Em Mon, 12 Oct 2020 14:35:57 +0900
Alexandre Courbot <acour...@chromium.org> escreveu:
> 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.ai...@linux.intel.com>
> Signed-off-by: Alexandre Courbot <acour...@chromium.org>
> Acked-by: Randy Dunlap <rdun...@infradead.org> # build-tested
> Acked-by: Sakari Ailus <sakari.ai...@linux.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.
Just my 2 cents here, and to complement my last e-mail, the helper message
here IMO is a lot more confusing than if you do this, instead:
config VIDEO_MEDIATEK_CODEC
depends on VIDEO_MEDIATEK_VPU_SCP || VIDEO_MEDIATEK_VPU
default y
config VIDEO_MEDIATEK_VPU
depends on VIDEO_DEV && VIDEO_V4L2
depends on ARCH_MEDIATEK || COMPILE_TEST
tristate "Enable Mediatek Video Processor Unit for MT8173"
help
Select this option to enable Mediatek VPU on MT8173.
config VIDEO_MEDIATEK_VPU_SCP
depends on VIDEO_DEV && VIDEO_V4L2
depends on ARCH_MEDIATEK || COMPILE_TEST
tristate "Enable Mediatek Video Processor Unit for MT8183"
help
Select this option to enable Mediatek VPU on MT8183.
To be clear, from my side, I can live with either one of the alternatives,
but, IMHO, the above is a lot clearer for anyone wanting to use
VPU, as, if MTK_SCP is disabled, the MT8183 Kconfig prompt will
disappear.
Thanks,
Mauro
