linux-kernel - Re: [PATCH] drm: msm: Fix add_gpu

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Date:   Wed, 26 Jun 2019 15:15:10 -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: Fix add_gpu_components

On Wed, Jun 26, 2019 at 11:00 AM Jeffrey Hugo <jeffrey.l.hugo@...il.com> wrote:
>
> add_gpu_components() adds found GPU nodes from the DT to the match list,
> regardless of the status of the nodes.  This is a problem, because if the
> nodes are disabled, they should not be on the match list because they will
> not be matched.  This prevents display from initing if a GPU node is
> defined, but it's status is disabled.
>
> Fix this by checking the node's status before adding it to the match list.

hmm, I guess a case I had certainly never tested ;-)

I wonder if it really makes sense for gpu to ever be disabled (since
it isn't depending on external non-SoC-specific wiring up of things..
but I guess that might still be useful for bring-up.. either way,

Reviewed-by: Rob Clark <robdclark@...il.com>

Sean, want to pick this up in drm-misc-fixes?

BR,
-R

>
> Fixes: dc3ea265b856 ("drm/msm: Drop the gpu binding")
> Signed-off-by: Jeffrey Hugo <jeffrey.l.hugo@...il.com>
> ---
>  drivers/gpu/drm/msm/msm_drv.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
> index ab64ab470de7..4aeb84f1d874 100644
> --- a/drivers/gpu/drm/msm/msm_drv.c
> +++ b/drivers/gpu/drm/msm/msm_drv.c
> @@ -1279,7 +1279,8 @@ static int add_gpu_components(struct device *dev,
>         if (!np)
>                 return 0;
>
> -       drm_of_component_match_add(dev, matchptr, compare_of, np);
> +       if (of_device_is_available(np))
> +               drm_of_component_match_add(dev, matchptr, compare_of, np);
>
>         of_node_put(np);
>
> --
> 2.17.1
>