[RFC PATCH v2 0/4] media: iris: decoder fixes for resolution changes

[Christian Cortner <ccortner@gmail.com>]

Four fixes for iris decoder problems at resolution changes, reworked
after Bryan's review of v1 [1]. There is no Signed-off-by from me,
since I'm not a kernel developer and can't vouch for the code; please
take over whatever is useful. An AI assistant wrote the code and the
logs (Assisted-by in each patch). I'm happy to test.

Tested on glymur (Zenbook A16, laptops tree 65f4ae73 with these four
and the iris patches listed in [2]): v4l2-compliance passes, and
GStreamer and a spec-following client decode bit-exact across
resolution changes. ffmpeg's h264_v4l2m2m still stops at the first
source change when it sets up CAPTURE early (problem 1 in [2]).
Build-tested on media-committers next with W=1, sparse and smatch.

Changes in v2:
- 1/4: shorter log, with the traced firmware flags (Bryan)
- 2/4: shorter log (Bryan)
- 3/4: one helper for the EOS check (Bryan)
- 4/4: comment states the 500 ms limit, no domain check, warn on
  timeout (Bryan)
- v1 5/5 dropped: too much for stable, and broken (Bryan)

[1] https://lore.kernel.org/linux-media/20261027021934.22113-1-ccortner@gmail.com/
[2] https://lore.kernel.org/linux-media/20261026160952.22082-1-ccortner@gmail.com/

Christian Cortner (4):
  media: iris: Don't flag an empty source change LAST buffer as an error
  media: iris: Update the CAPTURE stride and size on S_FMT(OUTPUT)
  media: iris: Signal V4L2_EVENT_EOS only at the end of a drain
  media: iris: Let a resolution change drain before stopping CAPTURE

 .../media/platform/qcom/iris/iris_buffer.c    | 26 +++++---
 .../media/platform/qcom/iris/iris_buffer.h    |  1 +
 .../qcom/iris/iris_hfi_gen2_response.c        |  7 ++-
 .../media/platform/qcom/iris/iris_instance.h  |  3 +
 drivers/media/platform/qcom/iris/iris_state.c |  8 ++-
 drivers/media/platform/qcom/iris/iris_vb2.c   | 26 ++++++--
 drivers/media/platform/qcom/iris/iris_vdec.c  | 61 ++++++++++---------
 drivers/media/platform/qcom/iris/iris_vidc.c  |  1 +
 8 files changed, 91 insertions(+), 42 deletions(-)


base-commit: d7e7bca7169873b46e857c025c10f3336c1258d8
-- 
2.56.0