Re: [RFC] Deprecation and removal of the drm2 driver

On 18-05-18 13:22:01, Ben Widawsky wrote:
> On 18-05-18 14:15:03, Warner Losh wrote:
> > On Fri, May 18, 2018 at 2:12 PM, Johannes Lundberg <[email protected]>
> > wrote:
> > 
> > >
> > >
> > > On Fri, May 18, 2018 at 9:03 PM, Warner Losh <[email protected]> wrote:
> > >
> > >> On Fri, May 18, 2018 at 1:30 PM, Steve Kargl <
> > >> [email protected]> wrote:
> > >>
> > >> > On Fri, May 18, 2018 at 09:14:24PM +0200, Andreas Nilsson wrote:
> > >> > > On Fri, May 18, 2018, 20:00 Niclas Zeising <[email protected]>
> > >> 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:
> > >> > > >
> > >> > > > The drm2 driver was the original port of a KMS driver to FreeBSD.
> > >> It
> > >> > > > was done by Konstantin Belousov to support Intel graphics cards, and
> > >> > > > later extended by Jean-Sébastien Pédron as well as Konstantin to
> > >> match
> > >> > > > what's in Linux 3.8.  This included unstable support from Haswell,
> > >> but
> > >> > > > nothing newer than that.
> > >> > > >
> > >> > > > For quite some time now we have had the graphics/drm-stable-kmod and
> > >> > > > graphics/drm-next-kmods which provides support for modern AMD and
> > >> Intel
> > >> > > > graphics cards.  These ports, together with the linuxkpi, or lkpi,
> > >> has
> > >> > > > made it significantly easier to port and update our graphics
> > >> drivers.
> > >> > > > Further, these new drivers cover the same drivers as the old drm2
> > >> > driver.
> > >> > > >
> > >> > > > What does the community think?  Is there anyone still using the drm2
> > >> > > > driver on 12-CURRENT?  If so, what is preventing you from switching
> > >> to
> > >> > > > the port?
> > >> > > >
> > >> > > > Thank you
> > >> > > > Regards
> > >> > > > --
> > >> > > > Niclas Zeising
> > >> > > > FreeBSD x11/graphics team
> > >> > > > _______________________________________________
> > >> > > > [email protected] mailing list
> > >> > > > https://lists.freebsd.org/mailman/listinfo/freebsd-current
> > >> > > > To unsubscribe, send any mail to "freebsd-current-unsubscribe@
> > >> > freebsd.org"
> > >> > > >
> > >> > >
> > >> > > 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?
> > >>
> > >
> > > Yeah I was wondering the same.. If you're running i386, do you need drm
> > > drivers? Will scfb work an i386? (probably has legacy bios and if I
> > > remember correctly, scfb is UEFI only)
> > > I do feel sorry for anyone who would have to revert back to VESA...
> > >
> > > Would it be too much trouble to move it to a port?
> > >
> > 
> > If there's someone who needs it for i386, and wants to do the work and
> > maintain it, we should allow it. But the drm2 maintainers have said its
> > likely totally broken anyway.
> > 
> > Warner
> 
> As a long time developer in drm/i915, and newly interested in FreeBSD (ie. no
> history on the matter), is there some upside and/or desire to have native
> support, or is the drm-next-kmod solution good enough?

Aside from lack of 32b support...

-- 
Ben Widawsky, Intel Open Source Technology Center
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