linux-kernel - Re: [PATCH 2/2] mtd: m25p80: restore the addressing mode when stop using the flash

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Date:   Fri, 1 Dec 2017 09:57:44 +0100
From:   Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>
To:     Zhiqiang Hou <Zhiqiang.Hou@....com>, linux-mtd@...ts.infradead.org,
        linux-kernel@...r.kernel.org, computersforpeace@...il.com,
        dwmw2@...radead.org, boris.brezillon@...e-electrons.com,
        marek.vasut@...il.com, richard@....at
Subject: Re: [PATCH 2/2] mtd: m25p80: restore the addressing mode when stop
 using the flash

Hi Hou,

Le 24/11/2017 à 11:08, Zhiqiang Hou a écrit :
> From: Hou Zhiqiang <Zhiqiang.Hou@....com>
> 
> Add .shutdown function to restore the addressing mode in reboot
> process, and add the same operation to the .remove function.
> 
> Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@....com>
> ---
>  drivers/mtd/devices/m25p80.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
> index dbe6a1de2bb8..867bd2d5a267 100644
> --- a/drivers/mtd/devices/m25p80.c
> +++ b/drivers/mtd/devices/m25p80.c
> @@ -307,10 +307,17 @@ static int m25p_remove(struct spi_device *spi)
>  {
>  	struct m25p	*flash = spi_get_drvdata(spi);
>  
> +	spi_nor_restore_addr_mode(&flash->spi_nor);

maybe add a new line here.

Otherwise, this looks good :)

Best regards,

Cyrille

>  	/* Clean up MTD stuff. */
>  	return mtd_device_unregister(&flash->spi_nor.mtd);
>  }
>  
> +static void m25p_shutdown(struct spi_device *spi)
> +{
> +	struct m25p *flash = spi_get_drvdata(spi);
> +
> +	spi_nor_restore_addr_mode(&flash->spi_nor);
> +}
>  /*
>   * Do NOT add to this array without reading the following:
>   *
> @@ -386,6 +393,7 @@ static struct spi_driver m25p80_driver = {
>  	.id_table	= m25p_ids,
>  	.probe	= m25p_probe,
>  	.remove	= m25p_remove,
> +	.shutdown	= m25p_shutdown,
>  
>  	/* REVISIT: many of these chips have deep power-down modes, which
>  	 * should clearly be entered on suspend() to minimize power use.
>