[PATCH] drm/arm/malidp: Stop using iommu_present()

[Brian Starkey]

Hi Robin,

On Tue, Apr 05, 2022 at 03:11:18PM +0100, Robin Murphy wrote:
> iommu_get_domain_for_dev() is already perfectly happy to return NULL
> if the given device has no IOMMU. Drop the unnecessary check.
> 
> Signed-off-by: Robin Murphy <robin.murphy at arm.com>

LGTM, Acked-by: Brian Starkey <brian.starkey at arm.com>

I'll have to leave it to Liviu to push though.

Thanks,
-Brian

> ---
>  drivers/gpu/drm/arm/malidp_planes.c | 14 +++++---------
>  1 file changed, 5 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/gpu/drm/arm/malidp_planes.c b/drivers/gpu/drm/arm/malidp_planes.c
> index 0562bdaac00c..81d9f5004025 100644
> --- a/drivers/gpu/drm/arm/malidp_planes.c
> +++ b/drivers/gpu/drm/arm/malidp_planes.c
> @@ -310,17 +310,13 @@ static int malidp_se_check_scaling(struct malidp_plane *mp,
>  
>  static u32 malidp_get_pgsize_bitmap(struct malidp_plane *mp)
>  {
> -	u32 pgsize_bitmap = 0;
> +	struct iommu_domain *mmu_dom;
>  
> -	if (iommu_present(&platform_bus_type)) {
> -		struct iommu_domain *mmu_dom =
> -			iommu_get_domain_for_dev(mp->base.dev->dev);
> +	mmu_dom = iommu_get_domain_for_dev(mp->base.dev->dev);
> +	if (mmu_dom)
> +		return mmu_dom->pgsize_bitmap;
>  
> -		if (mmu_dom)
> -			pgsize_bitmap = mmu_dom->pgsize_bitmap;
> -	}
> -
> -	return pgsize_bitmap;
> +	return 0;
>  }
>  
>  /*
> -- 
> 2.28.0.dirty
>