Hi,
A while back I had the idea to turn a Raspberry Pi Zero into a $5 USB to HDMI/SDTV/DSI/DPI display adapter.
The reason for calling it 'Generic' is so anyone can make a USB display/adapter against this driver, all that's needed is to add a USB vid:pid.
Unfortunately I've had some compounding health problems that have severally limited the time I can spend in front of a computer. For this reason I've decided to keep the gadget driver out-of-tree and focus on getting the host driver merged first.
See the wiki[1] for more information and images for the Raspberry Pi Zero/4.
One big change this time is that I've followed Peter Stuge's advice to not let DRM stuff leak into the USB protocol. This has made the protocol easier to understand just from reading the header file.
Noralf.
[1] https://github.com/notro/gud/wiki
Noralf Trønnes (3): drm/uapi: Add USB connector type drm/probe-helper: Check epoch counter in output_poll_execute() drm: Add Generic USB Display driver
MAINTAINERS | 8 + drivers/gpu/drm/Kconfig | 2 + drivers/gpu/drm/Makefile | 1 + drivers/gpu/drm/drm_probe_helper.c | 7 +- drivers/gpu/drm/gud/Kconfig | 14 + drivers/gpu/drm/gud/Makefile | 4 + drivers/gpu/drm/gud/gud_connector.c | 722 ++++++++++++++++++++++++++++ drivers/gpu/drm/gud/gud_drv.c | 620 ++++++++++++++++++++++++ drivers/gpu/drm/gud/gud_internal.h | 148 ++++++ drivers/gpu/drm/gud/gud_pipe.c | 472 ++++++++++++++++++ include/drm/gud.h | 356 ++++++++++++++ include/uapi/drm/drm_mode.h | 1 + 12 files changed, 2354 insertions(+), 1 deletion(-) create mode 100644 drivers/gpu/drm/gud/Kconfig create mode 100644 drivers/gpu/drm/gud/Makefile create mode 100644 drivers/gpu/drm/gud/gud_connector.c create mode 100644 drivers/gpu/drm/gud/gud_drv.c create mode 100644 drivers/gpu/drm/gud/gud_internal.h create mode 100644 drivers/gpu/drm/gud/gud_pipe.c create mode 100644 include/drm/gud.h