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

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Date:   Mon, 1 Jul 2019 12:45:38 -0700
From:   Rob Clark <robdclark@...il.com>
To:     Jeffrey Hugo <jeffrey.l.hugo@...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 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

BR,
-R

>                 if (IS_ERR(aspace)) {
>                         ret = PTR_ERR(aspace);
> --
> 2.17.1
>