[Freedreno] [PATCH v2 5/5] drm/msm: switch msm_kms_init_aspace() to use device_iommu_mapped()

[Dmitry Baryshkov]

Change msm_kms_init_aspace() to use generic function
device_iommu_mapped() instead of the fwnode-specific interface
dev_iommu_fwspec_get(). While we are at it, stop referencing
platform_bus_type directly and use the bus of the IOMMU device.

Suggested-by: Robin Murphy <robin.murphy at arm.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov at linaro.org>
---
 drivers/gpu/drm/msm/msm_drv.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index 98ae0036ab57..2fc3f820cd59 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -272,21 +272,21 @@ struct msm_gem_address_space *msm_kms_init_aspace(struct drm_device *dev)
 	struct device *mdss_dev = mdp_dev->parent;
 	struct device *iommu_dev;
 
-	domain = iommu_domain_alloc(&platform_bus_type);
-	if (!domain) {
-		drm_info(dev, "no IOMMU, fallback to phys contig buffers for scanout\n");
-		return NULL;
-	}
-
 	/*
 	 * IOMMUs can be a part of MDSS device tree binding, or the
 	 * MDP/DPU device.
 	 */
-	if (dev_iommu_fwspec_get(mdp_dev))
+	if (device_iommu_mapped(mdp_dev))
 		iommu_dev = mdp_dev;
 	else
 		iommu_dev = mdss_dev;
 
+	domain = iommu_domain_alloc(iommu_dev->bus);
+	if (!domain) {
+		drm_info(dev, "no IOMMU, fallback to phys contig buffers for scanout\n");
+		return NULL;
+	}
+
 	mmu = msm_iommu_new(iommu_dev, domain);
 	if (IS_ERR(mmu)) {
 		iommu_domain_free(domain);
-- 
2.35.1