Re: [PATCH v8 09/12] media: mtk-vcodec: Get rid of mtk_smi_larb_get/put

From: Yong Wu <yong.wu@mediatek.com>
To: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	Joerg Roedel <joro@8bytes.org>, Rob Herring <robh+dt@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>,
	David Airlie <airlied@linux.ie>,
	"Mauro Carvalho Chehab" <mchehab@kernel.org>
Cc: Evan Green <evgreen@chromium.org>,
	Robin Murphy <robin.murphy@arm.com>,
	Tomasz Figa <tfiga@chromium.org>,
	Will Deacon <will.deacon@arm.com>,
	<linux-mediatek@lists.infradead.org>,
	<srv_heupstream@mediatek.com>, <devicetree@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>,
	<linux-arm-kernel@lists.infradead.org>,
	<iommu@lists.linux-foundation.org>, <youlin.pei@mediatek.com>,
	Matthias Kaehlcke <mka@chromium.org>, <anan.sun@mediatek.com>,
	<yi.kuo@mediatek.com>, <acourbot@chromium.org>,
	<linux-media@vger.kernel.org>, <dri-devel@lists.freedesktop.org>,
	"Daniel Vetter" <daniel@ffwll.ch>,
	Chun-Kuang Hu <chunkuang.hu@kernel.org>,
	"Philipp Zabel" <p.zabel@pengutronix.de>,
	Tiffany Lin <tiffany.lin@mediatek.com>,
	Hsin-Yi Wang <hsinyi@chromium.org>,
	Eizan Miyamoto <eizan@chromium.org>, <anthony.huang@mediatek.com>,
	Frank Wunderlich <frank-w@public-files.de>,
	Irui Wang <irui.wang@mediatek.com>
Subject: Re: [PATCH v8 09/12] media: mtk-vcodec: Get rid of mtk_smi_larb_get/put
Date: Thu, 7 Oct 2021 10:57:01 +0800	[thread overview]
Message-ID: <7703076927822fc31d1af37f8fd3bfe5e0513d29.camel@mediatek.com> (raw)
In-Reply-To: <f9829a5a-984c-bced-0286-53f9edc8ae3d@collabora.com>

On Thu, 2021-09-30 at 12:57 +0200, Dafna Hirschfeld wrote:
> 
> On 30.09.21 05:28, Yong Wu wrote:
> > Hi Dafna,
> > 
> > Thanks very much for the review.
> > 
> > On Wed, 2021-09-29 at 14:13 +0200, Dafna Hirschfeld wrote:
> > > 
> > > On 29.09.21 03:37, Yong Wu wrote:
> > > > MediaTek IOMMU has already added the device_link between the
> > > > consumer
> > > > and smi-larb device. If the vcodec device call the
> > > > pm_runtime_get_sync,
> > > > the smi-larb's pm_runtime_get_sync also be called
> > > > automatically.
> > > > 
> > > > CC: Tiffany Lin <tiffany.lin@mediatek.com>
> > > > CC: Irui Wang <irui.wang@mediatek.com>
> > > > Signed-off-by: Yong Wu <yong.wu@mediatek.com>
> > > > Reviewed-by: Evan Green <evgreen@chromium.org>
> > > > Acked-by: Tiffany Lin <tiffany.lin@mediatek.com>
> > > > Reviewed-by: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>
> > > > ---
> > > >    .../platform/mtk-vcodec/mtk_vcodec_dec_pm.c   | 37 +++----
> > > > -------
> > > > --
> > > >    .../platform/mtk-vcodec/mtk_vcodec_drv.h      |  3 --
> > > >    .../platform/mtk-vcodec/mtk_vcodec_enc.c      |  1 -
> > > >    .../platform/mtk-vcodec/mtk_vcodec_enc_pm.c   | 44 +++----
> > > > -------

[snip]

> > > >    void mtk_vcodec_release_dec_pm(struct mtk_vcodec_dev *dev)
> > > >    {
> > > >    	pm_runtime_disable(dev->pm.dev);
> > > > -	put_device(dev->pm.larbvdec);
> > > >    }
> > > 
> > > Now that functions only do  'pm_runtime_disable(dev->pm.dev);' so
> > > it
> > > will be more
> > > readable to remove the function mtk_vcodec_release_dec_pm
> > > and replace with pm_runtime_disable(dev->pm.dev);
> > > Same for the 'enc' equivalent.
> > 
> > Make sense. But It may be not proper if using pm_runtime_disable
> > as the symmetry with mtk_vcodec_init_dec_pm in the
> > mtk_vcodec_probe.
> > 
> > Maybe we should move pm_runtime_enable out from
> > mtk_vcodec_init_dec_pm
> > into mtk_vcodec_probe. I could do a new patch for this. Is this ok
> > for
> > you?
> 
> yes, there is also asymettry when calling pm_runtime* in general,
> I see in the decoder it is called from mtk_vcodec_dec_pm.c
> but in the encoder it is called from mtk_vcodec_enc.c,
> 
> I think all calls to pm_runtime* should be out of the *_pm.c files

OK. I will try this.

> since for example 'mtk_vcodec_dec_pw_on' also do just one call to
> pm_runtime_resume_and_get so this function can also be removed.

I guess this one should be reserved to vcodec guys. I see this function
is changed at [1]. Let's keep this patchset clean.

[1] 
https://patchwork.kernel.org/project/linux-mediatek/patch/20210901083215.25984-10-yunfei.dong@mediatek.com/

> 
> thanks,
> Dafna
> 
> > 
> > > 
> > > Thanks,
> > > Dafna
> > 
> > [snip]
> > _______________________________________________
> > Linux-mediatek mailing list
> > Linux-mediatek@lists.infradead.org
> > http://lists.infradead.org/mailman/listinfo/linux-mediatek
> > 
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