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From:   Sasha Levin <sashal@kernel.org>
To:     linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc:     Robin Murphy <robin.murphy@arm.com>,
        Rob Clark <robdclark@gmail.com>,
        Dmitry Baryshkov <dmitry.baryshkov@linaro.org>,
        Rob Clark <robdclark@chromium.org>,
        Sasha Levin <sashal@kernel.org>, sean@poorly.run,
        airlied@linux.ie, daniel@ffwll.ch, linux-arm-msm@vger.kernel.org,
        dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org
Subject: [PATCH AUTOSEL 5.4 11/14] drm/msm: Stop using iommu_present()
Date:   Tue, 19 Apr 2022 14:14:40 -0400
Message-Id: <20220419181444.485959-11-sashal@kernel.org>
In-Reply-To: <20220419181444.485959-1-sashal@kernel.org>
References: <20220419181444.485959-1-sashal@kernel.org>
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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/5ab4f4574d7f3e042261da702d493ee40d003356.1649168268.git.robin.murphy@arm.com
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 407b51cf6790..7322df9cf673 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -303,7 +303,7 @@ 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)
-- 
2.35.1