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

From: Thomas Zimmermann <tzimmermann@suse.de>
To: "Noralf Trønnes" <noralf@tronnes.org>, dri-devel@lists.freedesktop.org
Cc: hudson@trmm.net, markus@raatikainen.cc, sam@ravnborg.org,
	linux-usb@vger.kernel.org, th020394@gmail.com, lkundrak@v3.sk,
	pontus.fuchs@gmail.com, peter@stuge.se
Subject: Re: [PATCH v4 0/3] Generic USB Display driver
Date: Thu, 21 Jan 2021 10:59:28 +0100	[thread overview]
Message-ID: <ebda4ea3-3352-f35f-883e-6db751d6ca8b@suse.de> (raw)
In-Reply-To: <20210120170033.38468-1-noralf@tronnes.org>

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Hi

Am 20.01.21 um 18:00 schrieb Noralf Trønnes:
> 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.

Well, I'd strongly ask to not call it "generic", because it isn't. We 
have other USB drivers and anyone can make a USB display with these 
protocols as well. That doesn't make them generic. A USB-standardized 
protocol would be generic. Maybe call it custom, or home-made.

Best regards
Thomas

> 
> 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
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer

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