[RFC] Deprecation and removal of the drm2 driver

[Niclas Zeising]

On 05/20/18 18:40, Steve Kargl wrote:
> On Fri, May 18, 2018 at 02:03:32PM -0600, Warner Losh wrote:
>> On Fri, May 18, 2018 at 1:30 PM, Steve Kargl <
>> sgk at troutmask.apl.washington.edu> wrote:
>>
>>> On Fri, May 18, 2018 at 09:14:24PM +0200, Andreas Nilsson wrote:
>>>> On Fri, May 18, 2018, 20:00 Niclas Zeising <zeising at freebsd.org> wrote:
>>>>
>>>>> I propose that we remove the old drm2 driver (sys/dev/drm2) from
>>>>> FreeBSD.  I suggest the driver is marked as deprecated in 11.x and
>>>>> removed from 12.0, as was done for other drivers recently.  Some
>>>>> background and rationale:
>>>>>
>>>>
>>>> Sounds good ( deprecate resp remove ). It causes more confusion and
>>>> problems and it solves nothing.
>>>>
>>>
>>> Check the Makefiles
>>>
>>> % more /usr/ports/graphics/drm-next-kmod/Makefile
>>>
>>> ONLY_FOR_ARCHS= amd64
>>> ONLY_FOR_ARCHS_REASON=  the new KMS components are only supported on amd64
>>>
>>> Not to ia32 friendly.
>>>
>>
>> So do people use i386 for desktop? And need the latest KMS stuff?
>>
> 
> Just a data point.  I had to replace the dead disk in my laptop,
> and after 2 days of doing a re-install and update of -current
> on a shiny new SSD.
> 
> Before loading Xorg.
> 
> % kldstat
> Id Refs Address    Size     Name
>   1    7 0x800000 1ac31d4  kernel
>   2    1 0x1e9ae000 5000     ums.ko
>   3    1 0x1e9b9000 4000     uhid.ko
> 
> After starting Xorg without an xorg.conf in /etc/X11.
> 
> Id Refs Address    Size     Name
>   1   27 0x800000 1ac31d4  kernel
>   2    1 0x1e9ae000 5000     ums.ko
>   3    1 0x1e9b9000 4000     uhid.ko
>   4    1 0x1eaa9000 96000    i915kms.ko
>   5    1 0x1eb40000 4a000    drm2.ko
>   6    4 0x1eb8b000 5000     iicbus.ko
>   7    1 0x1ebc9000 3000     iic.ko
>   8    1 0x1ebcf000 4000     iicbb.ko
> 
> So, drm2.ko and i915kms.ko are loaded automatically.  It is
> unclear why functionality that works should be removed.
> 
> xwininfo shows
> 
>    Width: 1400
>    Height: 1050
>    Depth: 24
>    Visual: 0x21
> 

One of the reasons for the deprecation and removal of the drm2 bits is 
that they prevent us from automatically loading the drm-next/stable-kmod 
kernel modules, since the two collide.
Regards
-- 
Niclas