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

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Date:   Tue, 2 Jul 2019 21:08:43 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Jeffrey Hugo <jeffrey.l.hugo@...il.com>
Cc:     robdclark@...il.com, sean@...rly.run, airlied@...ux.ie,
        daniel@...ll.ch, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/msm/mdp5: Use drm_device for creating gem address
 space

On Mon 01 Jul 10:39 PDT 2019, Jeffrey Hugo 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>

Sorry, but on db820c this patch results in:

[   64.803263] msm_mdp 901000.mdp: [drm:mdp5_kms_init [msm]] *ERROR* failed to attach iommu: -19

Followed by 3 oopses as we're trying to fail the initialization.

Regards,
Bjorn

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