Re: [PATCH 07/25] media: exynos-gsc: don't resume at remove time

[Jonathan Cameron]

On Wed, 5 May 2021 11:41:57 +0200
Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx> wrote:

> Calling pm_runtime_get_sync() at driver's removal time is not
> needed, as this will resume PM runtime. Also, the PM runtime
> code at pm_runtime_disable() already calls it, if it detects
> the need.
> 
> So, change the logic in order to disable PM runtime earlier.
> 
> Reviewed-by: Sylwester Nawrocki <s.nawrocki@xxxxxxxxxxx>
> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx>
Seems sensible and a lot more along the lines of what I'd expect
to see than was originally here.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>

> ---
>  drivers/media/platform/exynos-gsc/gsc-core.c | 11 ++++++-----
>  1 file changed, 6 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/media/platform/exynos-gsc/gsc-core.c b/drivers/media/platform/exynos-gsc/gsc-core.c
> index 9f41c2e7097a..f49f3322f835 100644
> --- a/drivers/media/platform/exynos-gsc/gsc-core.c
> +++ b/drivers/media/platform/exynos-gsc/gsc-core.c
> @@ -1210,18 +1210,19 @@ static int gsc_remove(struct platform_device *pdev)
>  	struct gsc_dev *gsc = platform_get_drvdata(pdev);
>  	int i;
>  
> -	pm_runtime_get_sync(&pdev->dev);
> -
>  	gsc_unregister_m2m_device(gsc);
>  	v4l2_device_unregister(&gsc->v4l2_dev);
>  
>  	vb2_dma_contig_clear_max_seg_size(&pdev->dev);
> -	for (i = 0; i < gsc->num_clocks; i++)
> -		clk_disable_unprepare(gsc->clock[i]);
>  
> -	pm_runtime_put_noidle(&pdev->dev);
>  	pm_runtime_disable(&pdev->dev);
>  
> +	if (!pm_runtime_status_suspended(&pdev->dev))
> +		for (i = 0; i < gsc->num_clocks; i++)
> +			clk_disable_unprepare(gsc->clock[i]);
> +
> +	pm_runtime_set_suspended(&pdev->dev);
> +
>  	dev_dbg(&pdev->dev, "%s driver unloaded\n", pdev->name);
>  	return 0;
>  }