linux-kernel - Re: [RESEND PATCH] mtd: spi-nor: core: Check written SR value in spi_nor_write_16bit_sr_and

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Message-ID: <0e02112a-317c-e95b-e0d3-7ed2c74c3509@microchip.com>
Date:   Wed, 27 Apr 2022 07:11:18 +0000
From:   <Tudor.Ambarus@...rochip.com>
To:     <p.yadav@...com>, <chentsung@...omium.org>
CC:     <michael@...le.cc>, <miquel.raynal@...tlin.com>, <richard@....at>,
        <vigneshr@...com>, <linux-kernel@...r.kernel.org>,
        <linux-mtd@...ts.infradead.org>
Subject: Re: [RESEND PATCH] mtd: spi-nor: core: Check written SR value in
 spi_nor_write_16bit_sr_and_check()

On 1/31/22 19:19, Pratyush Yadav wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> On 26/01/22 03:32PM, Chen-Tsung Hsieh wrote:
>> Read back Status Register 1 to ensure that the written byte match the
>> received value and return -EIO if read back test failed.
>>
>> Without this patch, spi_nor_write_16bit_sr_and_check() only check the
>> second half of the 16bit. It causes errors like spi_nor_sr_unlock()
>> return success incorrectly when spi_nor_write_16bit_sr_and_check()
>> doesn't write SR successfully.
>>
>> Fixes: 39d1e3340c73 ("mtd: spi-nor: Fix clearing of QE bit on lock()/unlock()")
>> Signed-off-by: Chen-Tsung Hsieh <chentsung@...omium.org>
> 
> I don't know much about this bit of code but this patch looks fine to me
> from the surface. Would be nice to hear from Tudor about this too since
> he added the function.

Reviewed-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
> 
> Acked-by: Pratyush Yadav <p.yadav@...com>