linux-kernel - Re: [PATCH] mtd: spi-nor: Lower the priority of the software reset failure message

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Message-ID: <mafs07cnin59q.fsf@kernel.org>
Date:   Thu, 19 Oct 2023 14:52:33 +0200
From:   Pratyush Yadav <pratyush@...nel.org>
To:     AceLan Kao <acelan.kao@...onical.com>
Cc:     Tudor Ambarus <tudor.ambarus@...aro.org>,
        Pratyush Yadav <pratyush@...nel.org>,
        Michael Walle <michael@...le.cc>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mtd: spi-nor: Lower the priority of the software reset
 failure message

On Thu, Oct 19 2023, AceLan Kao wrote:

> From: "Chia-Lin Kao (AceLan)" <acelan.kao@...onical.com>
>
> Not all SPI drivers support soft reset enable and soft reset commands.
> This failure is expected and not critical. Thus, we avoid reporting it
> to regular users to prevent potential confusion regarding power-off issues.

No, failure to soft reset can very much be critical in certain cases.
For example, if you are operating the flash in 8D-8D-8D mode and do not
have the hard reset line connected, the bootloader (or the kernel) would
be unable to detect or operate the flash after a warm reboot.

Perhaps it makes sense to just call it when SNOR_F_BROKEN_RESET is set?
This way you do not unnecessarily call it when you do not need to, and
won't see the error message.

>
> Signed-off-by: Chia-Lin Kao (AceLan) <acelan.kao@...onical.com>
> ---
>  drivers/mtd/spi-nor/core.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
> index 1b0c6770c14e..7bca8ffcd756 100644
> --- a/drivers/mtd/spi-nor/core.c
> +++ b/drivers/mtd/spi-nor/core.c
> @@ -3252,7 +3252,7 @@ static void spi_nor_soft_reset(struct spi_nor *nor)
>  
>  	ret = spi_mem_exec_op(nor->spimem, &op);
>  	if (ret) {
> -		dev_warn(nor->dev, "Software reset failed: %d\n", ret);
> +		dev_info(nor->dev, "Software reset failed: %d\n", ret);
>  		return;
>  	}
>  
> @@ -3262,7 +3262,7 @@ static void spi_nor_soft_reset(struct spi_nor *nor)
>  
>  	ret = spi_mem_exec_op(nor->spimem, &op);
>  	if (ret) {
> -		dev_warn(nor->dev, "Software reset failed: %d\n", ret);
> +		dev_info(nor->dev, "Software reset failed: %d\n", ret);
>  		return;
>  	}

-- 
Regards,
Pratyush Yadav