[PATCH 0/1][SRU][OEM-5.10] intel/ipu6: remove test pattern generator

[You-Sheng Yang]

From: You-Sheng Yang <vicamo at gmail.com>

BugLink: https://bugs.launchpad.net/bugs/1929157

[Impact]

Intel IPU6 camera driver includes a test pattern generator for early
stage development before hardware ready. This driver exposes additional
device nodes up to 24 of them as video devices. While Microsoft Teams,
and maybe other video/camera apps as well, tries to locate a suitable
device one by one, this may take up to minutes before returning to a
usable state.

[Fix]

Intel resolved this by removing TPG in their kernel driver release
Release_20210520
(https://github.com/intel/ipu6-drivers/commit/362375c928d184fb0b4187df7da1ffd506bbd07f).

[Test Case]

Before this patch, there are 25 video devices on the testing platform.
One additional is created by v4l2loopback. By removing TPG as this
change does, the remaining video devices should be two exactly:

  $ ls -al /dev/video*
  crw-rw----+ 1 root video 81, 0 May 25 02:08 /dev/video0
  crw-rw----  1 root video 81, 1 May 25 02:08 /dev/video1

[Where problems could occur]

On this platform TPG is never used after hardware being enabled. So it's
probably pretty safe to remove them.

[Other Info]

While Intel IPU6 driver is currently for oem-5.10 only and there is plan
for newer kernels at the moment, only oem-5.10 is nominated.

Wang Yating (1):
  UBUNTU: SAUCE: intel/ipu6: Remove unnecessary video devices

 drivers/media/pci/intel/ipu-isys-csi2-be.c | 325 ---------------------
 drivers/media/pci/intel/ipu-isys-csi2-be.h |   3 -
 drivers/media/pci/intel/ipu-isys-csi2.c    |  31 --
 drivers/media/pci/intel/ipu-isys-tpg.c     | 311 --------------------
 drivers/media/pci/intel/ipu-isys-tpg.h     |  99 -------
 drivers/media/pci/intel/ipu-isys-video.c   |  10 -
 drivers/media/pci/intel/ipu-isys-video.h   |   1 -
 drivers/media/pci/intel/ipu-isys.c         |  77 -----
 drivers/media/pci/intel/ipu-isys.h         |   5 +-
 drivers/media/pci/intel/ipu-pdata.h        |   7 -
 drivers/media/pci/intel/ipu6/Makefile      |   3 -
 drivers/media/pci/intel/ipu6/ipu6-isys.c   | 144 ---------
 drivers/media/pci/intel/ipu6/ipu6.c        |  26 +-
 13 files changed, 2 insertions(+), 1040 deletions(-)
 delete mode 100644 drivers/media/pci/intel/ipu-isys-csi2-be.c
 delete mode 100644 drivers/media/pci/intel/ipu-isys-tpg.c
 delete mode 100644 drivers/media/pci/intel/ipu-isys-tpg.h

-- 
2.30.2