linux-kernel - Re: [PATCH] drm/doc: Add section in the introduction page about learning material

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Date:   Thu, 27 Jan 2022 12:31:44 +0100
From:   Daniel Vetter <daniel@...ll.ch>
To:     Javier Martinez Canillas <javierm@...hat.com>
Cc:     Thomas Zimmermann <tzimmermann@...e.de>,
        linux-kernel@...r.kernel.org, Jonathan Corbet <corbet@....net>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        dri-devel@...ts.freedesktop.org, linux-doc@...r.kernel.org,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Pekka Paalanen <pekka.paalanen@...labora.co.uk>
Subject: Re: [PATCH] drm/doc: Add section in the introduction page about
 learning material

On Thu, Jan 27, 2022 at 11:50:30AM +0100, Javier Martinez Canillas wrote:
> Hello Thomas,
> 
> On 1/27/22 10:18, Thomas Zimmermann wrote:
> > Hi Javier,
> > 
> > thanks for this patch.
> > 
> > Acked-by: Thomas Zimmermann <tzimmermann@...e.de>
> >
> 
> Thanks!
>  
> > Find some ideas for consideration below.
> > 
> 
> [snip]
> 
> >> +
> >> +Learning material
> >> +=================
> > 
> > Maybe 'External References'.
> >
> 
> Agreed, I'll change it.
> 
> >> +
> >> +Since the Linux DRM layer supports complex graphics devices, it can be quite
> >> +overwhelming for newcomers to get familiar with all the needed concepts and
> >> +learn the subsystem's internals.
> > 
> > It sounds a bit intimdating to me. Can we give it a positive spin?
> >
> 
> Pekka also had reservations about this paragraph, so I think that will just
> drop it. The goal of having this section was to ease the learning curve but
> the way I worded it may reinforce the perception that DRM is hard to learn.
> 
> > IMHO we could add a separate section that talks about complexity and 
> > provides guidelines about how to deal with it:  trivial HW? use simple 
> > pipe;  dedicated VRAM? try TTM;  awkward color formats?  see 
> > drm_format_helper.c
> >
> 
> Indeed. And we can add such section as a follow-up. Maybe referring to some
> of the drivers in drivers/gpu/drm/tiny.

Do we have a talk anywhere for tiny?

Otherwise I think it'd be good to just add a paragraph about "hey tiny
exists" and maybe link to fbdev helpers and simple pipe helpers to get
people started with the right entry points for simple drivers.

And make it clear that the above pile of links is more for general
overview and if you don't yet know what exactly it is you need.

Also I guess for this year's xdc I really need to volunteer someone to do
a drm/tiny intro :-)

Cheers, Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch