Re: [PATCH] media: rockchip: Disable VIDEO_ROCKCHIP_VDEC when compile testing for Hexagon

Nicolas Dufresne <[email protected]> Mon, 16 Feb 2026 11:17:30 -0500

Newsgroups	org.kernel.vger.linux-hexagon,dev.linux.lists.llvm,org.infradead.lists.linux-arm-kernel,org.infradead.lists.linux-rockchip,org.kernel.vger.linux-kernel,org.kernel.vger.linux-media
Message-ID	<[email protected]>

Hi Nathan,

Le vendredi 13 février 2026 à 15:10 -0500, Nathan Chancellor a écrit :
> Building rkvdec-vdpu383-h264.c can take a few hours to finish building
> with Clang 20.1.0 or newer when compile testing for Hexagon. While this
> is further investigated and understood on the LLVM side [1], disable
> CONFIG_VIDEO_ROCKCHIP_VDEC when compile testing for Hexagon.
> 
> Link: https://github.com/llvm/llvm-project/issues/178535 [1]
> Signed-off-by: Nathan Chancellor <[email protected]>
> ---
>  drivers/media/platform/rockchip/rkvdec/Kconfig | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/platform/rockchip/rkvdec/Kconfig b/drivers/media/platform/rockchip/rkvdec/Kconfig
> index 5f3bdd848a2c..d03689464206 100644
> --- a/drivers/media/platform/rockchip/rkvdec/Kconfig
> +++ b/drivers/media/platform/rockchip/rkvdec/Kconfig
> @@ -1,7 +1,8 @@
>  # SPDX-License-Identifier: GPL-2.0
>  config VIDEO_ROCKCHIP_VDEC
>  	tristate "Rockchip Video Decoder driver"
> -	depends on ARCH_ROCKCHIP || COMPILE_TEST
> +	# !HEXAGON: https://github.com/llvm/llvm-project/issues/178535
> +	depends on ARCH_ROCKCHIP || (COMPILE_TEST && !HEXAGON)

This is clearly not a pleasing change to make. As this specific data structure
and usage of bitfield has been discussed (along with the numerous issues in
clang/llvm around these). We also agreed to move away from bitfield for this
data structure and use a bitwriter. I would favour delaying this change to give
devs the time to port instead. Ping again if nothing moves within few weeks.

best regards,
Nicolas

>  	depends on VIDEO_DEV
>  	select MEDIA_CONTROLLER
>  	select VIDEOBUF2_DMA_CONTIG
> 
> ---
> base-commit: c824345288d11e269ce41b36c105715bc2286050
> change-id: 20260213-media-disable-rockchip-vdec-hexagon-eb67c47292c5
> 
> Best regards,
> --  
> Nathan Chancellor <[email protected]>
>

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