From: Robin Murphy robin.murphy@arm.com

[ Upstream commit e2a88eabb02410267519b838fb9b79f5206769be ]

Even if some IOMMU has registered itself on the platform "bus", that doesn't necessarily mean it provides translation for the device we care about. Replace iommu_present() with a more appropriate check.

Signed-off-by: Robin Murphy robin.murphy@arm.com Reviewed-by: Rob Clark robdclark@gmail.com Patchwork: https://patchwork.freedesktop.org/patch/480707/ Link: https://lore.kernel.org/r/5ab4f4574d7f3e042261da702d493ee40d003356.164916826... Signed-off-by: Dmitry Baryshkov dmitry.baryshkov@linaro.org Signed-off-by: Rob Clark robdclark@chromium.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/msm/msm_drv.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c index bbf999c66517..d6d40429016d 100644 --- a/drivers/gpu/drm/msm/msm_drv.c +++ b/drivers/gpu/drm/msm/msm_drv.c @@ -403,7 +403,7 @@ bool msm_use_mmu(struct drm_device *dev) struct msm_drm_private *priv = dev->dev_private;

/* a2xx comes with its own MMU */ - return priv->is_a2xx || iommu_present(&platform_bus_type); + return priv->is_a2xx || device_iommu_mapped(dev->dev); }

static int msm_init_vram(struct drm_device *dev)