Den 24.01.2021 19.38, skrev Lubomir Rintel: > On Wed, Jan 20, 2021 at 06:00:30PM +0100, Noralf Trønnes wrote: >> 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 > > The patch set: > > Tested-by: Lubomir Rintel <lkundrak@xxxxx> > > Works like a charm with this board [1], though it didn't impress the girls > as much as I hoped. Code here [2], picture here [3]. > I have wondered what color display resolution it is possible to drive over USB full speed. I can understand that your PoC wasn't that impressive since it doesn't use DMA to drive the SPI bus. The new $4 Raspberry Pi Pico that came out this week looks interesting as a USB interface board for tiny panels. It can drive DPI panels directly, has 2 cores @133MHz, 264K SRAM and USB full speed. Maybe lz4 decompression is even possible. Another good thing is that the board will be around for a long time. Thanks for testing, I have limited bandwith these days so I couldn't do a test on an MCU myself. Noralf. > [1] https://www.banggood.com/LILYGO-TTGO-T-Display-GD32-RISC-V-32-bit-Core-Minimal-Development-Board-1_14-IPS-p-1652870.html?rmmds=search&cur_warehouse=CN > [2] https://github.com/hackerspace/libopencm3-gf32v-examples/commit/7ef51b31b9 > [3] https://people.freedesktop.org/~lkundrak/lilygo.jpeg > > Had to apply a fix for the drm_connector_enum_list[] ommission I mentioned > elsewhere, and that I've now noticed you've noted previously. > > Take care > Lubo > >> >> >> 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 >> >> -- >> 2.23.0 >> > _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
