Re: [PATCH 4/4] media: staging/ipu7: Add monochrome pixel formats

[Qiling Zhu <kmatzkaczor244@gmail.com>]

Hi Ruslan,

On Tue, Sep 29, 2026 at 12:22:38PM +0300, Ruslan Koreev wrote:

> I wasn't aware the ipu6 driver had grown IPU7 support, my base was
> 7.3-rc5. Tested now on next-20260924 with the ipu6 driver and patches
> 1-3, the vd55g1 one reworked as you suggested: the sensor probes,
> ipu-bridge connects both cameras, libcamera streams Y8 804x704 at 58 fps
> from the VD55G1, and Y10 and Y10P stream with plain V4L2. So this patch
> is not needed there; I'll drop it in v2.
> 
> Ruslan

I tested patches 1-3 from v1 on another ThinkPad X1 Carbon Gen 14
(21V8A028CD, Panther Lake, IPU7 PCI 8086:b05d) using the ipu6 driver on
next-20260928. I did not apply patch 4.

Patches 1-3 applied cleanly without local changes. The VD55G1
probes successfully, TBE20A1 is discovered by ipu-bridge, and the
media topology is established as:

  vd55g1 1-0010
    -> Intel IPU6 CSI2 2
    -> Intel IPU6 ISYS Capture 16
    -> /dev/video16

The sensor reports Y10_1X10/804x704, and /dev/video16 enumerates
GREY, Y10 and Y10P. Setting Y10 at 804x704 succeeds with:

  Bytes per Line : 1664
  Size Image     : 1173120

However, VIDIOC_STREAMON returns EPIPE for Y10, Y10P and GREY,
and no frames are captured.

Since you reported successful plain-V4L2 Y10/Y10P streaming on
next-20260924, could you share the exact media-ctl/v4l2-ctl commands
and any setup performed before STREAMON? I'd like to reproduce the
same sequence before looking for differences between the two
linux-next snapshots.

My test base before applying the series was:

  6375e61c01e93e35ee7acd336a689ac1fae4b509 (next-20260928)

Hardware: ThinkPad X1 Carbon Gen 14, 21V8A028CD
Kernel: 7.3.0-rc5-next-20260928-x1c14ir

Thanks,
Qiling Zhu