Re: [PATCH v7 4/9] media: chips-media: wave6: Add v4l2 m2m driver support

[Frank Li]

On Fri, Sep 04, 2026 at 03:46:30PM +0900, Nas Chung wrote:
> Add v4l2 m2m stateful driver support for the
> Chips&Media Wave6 video codec IP, including both encoder and decoder.
>
> The following features and formats are supported:
> Encoder (8bit only):
> - Supported codecs: AVC, HEVC
> - Supported input formats:
>   * V4L2_PIX_FMT_YUV420/NV12/NV21
>   * V4L2_PIX_FMT_YUV422P/NV16/NV61
>   * V4L2_PIX_FMT_YUYV
>   * V4L2_PIX_FMT_YUV24/NV24/NV42
>   * V4L2_PIX_FMT_RGB24
>   * V4L2_PIX_FMT_P010
>   * V4L2_PIX_FMT_ARGB32
>   * V4L2_PIX_FMT_RGBA32
>   * V4L2_PIX_FMT_XRGB32
>   * V4L2_PIX_FMT_ARGB2101010
> - Supports multiplanar format
> - Although 10-bit input formats are supported (e.g., P010, ARGB2101010),
>   encoded output is limited to 8-bit streams
> - Supports crop
> - Supports extensive v4l2 encoder control
>
> Decoder (8bit only):
> - Supported codecs: AVC, HEVC (8bit only)
> - Supported output formats: V4L2_PIX_FMT_YUV420/NV12/NV21
> - Supports multiplanar format
> - Supports scale down
> - Supports dynamic resolution change
>
> Note: While other versions of the Wave6 IP may support VP9 decoding and
> AV1 decoding and encoding those formats are not implemented or validated
> in this driver at this time.
>
> Signed-off-by: Nas Chung <nas.chung@xxxxxxxxxxxxxxx>
> Tested-by: Ming Qian <ming.qian@xxxxxxxxxxx>
> Tested-by: Marek Vasut <marek.vasut@xxxxxxxxxxx>
> ---
...
> +
> +u64 wave6_vpu_cycle_to_ns(struct vpu_core_device *core, u64 cycle)
> +{
> +	unsigned long rate;
> +
> +	if (!core->num_clks || !core->clks)
> +		return 0;
> +
> +	rate = clk_get_rate(core->clks[0].clk);
> +	if (!rate)
> +		return 0;
> +
> +	return (cycle * NSEC_PER_SEC) / rate;

div_u64, otherwise 32bit compiler build failure.

Frank
> +}
> +
> +int wave6_vpu_wait_interrupt(struct vpu_instance *inst, unsigned int timeout)
> +{
> +	int ret;
> +
> +	ret = wait_for_completion_timeout(&inst->irq_done,
> +					  msecs_to_jiffies(timeout));
> +	if (!ret)
> +		return -ETIMEDOUT;
> +
> +	reinit_completion(&inst->irq_done);
> +
> +	return 0;
> +}
> +