() should also check if bus width is
4 before setting QE bit.

Fixes: 39d1e3340c73 ("mtd: spi-nor: Fix clearing of QE bit on lock()/unlock()")
Suggested-by: Michael Walle <michael@walle.cc>
Suggested-by: Tudor Ambarus <tudor.ambarus@linaro.org>
Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
---
v2: https://lore.kernel.org/lkml/20230816104245.2676965-1-hsinyi@chromium.org/
---
 drivers/mtd/spi-nor/core.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
index 614960c7d22cc..1328128dfe65c 100644
--- a/drivers/mtd/spi-nor/core.c
+++ b/drivers/mtd/spi-nor/core.c
@@ -870,7 +870,9 @@ static int spi_nor_write_16bit_sr_and_check(struct spi_nor *nor, u8 sr1)
 		ret = spi_nor_read_cr(nor, &sr_cr[1]);
 		if (ret)
 			return ret;
-	} else if (nor->params->quad_enable) {
+	} else if (spi_nor_get_protocol_width(nor->read_proto) == 4 &&
+		   spi_nor_get_protocol_width(nor->write_proto) == 4 &&
+		   nor->params->quad_enable) {
 		/*
 		 * If the Status Register 2 Read command (35h) is not
 		 * supported, we should at least be sure we don't
-- 
2.42.0.rc1.204.g551eb34607-goog

Re: [PATCH v3] mtd: spi-nor: Check bus width while setting QE bit

[Michael Walle]

> spi_nor_write_16bit_sr_and_check() should also check if bus width is
> 4 before setting QE bit.
> 
> Fixes: 39d1e3340c73 ("mtd: spi-nor: Fix clearing of QE bit on 
> lock()/unlock()")
> Suggested-by: Michael Walle <michael@walle.cc>
> Suggested-by: Tudor Ambarus <tudor.ambarus@linaro.org>
> Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>

I'm not sure if the comment beneath needs an update, too.

In any case:
Reviewed-by: Michael Walle <michael@walle.cc>

> ---
> v2: 
> https://lore.kernel.org/lkml/20230816104245.2676965-1-hsinyi@chromium.org/
> ---
>  drivers/mtd/spi-nor/core.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
> index 614960c7d22cc..1328128dfe65c 100644
> --- a/drivers/mtd/spi-nor/core.c
> +++ b/drivers/mtd/spi-nor/core.c
> @@ -870,7 +870,9 @@ static int spi_nor_write_16bit_sr_and_check(struct 
> spi_nor *nor, u8 sr1)
>  		ret = spi_nor_read_cr(nor, &sr_cr[1]);
>  		if (ret)
>  			return ret;
> -	} else if (nor->params->quad_enable) {
> +	} else if (spi_nor_get_protocol_width(nor->read_proto) == 4 &&
> +		   spi_nor_get_protocol_width(nor->write_proto) == 4 &&
> +		   nor->params->quad_enable) {
>  		/*
>  		 * If the Status Register 2 Read command (35h) is not
>  		 * supported, we should at least be sure we don't

Re: [PATCH v3] mtd: spi-nor: Check bus width while setting QE bit

[Tudor Ambarus]

On Fri, 18 Aug 2023 14:42:23 +0800, Hsin-Yi Wang wrote:
> spi_nor_write_16bit_sr_and_check() should also check if bus width is
> 4 before setting QE bit.
> 
> 

Updated comment in the code and
applied to git://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git,
spi-nor/next branch. Thanks!

[1/1] mtd: spi-nor: Check bus width while setting QE bit
      https://git.kernel.org/mtd/c/f01d8155a92e

Cheers,
-- 
Tudor Ambarus <tudor.ambarus@linaro.org>