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

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Date:   Thu, 10 Jun 2021 20:02:08 +0800
From:   Yong Wu <yong.wu@...iatek.com>
To:     Matthias Brugger <matthias.bgg@...il.com>
CC:     Hsin-Yi Wang <hsinyi@...omium.org>, 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>,
        <linux-media@...r.kernel.org>
Subject: Re: [PATCH v5 13/16] media: mtk-vcodec: Get rid of
 mtk_smi_larb_get/put

On Thu, 2021-06-10 at 09:53 +0200, Matthias Brugger wrote:
> Hi Yong,
> 
> On 12/05/2021 14:29, Yong Wu wrote:
> > 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.
> > 
> 
> Please also make sure that you add all maintainers. I realized that at least for
> the media/platform drivers we miss the maintainer and the corresponding mailing
> list.
> This is especially important in this series, as it spans several subsystems.

Thanks for hint. I only added the file maintainer here. I will add
linux-media in next version.

By the way, this patchset cross several trees, then which tree should it
go through. Do you have some suggestion?

> 
> Thanks a lot,
> Matthias
> 
> >>
> >>> -
> >>>  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
> >>>
> >