From: Sylwester Nawrocki <s.nawrocki@samsung.com>
To: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Cc: linuxarm@huawei.com, mauro.chehab@huawei.com,
Ezequiel Garcia <ezequiel@collabora.com>,
Hans Verkuil <hverkuil-cisco@xs4all.nl>,
Krzysztof Kozlowski <krzk@kernel.org>,
Mauro Carvalho Chehab <mchehab@kernel.org>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-media@vger.kernel.org,
linux-samsung-soc@vger.kernel.org
Subject: Re: [PATCH v3 06/79] media: exynos-gsc: don't resume at remove time
Date: Tue, 27 Apr 2021 13:21:32 +0200 [thread overview]
Message-ID: <5aab0e11-6818-990b-f583-35036c1bb740@samsung.com> (raw)
In-Reply-To: <a561d9eb253076cbcb9debe5fcbd3c949d5023d2.1619519080.git.mchehab+huawei@kernel.org>
On 27.04.2021 12:25, Mauro Carvalho Chehab 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, simplify the code by getting rid of that.
>
> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
> ---
> drivers/media/platform/exynos-gsc/gsc-core.c | 3 ---
> 1 file changed, 3 deletions(-)
>
> diff --git a/drivers/media/platform/exynos-gsc/gsc-core.c b/drivers/media/platform/exynos-gsc/gsc-core.c
> index 9f41c2e7097a..70e86cdc1012 100644
> --- a/drivers/media/platform/exynos-gsc/gsc-core.c
> +++ b/drivers/media/platform/exynos-gsc/gsc-core.c
> @@ -1210,8 +1210,6 @@ 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);
>
> @@ -1219,7 +1217,6 @@ static int gsc_remove(struct platform_device *pdev)
> 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);
This will result in unbalanced clk_disable_unprepare() calls when
the device is not runtime PM active at the time of gsc_remove() call.
I think we need to first disable runtime PM for the device and then
disable the clocks only when pm_runtime_status_suspended(&pdev->dev)
returns false.
Thanks,
Sylwester
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next prev parent reply other threads:[~2021-04-27 11:23 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <cover.1619519080.git.mchehab+huawei@kernel.org>
2021-04-27 10:25 ` [PATCH v3 06/79] media: exynos-gsc: don't resume at remove time Mauro Carvalho Chehab
2021-04-27 11:21 ` Sylwester Nawrocki [this message]
2021-04-27 10:25 ` [PATCH v3 07/79] media: atmel: properly get pm_runtime Mauro Carvalho Chehab
2021-04-27 10:25 ` [PATCH v3 09/79] media: mdk-mdp: fix pm_runtime_get_sync() usage count Mauro Carvalho Chehab
2021-04-27 10:26 ` [PATCH v3 11/79] media: rga-buf: use pm_runtime_resume_and_get() Mauro Carvalho Chehab
2021-04-28 17:10 ` Ezequiel Garcia
2021-04-27 10:26 ` [PATCH v3 16/79] media: mtk-vcodec: fix pm_runtime_get_sync() usage count Mauro Carvalho Chehab
2021-04-27 10:26 ` [PATCH v3 17/79] media: s5p-jpeg: " Mauro Carvalho Chehab
2021-04-27 12:36 ` Andrzej Pietrasiewicz
2021-04-27 10:26 ` [PATCH v3 19/79] media: sun8i_rotate: " Mauro Carvalho Chehab
2021-04-27 10:26 ` [PATCH v3 22/79] staging: media: imx7-mipi-csis: use pm_runtime_resume_and_get() Mauro Carvalho Chehab
2021-04-27 10:26 ` [PATCH v3 24/79] staging: media: cedrus_video: " Mauro Carvalho Chehab
2021-04-27 10:26 ` [PATCH v3 62/79] media: exynos4-is: " Mauro Carvalho Chehab
2021-04-27 10:45 ` Sylwester Nawrocki
2021-04-27 10:26 ` [PATCH v3 63/79] media: exynos-gsc: " Mauro Carvalho Chehab
2021-04-27 10:47 ` Sylwester Nawrocki
2021-04-27 10:26 ` [PATCH v3 64/79] media: mtk-jpeg: " Mauro Carvalho Chehab
2021-04-27 10:27 ` [PATCH v3 70/79] media: rkisp1: " Mauro Carvalho Chehab
2021-04-27 10:27 ` [PATCH v3 72/79] media: s5p-mfc: " Mauro Carvalho Chehab
2021-04-27 10:27 ` [PATCH v3 74/79] media: stm32: " Mauro Carvalho Chehab
2021-04-27 10:27 ` [PATCH v3 75/79] media: sunxi: " Mauro Carvalho Chehab
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