From 518304cbf3b2452e1e592e06bed65baced0a530d Mon Sep 17 00:00:00 2001
From: Jeffrey Hugo <jeffrey.l.hugo@gmail.com>
Date: Mon, 8 Jul 2019 08:12:24 -0700
Subject: drm/msm/mdp5: Find correct node for creating gem address space
Git-commit: 518304cbf3b2452e1e592e06bed65baced0a530d
Patch-mainline: v5.4-rc1
References: bsc#1152489

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 (ie in the parent).  Default to using the platform device,
but check to see if that has an iommu reference, and if not, use the parent
device instead.  This should handle all the various iommu designs for
mdp5 supported systems.

Signed-off-by: Jeffrey Hugo <jeffrey.l.hugo@gmail.com>
Tested-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
---
 drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c | 7 ++++++-
 1 file changed, 6 insertions(+), 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 13416dc229c0..0beca82661c5 100644
--- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
+++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
@@ -669,6 +669,7 @@ struct msm_kms *mdp5_kms_init(struct drm_device *dev)
 	struct msm_kms *kms;
 	struct msm_gem_address_space *aspace;
 	int irq, i, ret;
+	struct device *iommu_dev;
 
 	/* priv->kms would have been populated by the MDP5 driver */
 	kms = priv->kms;
@@ -708,7 +709,11 @@ struct msm_kms *mdp5_kms_init(struct drm_device *dev)
 	mdelay(16);
 
 	if (config->platform.iommu) {
-		aspace = msm_gem_address_space_create(&pdev->dev,
+		iommu_dev = &pdev->dev;
+		if (!iommu_dev->iommu_fwspec)
+			iommu_dev = iommu_dev->parent;
+
+		aspace = msm_gem_address_space_create(iommu_dev,
 				config->platform.iommu, "mdp5");
 		if (IS_ERR(aspace)) {
 			ret = PTR_ERR(aspace);
-- 
2.28.0