[PATCH] drm/tegra: Stop using iommu_present()

[Dmitry Osipenko]

On 4/5/22 17:19, Robin Murphy wrote:
> Remove the pointless check. host1x_drm_wants_iommu() cannot return true
> unless an IOMMU exists for the host1x platform device, which at the moment
> means the iommu_present() test could never fail.
> 
> Signed-off-by: Robin Murphy <robin.murphy at arm.com>
> ---
>  drivers/gpu/drm/tegra/drm.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c
> index 9464f522e257..bc4321561400 100644
> --- a/drivers/gpu/drm/tegra/drm.c
> +++ b/drivers/gpu/drm/tegra/drm.c
> @@ -1149,7 +1149,7 @@ static int host1x_drm_probe(struct host1x_device *dev)
>  		goto put;
>  	}
>  
> -	if (host1x_drm_wants_iommu(dev) && iommu_present(&platform_bus_type)) {
> +	if (host1x_drm_wants_iommu(dev)) {
>  		tegra->domain = iommu_domain_alloc(&platform_bus_type);
>  		if (!tegra->domain) {
>  			err = -ENOMEM;

host1x_drm_wants_iommu() returns true if there is no IOMMU for the
host1x platform device of Tegra20/30 SoCs.