[PATCH] drm/msm: log iommu init failure

[Dmitry Baryshkov]

On Mon, 24 Jun 2024 at 20:59, Rob Clark <robdclark at gmail.com> wrote:
>
> On Thu, Jun 20, 2024 at 11:48 PM Luca Weiss <luca.weiss at fairphone.com> wrote:
> >
> > On Fri Jun 21, 2024 at 12:47 AM CEST, Konrad Dybcio wrote:
> > >
> > >
> > > On 6/20/24 20:24, Dmitry Baryshkov wrote:
> > > > On Thu, 20 Jun 2024 at 20:32, Rob Clark <robdclark at gmail.com> wrote:
> > > >>
> > > >> On Thu, May 30, 2024 at 2:48 AM Marc Gonzalez <mgonzalez at freebox.fr> wrote:
> > > >>>
> > > >>> On 16/05/2024 10:43, Marijn Suijten wrote:
> > > >>>
> > > >>>> On 2024-05-15 17:09:02, Marc Gonzalez wrote:
> > > >>>>
> > > >>>>> When create_address_space() fails (e.g. when smmu node is disabled)
> > > >>
> > > >> Note that smmu support is going to become a hard dependency with the
> > > >> drm_gpuvm/VM_BIND conversion.. which I think means we should never get
> > > >> far enough to hit this error path..
> > > >
> > > > Does that mean that we will lose GPU support on  MSM8974?
>
> And display support as well :-/
>
> Note that GPU should be disabled by default without smmu.. you can
> override with modparam, but please don't.  It is incredibly insecure,
> you might as well make /dev/mem world readable/writeable.
>
> Is simplefb an option on 8974 or 8226 to keep display support?

Not in a longer term, I still hope to push HDMI PHY/PLL support for
MSM8974, which means dynamic resolution support.

>
> BR,
> -R
>
> > >
> > > Yeah, that was brought up on #freedreno some time ago
> >
> > Also on MSM8226 which I also care about...
> >
> > Anyone at all knowledgable on IOMMU would be very welcome to help out
> > with IOMMU support on these two platforms (and anything else that
> > old?) in any case, since me and some other people have looked at this
> > (on and off) for years but haven't gotten to any stable or usable point
> > unfortunately.
> >
> > Regards
> > Luca
> >
> > >
> > > Konrad
> >



-- 
With best wishes
Dmitry