linux-kernel - Re: [PATCH] media: mtk-vcodec: fix builds when remoteproc is disabled

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Date:   Sat, 3 Oct 2020 09:50:14 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Alexandre Courbot <acourbot@...omium.org>,
        Tiffany Lin <tiffany.lin@...iatek.com>,
        Andrew-CT Chen <andrew-ct.chen@...iatek.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Tomasz Figa <tfiga@...omium.org>
Cc:     Hans Verkuil <hverkuil-cisco@...all.nl>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH] media: mtk-vcodec: fix builds when remoteproc is disabled

On 10/3/20 6:09 AM, 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>

I was seeing this also, so I checked this patch. WFM.

Acked-by: Randy Dunlap <rdunlap@...radead.org> # build-tested

See below.

> ---
>  drivers/media/platform/Kconfig                | 11 +--
>  .../media/platform/mtk-vcodec/mtk_vcodec_fw.c | 72 ++++++++++++-------
>  2 files changed, 55 insertions(+), 28 deletions(-)
> 
> diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
> index a3cb104956d5..e559d9c529b6 100644
> --- a/drivers/media/platform/Kconfig
> +++ b/drivers/media/platform/Kconfig
> @@ -253,14 +253,17 @@ 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
>  	select VIDEOBUF2_DMA_CONTIG
>  	select V4L2_MEM2MEM_DEV
> -	select VIDEO_MEDIATEK_VPU
> -	select 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 support for MT8173 requires

Drop one of "support for" above. (or "for support" ;)

> +	    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.


thanks.
-- 
~Randy