Hi,
A while back I had the idea to turn a Raspberry Pi Zero into a $5 USB to HDMI/SDTV/DPI display adapter.
The protocol is open so people are free to make displays implementing it and use this driver, all that's needed is to add a USB vid:pid to the driver for the display.
See the wiki[1] for more information and images for the Raspberry Pi Zero/4.
Changes in this version: - Use obj-y in Makefile (Peter) - Fix missing le32_to_cpu() when using GUD_DISPLAY_MAGIC (Peter) - Set initial brightness on backlight device
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 GUD USB Display driver
MAINTAINERS | 8 + drivers/gpu/drm/Kconfig | 2 + drivers/gpu/drm/Makefile | 1 + drivers/gpu/drm/drm_connector.c | 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 | 738 ++++++++++++++++++++++++++++ drivers/gpu/drm/gud/gud_drv.c | 625 +++++++++++++++++++++++ drivers/gpu/drm/gud/gud_internal.h | 149 ++++++ drivers/gpu/drm/gud/gud_pipe.c | 475 ++++++++++++++++++ include/drm/gud.h | 356 ++++++++++++++ include/uapi/drm/drm_mode.h | 1 + 13 files changed, 2380 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