linux-kernel - Re: [PATCH v5 13/16] media: mtk-vcodec: Get rid of mtk_smi_larb

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Date:   Wed, 12 May 2021 20:29:07 +0800
From:   Yong Wu <yong.wu@...iatek.com>
To:     Hsin-Yi Wang <hsinyi@...omium.org>
CC:     Matthias Brugger <matthias.bgg@...il.com>,
        Joerg Roedel <joro@...tes.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Evan Green <evgreen@...omium.org>,
        Robin Murphy <robin.murphy@....com>,
        Tomasz Figa <tfiga@...omium.org>,
        Will Deacon <will.deacon@....com>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        <srv_heupstream@...iatek.com>,
        Devicetree List <devicetree@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        <iommu@...ts.linux-foundation.org>, <youlin.pei@...iatek.com>,
        Nicolas Boichat <drinkcat@...omium.org>,
        Matthias Kaehlcke <mka@...omium.org>, <anan.sun@...iatek.com>,
        <chao.hao@...iatek.com>, <ming-fan.chen@...iatek.com>,
        <yi.kuo@...iatek.com>, <eizan@...omium.org>,
        Alexandre Courbot <acourbot@...omium.org>,
        Tiffany Lin <tiffany.lin@...iatek.com>,
        Irui Wang <irui.wang@...iatek.com>
Subject: Re: [PATCH v5 13/16] media: mtk-vcodec: Get rid of
 mtk_smi_larb_get/put

On Wed, 2021-05-12 at 17:20 +0800, Hsin-Yi Wang wrote:
> On Sat, Apr 10, 2021 at 5:14 PM Yong Wu <yong.wu@...iatek.com> 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@...iatek.com>
> > CC: Irui Wang <irui.wang@...iatek.com>
> > Signed-off-by: Yong Wu <yong.wu@...iatek.com>
> > Reviewed-by: Evan Green <evgreen@...omium.org>
> > Acked-by: Tiffany Lin <tiffany.lin@...iatek.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   | 46 ++-----------------
> >  4 files changed, 10 insertions(+), 77 deletions(-)

[...]

> > @@ -108,13 +80,6 @@ void mtk_vcodec_enc_clock_on(struct mtk_vcodec_pm *pm)
> >                 }
> >         }
> >
> > -       ret = mtk_smi_larb_get(pm->larbvenc);
> > -       if (ret) {
> > -               mtk_v4l2_err("mtk_smi_larb_get larb3 fail %d", ret);
> > -               goto clkerr;
> > -       }
> > -       return;
> 
> You can't delete the return; here, otherwise vcodec_clk will be turned
> off immediately after they are turned on.

Thanks very much for your review.

Sorry for this. You are quite right.

I checked this, it was introduced in v4 when I rebase the code. I will
fix it in next time.

> 
> > -
> >  clkerr:
> >         for (i -= 1; i >= 0; i--)
> >                 clk_disable_unprepare(enc_clk->clk_info[i].vcodec_clk);
> > @@ -125,7 +90,6 @@ void mtk_vcodec_enc_clock_off(struct mtk_vcodec_pm *pm)
> >         struct mtk_vcodec_clk *enc_clk = &pm->venc_clk;
> >         int i = 0;
> >
> > -       mtk_smi_larb_put(pm->larbvenc);
> >         for (i = enc_clk->clk_num - 1; i >= 0; i--)
> >                 clk_disable_unprepare(enc_clk->clk_info[i].vcodec_clk);
> >  }
> > --
> > 2.18.0
> >