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From: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
To: Jonathan Cameron <Jonathan.Cameron@Huawei.com>
Cc: <linuxarm@huawei.com>, <mauro.chehab@huawei.com>,
	Benoit Parrot <bparrot@ti.com>,
	Mauro Carvalho Chehab <mchehab@kernel.org>,
	<linux-kernel@vger.kernel.org>, <linux-media@vger.kernel.org>
Subject: Re: [PATCH v4 75/79] media: ti-vpe: use pm_runtime_resume_and_get()
Date: Mon, 3 May 2021 14:49:25 +0200	[thread overview]
Message-ID: <20210503144925.05b56132@coco.lan> (raw)
In-Reply-To: <20210430190311.000039eb@Huawei.com>

Em Fri, 30 Apr 2021 19:03:11 +0100
Jonathan Cameron <Jonathan.Cameron@Huawei.com> escreveu:

> On Wed, 28 Apr 2021 16:52:36 +0200
> Mauro Carvalho Chehab <mchehab+huawei@kernel.org> wrote:

> > diff --git a/drivers/media/platform/ti-vpe/vpe.c b/drivers/media/platform/ti-vpe/vpe.c
> > index 10251b787674..07cb2c140295 100644
> > --- a/drivers/media/platform/ti-vpe/vpe.c
> > +++ b/drivers/media/platform/ti-vpe/vpe.c
> > @@ -2471,10 +2471,8 @@ static int vpe_runtime_get(struct platform_device *pdev)
> >  
> >  	dev_dbg(&pdev->dev, "vpe_runtime_get\n");
> >  
> > -	r = pm_runtime_get_sync(&pdev->dev);
> > +	r = pm_runtime_resume_and_get(&pdev->dev);
> >  	WARN_ON(r < 0);
> > -	if (r)
> > -		pm_runtime_put_noidle(&pdev->dev);
> >  	return r < 0 ? r : 0;  
> r is <= 0 to zero so this isn't doing anything useful.

Not really. pm_runtime*get* routines may return positive values
as well. From Documentation/power/runtime_pm.rst:

  `int pm_runtime_resume(struct device *dev);`
    - execute the subsystem-level resume callback for the device; returns 0 on
      success, 1 if the device's runtime PM status was already 'active' or
      error code on failure, where -EAGAIN means it may be safe to attempt to
      resume the device again in future, but 'power.runtime_error' should be
      checked additionally, and -EACCES means that 'power.disable_depth' is
      different from 0

  `int pm_runtime_resume_and_get(struct device *dev);`
    - run pm_runtime_resume(dev) and if successful, increment the device's
      usage counter; return the result of pm_runtime_resume

  `int pm_runtime_get_sync(struct device *dev);`
    - increment the device's usage counter, run pm_runtime_resume(dev) and
      return its result

So, basically, if the device was already active, it would return 1.

Now, this is called as:

        ret = vpe_runtime_get(pdev);
        if (ret)
                goto rel_m2m;

So the logic could be simplified if the caller would be
doing, instead:

        ret = vpe_runtime_get(pdev);
        if (ret < 0)
                goto rel_m2m;

I'll do such change for the next version.

Thanks,
Mauro

  reply	other threads:[~2021-05-03 12:49 UTC|newest]

Thread overview: 128+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-28 14:51 [PATCH v4 00/79] Address some issues with PM runtime at media subsystem Mauro Carvalho Chehab
2021-04-28 14:51 ` [PATCH v4 01/79] media: venus: fix PM runtime logic at venus_sys_error_handler() Mauro Carvalho Chehab
2021-04-30 15:21   ` Jonathan Cameron
2021-05-03  9:00     ` Mauro Carvalho Chehab
2021-04-28 14:51 ` [PATCH v4 02/79] media: s6p_cec: decrement usage count if disabled Mauro Carvalho Chehab
2021-04-28 15:31   ` Sylwester Nawrocki
2021-04-28 14:51 ` [PATCH v4 03/79] media: i2c: ccs-core: return the right error code at suspend Mauro Carvalho Chehab
2021-04-28 14:51 ` [PATCH v4 04/79] media: i2c: ov7740: don't resume at remove time Mauro Carvalho Chehab
2021-04-28 14:51 ` [PATCH v4 05/79] media: i2c: video-i2c: " Mauro Carvalho Chehab
2021-04-28 14:51 ` [PATCH v4 06/79] media: i2c: imx334: fix the pm runtime get logic Mauro Carvalho Chehab
2021-04-30 15:54   ` Jonathan Cameron
2021-04-28 14:51 ` [PATCH v4 07/79] media: exynos-gsc: don't resume at remove time Mauro Carvalho Chehab
2021-04-28 15:25   ` Sylwester Nawrocki
2021-04-28 19:44   ` kernel test robot
2021-04-28 19:56   ` kernel test robot
2021-04-28 14:51 ` [PATCH v4 08/79] media: atmel: properly get pm_runtime Mauro Carvalho Chehab
2021-04-30 16:13   ` Jonathan Cameron
2021-04-28 14:51 ` [PATCH v4 09/79] media: marvel-ccic: fix some issues when getting pm_runtime Mauro Carvalho Chehab
2021-04-30 16:29   ` Jonathan Cameron
2021-04-28 14:51 ` [PATCH v4 10/79] media: mdk-mdp: fix pm_runtime_get_sync() usage count Mauro Carvalho Chehab
2021-04-30 16:30   ` Jonathan Cameron
2021-04-28 14:51 ` [PATCH v4 11/79] media: rcar_fdp1: " Mauro Carvalho Chehab
2021-04-30 16:26   ` Jonathan Cameron
2021-04-28 14:51 ` [PATCH v4 12/79] media: renesas-ceu: Properly check for PM errors Mauro Carvalho Chehab
2021-04-30 16:28   ` Jonathan Cameron
2021-04-28 14:51 ` [PATCH v4 13/79] media: s5p: fix pm_runtime_get_sync() usage count Mauro Carvalho Chehab
2021-04-28 14:51 ` [PATCH v4 14/79] media: am437x: " Mauro Carvalho Chehab
2021-04-30 16:36   ` Jonathan Cameron
2021-05-04  7:19     ` Mauro Carvalho Chehab
2021-04-28 14:51 ` [PATCH v4 15/79] media: sh_vou: " Mauro Carvalho Chehab
2021-04-30 16:40   ` Jonathan Cameron
2021-04-28 14:51 ` [PATCH v4 16/79] media: mtk-vcodec: " Mauro Carvalho Chehab
2021-04-30 16:44   ` Jonathan Cameron
2021-04-28 14:51 ` [PATCH v4 17/79] media: s5p-jpeg: " Mauro Carvalho Chehab
2021-04-28 14:51 ` [PATCH v4 18/79] media: sti/delta: " Mauro Carvalho Chehab
2021-04-30 16:47   ` Jonathan Cameron
2021-04-28 14:51 ` [PATCH v4 19/79] media: sunxi: " Mauro Carvalho Chehab
2021-04-30 16:48   ` Jonathan Cameron
2021-04-28 14:51 ` [PATCH v4 20/79] staging: media: rkvdec: " Mauro Carvalho Chehab
2021-04-28 15:09   ` Johan Hovold
2021-04-29  7:38     ` Mauro Carvalho Chehab
2021-04-28 14:51 ` [PATCH v4 21/79] staging: media: atomisp: use pm_runtime_resume_and_get() Mauro Carvalho Chehab
2021-04-30 16:59   ` Jonathan Cameron
2021-04-28 14:51 ` [PATCH v4 22/79] staging: media: imx7-mipi-csis: " Mauro Carvalho Chehab
2021-04-28 14:51 ` [PATCH v4 23/79] staging: media: ipu3: " Mauro Carvalho Chehab
2021-04-30 17:03   ` Jonathan Cameron
2021-05-03  9:57     ` Johan Hovold
2021-04-28 14:51 ` [PATCH v4 24/79] staging: media: cedrus_video: " Mauro Carvalho Chehab
2021-04-30 17:05   ` Jonathan Cameron
2021-04-28 14:51 ` [PATCH v4 25/79] staging: media: tegra-vde: " Mauro Carvalho Chehab
2021-04-29 12:38   ` Dmitry Osipenko
2021-04-30 17:08   ` Jonathan Cameron
2021-04-30 17:11     ` Jonathan Cameron
2021-04-28 14:51 ` [PATCH v4 26/79] staging: media: tegra-video: " Mauro Carvalho Chehab
2021-04-30 17:13   ` Jonathan Cameron
2021-04-28 14:51 ` [PATCH v4 27/79] media: i2c: ak7375: " Mauro Carvalho Chehab
2021-04-30 17:14   ` Jonathan Cameron
2021-04-28 14:51 ` [PATCH v4 28/79] media: i2c: ccs-core: " Mauro Carvalho Chehab
2021-04-28 14:51 ` [PATCH v4 29/79] media: i2c: dw9714: " Mauro Carvalho Chehab
2021-04-28 14:51 ` [PATCH v4 30/79] media: i2c: dw9768: " Mauro Carvalho Chehab
2021-04-28 14:51 ` [PATCH v4 31/79] media: i2c: dw9807-vcm: " Mauro Carvalho Chehab
2021-04-28 14:51 ` [PATCH v4 32/79] media: i2c: hi556: " Mauro Carvalho Chehab
2021-04-28 14:51 ` [PATCH v4 33/79] media: i2c: imx214: " Mauro Carvalho Chehab
2021-04-28 14:51 ` [PATCH v4 34/79] media: i2c: imx219: " Mauro Carvalho Chehab
2021-04-28 14:51 ` [PATCH v4 35/79] media: i2c: imx258: " Mauro Carvalho Chehab
2021-04-28 14:51 ` [PATCH v4 36/79] media: i2c: imx274: " Mauro Carvalho Chehab
2021-04-28 14:51 ` [PATCH v4 37/79] media: i2c: imx290: " Mauro Carvalho Chehab
2021-04-28 14:51 ` [PATCH v4 38/79] media: i2c: imx319: " Mauro Carvalho Chehab
2021-04-28 14:52 ` [PATCH v4 39/79] media: i2c: imx355: " Mauro Carvalho Chehab
2021-04-28 14:52 ` [PATCH v4 40/79] media: i2c: mt9m001: " Mauro Carvalho Chehab
2021-04-28 14:52 ` [PATCH v4 41/79] media: i2c: ov02a10: " Mauro Carvalho Chehab
2021-04-28 14:52 ` [PATCH v4 42/79] media: i2c: ov13858: " Mauro Carvalho Chehab
2021-04-28 14:52 ` [PATCH v4 43/79] media: i2c: ov2659: " Mauro Carvalho Chehab
2021-05-03 12:30   ` Lad, Prabhakar
2021-04-28 14:52 ` [PATCH v4 44/79] media: i2c: ov2685: " Mauro Carvalho Chehab
2021-04-28 14:52 ` [PATCH v4 45/79] media: i2c: ov2740: " Mauro Carvalho Chehab
2021-04-30 17:20   ` Jonathan Cameron
2021-04-28 14:52 ` [PATCH v4 46/79] media: i2c: ov5647: " Mauro Carvalho Chehab
2021-04-28 14:52 ` [PATCH v4 47/79] media: i2c: ov5648: " Mauro Carvalho Chehab
2021-04-28 14:52 ` [PATCH v4 48/79] media: i2c: ov5670: " Mauro Carvalho Chehab
2021-04-28 14:52 ` [PATCH v4 49/79] media: i2c: ov5675: " Mauro Carvalho Chehab
2021-04-28 14:52 ` [PATCH v4 50/79] media: i2c: ov5695: " Mauro Carvalho Chehab
2021-04-28 14:52 ` [PATCH v4 51/79] media: i2c: ov7740: " Mauro Carvalho Chehab
2021-04-28 14:52 ` [PATCH v4 52/79] media: i2c: ov8856: " Mauro Carvalho Chehab
2021-04-28 14:52 ` [PATCH v4 53/79] media: i2c: ov8865: " Mauro Carvalho Chehab
2021-04-28 14:52 ` [PATCH v4 54/79] media: i2c: ov9734: " Mauro Carvalho Chehab
2021-04-28 14:52 ` [PATCH v4 55/79] media: i2c: tvp5150: " Mauro Carvalho Chehab
2021-04-28 14:52 ` [PATCH v4 56/79] media: i2c: video-i2c: " Mauro Carvalho Chehab
2021-04-28 14:52 ` [PATCH v4 57/79] media: rockchip/rga: " Mauro Carvalho Chehab
2021-04-28 17:11   ` Ezequiel Garcia
2021-04-28 14:52 ` [PATCH v4 58/79] media: sti/hva: " Mauro Carvalho Chehab
2021-04-30 17:35   ` Jonathan Cameron
2021-04-28 14:52 ` [PATCH v4 59/79] media: sti/bdisp: " Mauro Carvalho Chehab
2021-04-28 14:52 ` [PATCH v4 60/79] media: ipu3: " Mauro Carvalho Chehab
2021-04-28 14:52 ` [PATCH v4 61/79] media: coda: " Mauro Carvalho Chehab
2021-04-28 14:52 ` [PATCH v4 62/79] media: exynos4-is: " Mauro Carvalho Chehab
2021-04-30 17:49   ` Jonathan Cameron
2021-04-28 14:52 ` [PATCH v4 63/79] media: exynos-gsc: " Mauro Carvalho Chehab
2021-04-30 17:50   ` Jonathan Cameron
2021-04-28 14:52 ` [PATCH v4 64/79] media: mtk-jpeg: " Mauro Carvalho Chehab
2021-04-28 14:52 ` [PATCH v4 65/79] media: camss: " Mauro Carvalho Chehab
2021-04-28 14:52 ` [PATCH v4 66/79] media: venus: " Mauro Carvalho Chehab
2021-04-28 14:52 ` [PATCH v4 67/79] media: venus: vdec: " Mauro Carvalho Chehab
2021-04-30 17:53   ` Jonathan Cameron
2021-04-28 14:52 ` [PATCH v4 68/79] media: venus: venc: " Mauro Carvalho Chehab
2021-04-28 14:52 ` [PATCH v4 69/79] media: rcar-fcp: " Mauro Carvalho Chehab
2021-04-28 14:52 ` [PATCH v4 70/79] media: rkisp1: " Mauro Carvalho Chehab
2021-04-28 14:52 ` [PATCH v4 71/79] media: s3c-camif: " Mauro Carvalho Chehab
2021-04-28 14:52 ` [PATCH v4 72/79] media: s5p-mfc: " Mauro Carvalho Chehab
2021-04-28 14:52 ` [PATCH v4 73/79] media: stm32: " Mauro Carvalho Chehab
2021-04-30 17:58   ` Jonathan Cameron
2021-04-28 14:52 ` [PATCH v4 74/79] media: sunxi: " Mauro Carvalho Chehab
2021-04-28 14:52 ` [PATCH v4 75/79] media: ti-vpe: " Mauro Carvalho Chehab
2021-04-30 18:03   ` Jonathan Cameron
2021-05-03 12:49     ` Mauro Carvalho Chehab [this message]
2021-04-28 14:52 ` [PATCH v4 76/79] media: vsp1: " Mauro Carvalho Chehab
2021-04-28 14:52 ` [PATCH v4 77/79] media: rcar-vin: " Mauro Carvalho Chehab
2021-04-30 18:05   ` Jonathan Cameron
2021-04-28 14:52 ` [PATCH v4 78/79] media: hantro: " Mauro Carvalho Chehab
2021-04-28 17:14   ` Ezequiel Garcia
2021-04-30 18:09   ` Jonathan Cameron
2021-04-28 14:52 ` [PATCH v4 79/79] media: hantro: do a PM resume earlier Mauro Carvalho Chehab
2021-04-28 17:17   ` Ezequiel Garcia
2021-04-29  7:13     ` Mauro Carvalho Chehab
2021-04-28 15:50 ` [PATCH v4 00/79] Address some issues with PM runtime at media subsystem Johan Hovold
2021-04-29 10:18   ` Mauro Carvalho Chehab
2021-04-29 12:33     ` Dmitry Osipenko
2021-04-29 15:17     ` Johan Hovold

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