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main/linux-postmarketos-qcom-msm8974: upgrade to 5.15.7

Administrator requested to merge msm8974-515 into master

Simple upgrade with few generic kernel features enabled:

  • IWD support
  • F2FS
  • NTFS3_FS
  • USB mass storage support

Disabled and other things:

  • MTD
  • also build more things as modules, to reduce kernel size to compensate some new built-in options, because kernel doesn't boot otherwise.

No new things for pmOS's devices (yet). Should work same as before.

I've fixed few build errors in our additions to upstream like this

drivers/gpu/drm/panel/panel-s6d6fa1.c: In function 's6d6fa1_probe':
drivers/gpu/drm/panel/panel-s6d6fa1.c:366:53: error: 'MIPI_DSI_MODE_EOT_PACKET' undeclared (first use in this function); did you mean 'MIPI_DSI_MODE_NO_EOT_PACKET'?
  366 |                           MIPI_DSI_MODE_VIDEO_HSE | MIPI_DSI_MODE_EOT_PACKET |
      |                                                     ^~~~~~~~~~~~~~~~~~~~~~~~
      |                                                     MIPI_DSI_MODE_NO_EOT_PACKET
drivers/gpu/drm/panel/panel-s6d6fa1.c:366:53: note: each undeclared identifier is reported only once for each function it appears in
make[4]: *** [scripts/Makefile.build:277: drivers/gpu/drm/panel/panel-s6d6fa1.o] Error 1
make[3]: *** [scripts/Makefile.build:540: drivers/gpu/drm/panel] Error 2
make[3]: *** Waiting for unfinished jobs....

but nothing exciting.

I've tested this on 2 devices - on samsung-klte with fresh image (full reflash) and on lg-hammerhead upgraded previous installation which I used few month ago once for the previous kernel (5.14) upgrade. Both devices work same as before as far as I can see, so I don't expect problems on other devices too.

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