linux-kernel - Re: [PATCH 1/2] media: imx-mipi-csis: Fix clock handling in remove()

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Date:   Wed, 22 Nov 2023 16:56:15 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Cc:     Kieran Bingham <kieran.bingham@...asonboard.com>,
        Rui Miguel Silva <rmfrfs@...il.com>,
        Martin Kepplinger <martink@...teo.de>,
        Purism Kernel Team <kernel@...i.sm>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        linux-media@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] media: imx-mipi-csis: Fix clock handling in remove()

Hi Tomi,

Thank you for the patch.

On Wed, Nov 22, 2023 at 03:13:48PM +0200, Tomi Valkeinen wrote:
> The driver always calls mipi_csis_runtime_suspend() and
> mipi_csis_clk_disable() in remove(). This causes multiple WARNs from the
> kernel, as the clocks get disabled too many times.

Did you try to unload the driver ? What a weird idea :-)

> Fix the remove() to call mipi_csis_runtime_suspend() and
> mipi_csis_clk_disable() in a way that reverses what is done in probe().
> 
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

> ---
>  drivers/media/platform/nxp/imx-mipi-csis.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/platform/nxp/imx-mipi-csis.c b/drivers/media/platform/nxp/imx-mipi-csis.c
> index 6cb20b45e0a1..b39d7aeba750 100644
> --- a/drivers/media/platform/nxp/imx-mipi-csis.c
> +++ b/drivers/media/platform/nxp/imx-mipi-csis.c
> @@ -1502,8 +1502,10 @@ static void mipi_csis_remove(struct platform_device *pdev)
>  	v4l2_async_nf_cleanup(&csis->notifier);
>  	v4l2_async_unregister_subdev(&csis->sd);
>  
> +	if (!pm_runtime_enabled(&pdev->dev))
> +		mipi_csis_runtime_suspend(&pdev->dev);
> +
>  	pm_runtime_disable(&pdev->dev);
> -	mipi_csis_runtime_suspend(&pdev->dev);
>  	mipi_csis_clk_disable(csis);
>  	v4l2_subdev_cleanup(&csis->sd);
>  	media_entity_cleanup(&csis->sd.entity);
> 

-- 
Regards,

Laurent Pinchart