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

From: Pratyush Yadav <pratyush@kernel.org>
To: AceLan Kao <acelan.kao@canonical.com>
Cc: Tudor Ambarus <tudor.ambarus@linaro.org>,
	 Pratyush Yadav <pratyush@kernel.org>,
	 Michael Walle <michael@walle.cc>,
	 Miquel Raynal <miquel.raynal@bootlin.com>,
	 Richard Weinberger <richard@nod.at>,
	Vignesh Raghavendra <vigneshr@ti.com>,
	 linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] mtd: spi-nor: Lower the priority of the software reset failure message
Date: Thu, 19 Oct 2023 14:52:33 +0200	[thread overview]
Message-ID: <mafs07cnin59q.fsf@kernel.org> (raw)
In-Reply-To: <20231019064547.348446-1-acelan.kao@canonical.com> (AceLan Kao's message of "Thu, 19 Oct 2023 14:45:47 +0800")

On Thu, Oct 19 2023, AceLan Kao wrote:

> From: "Chia-Lin Kao (AceLan)" <acelan.kao@canonical.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@canonical.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

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