Re: [PATCH v4 0/3] Generic USB Display driver

From: Lubomir Rintel <lkundrak@v3.sk>
To: "Noralf Trønnes" <noralf@tronnes.org>
Cc: hudson@trmm.net, markus@raatikainen.cc, sam@ravnborg.org,
	linux-usb@vger.kernel.org, dri-devel@lists.freedesktop.org,
	th020394@gmail.com, pontus.fuchs@gmail.com, peter@stuge.se
Subject: Re: [PATCH v4 0/3] Generic USB Display driver
Date: Sun, 24 Jan 2021 19:38:38 +0100	[thread overview]
Message-ID: <20210124183838.GA1873250@demiurge.local> (raw)
In-Reply-To: <20210120170033.38468-1-noralf@tronnes.org>

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@v3.sk>

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].

[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
> 
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