[0/9] drm/udl: Support adapters without vendor firmware descriptor

Message

Thomas Zimmermann April 1, 2025, 4:12 p.m. UTC

Fallback to default values for devices without vendor firmware
descriptor. Enables support for such devices. Since we're at it,
improve the descriptor parser.

Patches 1 to 3 do some cleanups for the driver.

Patches 4 to 8 rewrite the parser code for the vendor firmware
descriptor. It's now more compatible and validates the raw input
more reliably.

Patch 9 adds support for the additional devices.

Tested with various DisplayLink adapters, including one without
vendor firmware descriptor.

Thomas Zimmermann (9):
  drm/udl: Remove unused field dev from struct udl_device
  drm/udl: Remove unused field gem_lock from struct udl_device
  drm/udl: Improve type safety when using struct udl_device
  drm/udl: The number of pixels is always positive
  drm/udl: Handle errors from usb_get_descriptor()
  drm/udl: Return error if vendor descriptor is too short
  drm/udl: Treat vendor descriptor as u8
  drm/udl: Validate length in vendor-descriptor parser
  drm/udl: Support adapters without firmware descriptor

 drivers/gpu/drm/udl/udl_drv.c      |   6 +-
 drivers/gpu/drm/udl/udl_drv.h      |  19 ++--
 drivers/gpu/drm/udl/udl_main.c     | 174 +++++++++++++++++------------
 drivers/gpu/drm/udl/udl_modeset.c  |  21 ++--
 drivers/gpu/drm/udl/udl_transfer.c |   6 +-
 5 files changed, 128 insertions(+), 98 deletions(-)