linux-kernel - Re: [PATCH 4/6] media: mediatek: vcodec: Revert driver name change in encoder capabilities

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Message-ID: <CAGXv+5GR1+fgabiVR6SbxsqAKd03gDoByYO0KMSoX3-i2eLbWw@mail.gmail.com>
Date:   Fri, 8 Jul 2022 17:25:08 +0800
From:   Chen-Yu Tsai <wenst@...omium.org>
To:     Hans Verkuil <hverkuil-cisco@...all.nl>
Cc:     Tiffany Lin <tiffany.lin@...iatek.com>,
        Andrew-CT Chen <andrew-ct.chen@...iatek.com>,
        Yunfei Dong <yunfei.dong@...iatek.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Nicolas Dufresne <nicolas.dufresne@...labora.com>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mediatek@...ts.infradead.org,
        Matthias Brugger <matthias.bgg@...il.com>
Subject: Re: [PATCH 4/6] media: mediatek: vcodec: Revert driver name change in
 encoder capabilities

On Fri, Jul 8, 2022 at 5:19 PM Hans Verkuil <hverkuil-cisco@...all.nl> wrote:
>
>
>
> On 7/1/22 12:52, Chen-Yu Tsai wrote:
> > This partially reverts commit fd9f8050e355d7fd1e126cd207b06c96cde7f783.
> >
> > The driver name field should contain the actual driver name, not some
> > otherwise unused string macro from the driver. To make this clear,
> > copy the name from the driver's name field.
> >
> > Fixes: fd9f8050e355 ("media: mediatek: vcodec: Change encoder v4l2 capability value")
> > Signed-off-by: Chen-Yu Tsai <wenst@...omium.org>
> > ---
> >  drivers/media/platform/mediatek/vcodec/mtk_vcodec_drv.h | 1 +
> >  drivers/media/platform/mediatek/vcodec/mtk_vcodec_enc.c | 6 ++++--
> >  2 files changed, 5 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_drv.h b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_drv.h
> > index 4140b4dd85bf..dc6aada882d9 100644
> > --- a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_drv.h
> > +++ b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_drv.h
> > @@ -22,6 +22,7 @@
> >  #define MTK_VCODEC_DRV_NAME  "mtk_vcodec_drv"
>
> Note that this patch removes the last user of this define, so
> you can drop that define as well.
>
> >  #define MTK_VCODEC_DEC_NAME  "mtk-vcodec-dec"
> >  #define MTK_VCODEC_ENC_NAME  "mtk-vcodec-enc"
> > +#define MTK_PLATFORM_STR     "platform:mt8173"
>
> Why add this?
>
> >
> >  #define MTK_VCODEC_MAX_PLANES        3
> >  #define MTK_V4L2_BENCHMARK   0
> > diff --git a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_enc.c b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_enc.c
> > index ccc753074816..30aac54d97fa 100644
> > --- a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_enc.c
> > +++ b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_enc.c
> > @@ -232,11 +232,13 @@ static int mtk_vcodec_enc_get_chip_name(void *priv)
> >  static int vidioc_venc_querycap(struct file *file, void *priv,
> >                               struct v4l2_capability *cap)
> >  {
> > +     struct mtk_vcodec_ctx *ctx = fh_to_ctx(priv);
> > +     struct device *dev = &ctx->dev->plat_dev->dev;
> >       int platform_name = mtk_vcodec_enc_get_chip_name(priv);
> >
> > -     strscpy(cap->driver, MTK_VCODEC_DRV_NAME, sizeof(cap->driver));
> > -     strscpy(cap->card, MTK_VCODEC_ENC_NAME, sizeof(cap->card));
> > +     strscpy(cap->driver, dev->driver->name, sizeof(cap->driver));
> >       snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:mt%d-enc", platform_name);
> > +     strscpy(cap->card, MTK_PLATFORM_STR, sizeof(cap->card));
>
> The next patch changes cap->card again, and leaves MTK_PLATFORM_STR unused.
>
> >
> >       return 0;
> >  }
>
> I think it makes more sense to combine patches 1-3 and 4-6 into single
> patches, one for the decoder, one for the encoder. It's easier to follow
> since they all touch on the same querycap function.

I wrote this series as a revert plus additional changes. As you said, it
makes sense to squash three patches into one.

I'll respin.

ChenYu