Re: [PATCH v4 15/20] mtd: spi-nor: Extend the QE Read Back test to both SR1 and SR2

[Vignesh Raghavendra <vigneshr@xxxxxx>]

On 02/11/19 4:53 PM, Tudor.Ambarus@xxxxxxxxxxxxx wrote:
> From: Tudor Ambarus <tudor.ambarus@xxxxxxxxxxxxx>
> 
> In case of 16-bit Write Status Register, check that both SR1 and
> SR2 were written correctly.
> 
> Signed-off-by: Tudor Ambarus <tudor.ambarus@xxxxxxxxxxxxx>
> ---

This can be merged with previous patch as changes are quite similar

Regards
Vignesh

>  drivers/mtd/spi-nor/spi-nor.c | 29 ++++++++++++++++++++++++++++-
>  1 file changed, 28 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
> index 08fd2c97897d..8f11c00e8ae5 100644
> --- a/drivers/mtd/spi-nor/spi-nor.c
> +++ b/drivers/mtd/spi-nor/spi-nor.c
> @@ -2067,6 +2067,7 @@ static int spansion_no_read_cr_quad_enable(struct spi_nor *nor)
>  {
>  	u8 *sr_cr = nor->bouncebuf;
>  	int ret;
> +	u8 sr_written;
>  
>  	/* Keep the current value of the Status Register. */
>  	ret = spi_nor_read_sr(nor, sr_cr);
> @@ -2075,7 +2076,22 @@ static int spansion_no_read_cr_quad_enable(struct spi_nor *nor)
>  
>  	sr_cr[1] = CR_QUAD_EN_SPAN;
>  
> -	return spi_nor_write_sr(nor, sr_cr, 2);
> +	ret = spi_nor_write_sr(nor, sr_cr, 2);
> +	if (ret)
> +		return ret;
> +
> +	sr_written = sr_cr[0];
> +
> +	ret = spi_nor_read_sr(nor, sr_cr);
> +	if (ret)
> +		return ret;
> +
> +	if (sr_cr[0] != sr_written) {
> +		dev_err(nor->dev, "SR: Read back test failed\n");
> +		return -EIO;
> +	}
> +
> +	return 0;
>  }
>  
>  /**
> @@ -2116,6 +2132,17 @@ static int spansion_read_cr_quad_enable(struct spi_nor *nor)
>  	if (ret)
>  		return ret;
>  
> +	sr_written = sr_cr[0];
> +
> +	ret = spi_nor_read_sr(nor, sr_cr);
> +	if (ret)
> +		return ret;
> +
> +	if (sr_written != sr_cr[0]) {
> +		dev_err(nor->dev, "SR: Read back test failed\n");
> +		return -EIO;
> +	}
> +
>  	sr_written = sr_cr[1];
>  
>  	/* Read back and check it. */
> 

-- 
Regards
Vignesh

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