[PATCH 00/10] Set up generic fbdev after registering device

[Thomas Zimmermann]

Hi Sam

Am 07.04.20 um 18:50 schrieb Sam Ravnborg:
> Hi Thomas/Noralf.
> 
>>> Having DRM core take care of fbdev emulation was an idea Laurent had
>>> which was the spark that set me off making the generic fbdev emulation.
>>>
>>> Maybe it's still too early to make this move, I don't know.
>>
>> I think we should wait a bit. As you mentioned, there are drivers that
>> have an fbdev bpp that differs from the preferred one. There might also
>> be a chicken-and-egg problem with core and fb-helper modules.
> 
> Noralf - you had analyzed what drivers are (yet) to migrate to
> to the common fbdev emulation.
> Link: https://lore.kernel.org/dri-devel/34e654ae-0cc9-e393-ac02-e4ac6eda60f6@tronnes.org/
> 
> armada

This one looks like its convertible to common infrastructure. Not just
the fbdev console, but quite a bit of the framebuffer and GEM code. But
I don't have the HW to test any patches.

> gma500

I have a patch for replacing some of the gma500 code with common
infrastructure. It currently fails and I haven't found time to look closer.

> amd
> omapdrm
> nouveau
> i915
> msm
> tegra
> exynos
> radeon
> rockchip
> 
> Maybe add this list to todo.rst - and if someone knows about it
> we could have a small description what is required before a
> driver can migrate.
> I can cook up the patch if anyone thinks this is useful.

I thought there already was such an entry in the TODO list. Some of
these drivers have HW acceleration of some kind; although the benefits
might be debatable. And there where 2 or 3 drivers with a design that is
incompatible with generic fbdev. There's also some information at [1].

In any case, we should consider initializing each driver's fb console
after registering the device. All console implementations would than act
like DRM clients and less like driver components.

Best regards
Thomas

[1]
https://lore.kernel.org/dri-devel/7016126a-f498-1a4a-4721-c6305a961457@suse.de/

> 
> 	Sam
> 

-- 
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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