Re: [PATCH] media: venus: allow interlaced video streams

[Piotr Oniszczuk <piotr.oniszczuk@gmail.com>]

> Wiadomość napisana przez Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com> w dniu 28 lut 2026, o godz. 10:49:
> 
> Venus driver errors out on the interlaced streams with the 'field isn't
> supported' error message, which e.g. prevents decoding of the MPEG2
> video streams. Don't error out if the buffer is set to contain
> interlaced data.
> 
> Tested with the fluster enabled to handle MPEG2 through Gstreamer:
> 
> ./fluster.py r -d GStreamer-MPEG2_VIDEO-V4L2-Gst1.0 -s -so venus-mpeg2.md -j 1
> 
> GLOBAL SUMMARY
> |TOTALS|GStreamer-MPEG2_VIDEO-V4L2-Gst1.0|
> |-|-|
> |TOTAL|30/52|
> |TOTAL TIME|75.526s|
> |-|-|
> |Profile|GStreamer-MPEG2_VIDEO-V4L2-Gst1.0|
> |MAIN|26/32|
> |PROFILE_4_2_2|0/9|
> |SIMPLE|4/11|
> |-|-|
> 
> Fixes: 059790467bf4 ("media: venus: helpers: handle correctly vbuf field")
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
> ---
> drivers/media/platform/qcom/venus/helpers.c | 5 -----
> 1 file changed, 5 deletions(-)
> 
> diff --git a/drivers/media/platform/qcom/venus/helpers.c b/drivers/media/platform/qcom/venus/helpers.c
> index 747c388fe25f..71e79093a4c7 100644
> --- a/drivers/media/platform/qcom/venus/helpers.c
> +++ b/drivers/media/platform/qcom/venus/helpers.c
> @@ -1466,11 +1466,6 @@ int venus_helper_vb2_buf_prepare(struct vb2_buffer *vb)
> if (V4L2_TYPE_IS_OUTPUT(vb->vb2_queue->type)) {
> if (vbuf->field == V4L2_FIELD_ANY)
> vbuf->field = V4L2_FIELD_NONE;
> - if (vbuf->field != V4L2_FIELD_NONE) {
> - dev_err(inst->core->dev, "%s field isn't supported\n",
> - __func__);
> - return -EINVAL;
> - }
> }
> 
> if (vb->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE &&
> 
> ---
> base-commit: 779cae956c8316aebc1946ef86ca001f99658270
> change-id: 20260228-venus-mpeg2-495f9187a1ec
> 
> Best regards,
> -- 
> With best wishes
> Dmitry
> 
> 


Dmitry,
I applied this on 6.19.4 mainline and give run with interlaced content (hd tv) on qcs6490 (radxa dragon sbc).
Playback fails like this: https://gist.github.com/warpme/a368983678af0a76af85314808773076
pls see a bootom kernel output showing venus failure.
my sw stack plays ok on e.g rpi4 stateful v4l2m2m so i think root cause isn't in my userspace....
pls let me know if anything extra is required to fix venus decoder issue.
br