[PATCH 0/7][Unstable] Fix vsc ace set host command timeout

[You-Sheng Yang]

BugLink: https://bugs.launchpad.net/bugs/2067364

[Impact]

With IVSC switched to in-tree driver since 6.8 kernels in bug 2061747, it's
still suffering from various problems that blocks camera driver stack being
loaded correctly.

The ivsc-ace driver may fail to communicate with the underlying firmware with
error messages:

  ivsc_ace intel_vsc-5db76cf6-0a68-4ed6-9b78-0361635e2447: switch camera to
  host failed: -110

This happens after warm reboots. In addition, ivs may block suspend resume, too.

[Fix]

These symptoms are to be addressed by upstream reviewing patchsets:
* https://lore.kernel.org/all/20240624014223.4171341-1-wentong.wu@intel.com/
* https://lore.kernel.org/all/20240607132547.2820515-1-wentong.wu@intel.com/
* commit 9b5e045029d8 ("mei: vsc: Don't stop/restart mei device during system
  suspend/resume") from v6.10-rc4

[Test Case]

1. test camera after rebooting into a proposed kernel,
2. run suspend/resume stress test plan.
3. verify camera still working

[Where problems could occur]

These fixes are quite limited to ipu6/ivsc platforms, and affected no
power-consumption or other notisible problem.

[Other Info]

While some of the fixes are still under upstream review, meaning they're not
yet available in any kernel release, linux-unstable/oracular/noble and
oem-6.8/6.1x will be nominated for fix.

Wentong Wu (7):
  UBUNTU: SAUCE: media: ivsc: csi: don't count privacy on as error
  UBUNTU: SAUCE: media: ivsc: csi: add separate lock for v4l2 control
    handler
  UBUNTU: SAUCE: media: ivsc: csi: remove privacy status in struct
    mei_csi
  UBUNTU: SAUCE: mei: vsc: Enhance IVSC chipset stability during warm
    reboot
  UBUNTU: SAUCE: mei: vsc: Enhance SPI transfer of IVSC rom
  UBUNTU: SAUCE: mei: vsc: Utilize the appropriate byte order swap
    function
  UBUNTU: SAUCE: mei: vsc: Prevent timeout error with added delay
    post-firmware download

 drivers/media/pci/intel/ivsc/mei_csi.c | 24 +++++++++++++++---------
 drivers/misc/mei/platform-vsc.c        |  4 ++--
 drivers/misc/mei/vsc-tp.c              | 18 ++++++++++++++++--
 3 files changed, 33 insertions(+), 13 deletions(-)

-- 
2.43.0