linux-kernel - Re: [PATCH v3 2/2] media: mtk-vcodec: fix build breakage when one of VPU or SCP is enabled

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Message-ID: <CAPBb6MW8KvoxO8KNXM5azgijMT9aSis8ZZ=mumA0_JyQTbKyVQ@mail.gmail.com>
Date:   Tue, 13 Oct 2020 09:57:25 +0900
From:   Alexandre Courbot <acourbot@...omium.org>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     Tiffany Lin <tiffany.lin@...iatek.com>,
        Andrew-CT Chen <andrew-ct.chen@...iatek.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        Alexandre Courbot <gnurou@...il.com>
Subject: Re: [PATCH v3 2/2] media: mtk-vcodec: fix build breakage when one of
 VPU or SCP is enabled

On Tue, Oct 13, 2020 at 12:00 AM Randy Dunlap <rdunlap@...radead.org> wrote:
>
> On 10/11/20 10:35 PM, Alexandre Courbot wrote:
> > The addition of MT8183 support added a dependency on the SCP remoteproc
> > module. However the initial patch used the "select" Kconfig directive,
> > which may result in the SCP module to not be compiled if remoteproc was
> > disabled. In such a case, mtk-vcodec would try to link against
> > non-existent SCP symbols. "select" was clearly misused here as explained
> > in kconfig-language.txt.
> >
> > Replace this by a "depends" directive on at least one of the VPU and
> > SCP modules, to allow the driver to be compiled as long as one of these
> > is enabled, and adapt the code to support this new scenario.
> >
> > Also adapt the Kconfig text to explain the extra requirements for MT8173
> > and MT8183.
> >
> > Reported-by: Sakari Ailus <sakari.ailus@...ux.intel.com>
> > Signed-off-by: Alexandre Courbot <acourbot@...omium.org>
> > Acked-by: Randy Dunlap <rdunlap@...radead.org> # build-tested
>
> That Ack applied to v2. I have not tested nor acked this version of the patch.

Sorry about that - I was careless and left it in the log.

>
> > Acked-by: Sakari Ailus <sakari.ailus@...ux.intel.com>
> > ---
> >  drivers/media/platform/Kconfig                | 22 +++++++++++++++----
> >  drivers/media/platform/mtk-vcodec/Makefile    | 10 +++++++--
> >  .../platform/mtk-vcodec/mtk_vcodec_fw_priv.h  | 18 +++++++++++++++
> >  3 files changed, 44 insertions(+), 6 deletions(-)
> >
> > diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
> > index a3cb104956d5..457b6c39ddc0 100644
> > --- a/drivers/media/platform/Kconfig
> > +++ b/drivers/media/platform/Kconfig
> > @@ -253,18 +253,32 @@ config VIDEO_MEDIATEK_VCODEC
> >       depends on MTK_IOMMU || COMPILE_TEST
> >       depends on VIDEO_DEV && VIDEO_V4L2
> >       depends on ARCH_MEDIATEK || COMPILE_TEST
> > +     depends on VIDEO_MEDIATEK_VPU || MTK_SCP
> > +     # The two following lines ensure we have the same state ("m" or "y") as
> > +     # our dependencies, to avoid missing symbols during link.
> > +     depends on VIDEO_MEDIATEK_VPU || !VIDEO_MEDIATEK_VPU
> > +     depends on MTK_SCP || !MTK_SCP
> >       select VIDEOBUF2_DMA_CONTIG
> >       select V4L2_MEM2MEM_DEV
> > -     select VIDEO_MEDIATEK_VPU
> > -     select MTK_SCP
> > +     select VIDEO_MEDIATEK_VCODEC_VPU if VIDEO_MEDIATEK_VPU
> > +     select VIDEO_MEDIATEK_VCODEC_SCP if MTK_SCP
> >       help
> >           Mediatek video codec driver provides HW capability to
> > -         encode and decode in a range of video formats
> > -         This driver rely on VPU driver to communicate with VPU.
> > +         encode and decode in a range of video formats on MT8173
> > +         and MT8183.
> > +
> > +         Note that support for MT8173 requires VIDEO_MEDIATEK_VPU to
> > +         also be selected. Support for MT8183 depends on MTK_SCP.
> >
> >           To compile this driver as modules, choose M here: the
> >           modules will be called mtk-vcodec-dec and mtk-vcodec-enc.
> >
> > +config VIDEO_MEDIATEK_VCODEC_VPU
> > +     bool
> > +
> > +config VIDEO_MEDIATEK_VCODEC_SCP
> > +     bool
> > +
> >  config VIDEO_MEM2MEM_DEINTERLACE
> >       tristate "Deinterlace support"
> >       depends on VIDEO_DEV && VIDEO_V4L2
> > diff --git a/drivers/media/platform/mtk-vcodec/Makefile b/drivers/media/platform/mtk-vcodec/Makefile
> > index 6e1ea3a9f052..4618d43dbbc8 100644
> > --- a/drivers/media/platform/mtk-vcodec/Makefile
> > +++ b/drivers/media/platform/mtk-vcodec/Makefile
> > @@ -25,5 +25,11 @@ mtk-vcodec-enc-y := venc/venc_vp8_if.o \
> >  mtk-vcodec-common-y := mtk_vcodec_intr.o \
> >               mtk_vcodec_util.o \
> >               mtk_vcodec_fw.o \
> > -             mtk_vcodec_fw_vpu.o \
> > -             mtk_vcodec_fw_scp.o
> > +
> > +ifneq ($(CONFIG_VIDEO_MEDIATEK_VCODEC_VPU),)
> > +mtk-vcodec-common-y += mtk_vcodec_fw_vpu.o
> > +endif
> > +
> > +ifneq ($(CONFIG_VIDEO_MEDIATEK_VCODEC_SCP),)
> > +mtk-vcodec-common-y += mtk_vcodec_fw_scp.o
> > +endif
> > diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_fw_priv.h b/drivers/media/platform/mtk-vcodec/mtk_vcodec_fw_priv.h
> > index 51f1694a7c7d..b41e66185cec 100644
> > --- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_fw_priv.h
> > +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_fw_priv.h
> > @@ -27,8 +27,26 @@ struct mtk_vcodec_fw_ops {
> >       void (*release)(struct mtk_vcodec_fw *fw);
> >  };
> >
> > +#if IS_ENABLED(CONFIG_VIDEO_MEDIATEK_VCODEC_VPU)
> >  struct mtk_vcodec_fw *mtk_vcodec_fw_vpu_init(struct mtk_vcodec_dev *dev,
> >                                            enum mtk_vcodec_fw_use fw_use);
> > +#else
> > +static inline struct mtk_vcodec_fw *
> > +mtk_vcodec_fw_vpu_init(struct mtk_vcodec_dev *dev,
> > +                    enum mtk_vcodec_fw_use fw_use)
> > +{
> > +     return ERR_PTR(-ENODEV);
> > +}
> > +#endif /* CONFIG_VIDEO_MEDIATEK_VCODEC_VPU */
> > +
> > +#if IS_ENABLED(CONFIG_VIDEO_MEDIATEK_VCODEC_SCP)
> >  struct mtk_vcodec_fw *mtk_vcodec_fw_scp_init(struct mtk_vcodec_dev *dev);
> > +#else
> > +static inline struct mtk_vcodec_fw *
> > +mtk_vcodec_fw_scp_init(struct mtk_vcodec_dev *dev)
> > +{
> > +     return ERR_PTR(-ENODEV);
> > +}
> > +#endif /* CONFIG_VIDEO_MEDIATEK_VCODEC_SCP */
> >
> >  #endif /* _MTK_VCODEC_FW_PRIV_H_ */
> >
>
>
> --
> ~Randy
> Reported-by: Randy Dunlap <rdunlap@...radead.org>