linux-kernel - Re: [PATCH] drm/msm/mdp5: Use drm_device for creating gem address space

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Date:   Mon, 1 Jul 2019 14:22:27 -0600
From:   Jeffrey Hugo <jeffrey.l.hugo@...il.com>
To:     Rob Clark <robdclark@...il.com>
Cc:     Sean Paul <sean@...rly.run>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        freedreno <freedreno@...ts.freedesktop.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/msm/mdp5: Use drm_device for creating gem address space

On Mon, Jul 1, 2019 at 1:45 PM Rob Clark <robdclark@...il.com> wrote:
>
> On Mon, Jul 1, 2019 at 10:39 AM Jeffrey Hugo <jeffrey.l.hugo@...il.com> wrote:
> >
> > Creating the msm gem address space requires a reference to the dev where
> > the iommu is located.  The driver currently assumes this is the same as
> > the platform device, which breaks when the iommu is outside of the
> > platform device.  Use the drm_device instead, which happens to always have
> > a reference to the proper device.
> >
> > Signed-off-by: Jeffrey Hugo <jeffrey.l.hugo@...il.com>
> > ---
> >  drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
> > index 4a60f5fca6b0..1347a5223918 100644
> > --- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
> > +++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
> > @@ -702,7 +702,7 @@ struct msm_kms *mdp5_kms_init(struct drm_device *dev)
> >         mdelay(16);
> >
> >         if (config->platform.iommu) {
> > -               aspace = msm_gem_address_space_create(&pdev->dev,
> > +               aspace = msm_gem_address_space_create(dev->dev,
> >                                 config->platform.iommu, "mdp5");
>
> hmm, do you have a tree somewhere with your dt files?  This makes me
> think the display iommu is hooked up somewhere differently compared
> to, say, msm8916.dtsi

I'll post something somewhere and forward it to you.