From: Thierry Reding <treding@nvidia.com>
Date: Tue, 3 Dec 2019 16:19:12 +0000 (+0100)
Subject: drm/tegra: Silence expected errors on IOMMU attach
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=a8817489dc3e3b1910842958a3b9d9e4832e99b0;p=linux.git

drm/tegra: Silence expected errors on IOMMU attach

Subdevices may not be hooked up to an IOMMU via device tree. Detect such
situations and avoid confusing users by not emitting an error message.

Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Thierry Reding <treding@nvidia.com>
---

diff --git a/drivers/gpu/drm/tegra/dc.c b/drivers/gpu/drm/tegra/dc.c
index 85d3c9ad29df2..714af052fbefe 100644
--- a/drivers/gpu/drm/tegra/dc.c
+++ b/drivers/gpu/drm/tegra/dc.c
@@ -2017,7 +2017,7 @@ static int tegra_dc_init(struct host1x_client *client)
 		dev_warn(dc->dev, "failed to allocate syncpoint\n");
 
 	err = host1x_client_iommu_attach(client);
-	if (err < 0) {
+	if (err < 0 && err != -ENODEV) {
 		dev_err(client->dev, "failed to attach to domain: %d\n", err);
 		return err;
 	}
diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c
index 56e5e7a5c108e..7a16b51eaa2da 100644
--- a/drivers/gpu/drm/tegra/drm.c
+++ b/drivers/gpu/drm/tegra/drm.c
@@ -920,10 +920,8 @@ int host1x_client_iommu_attach(struct host1x_client *client)
 
 	if (tegra->domain) {
 		group = iommu_group_get(client->dev);
-		if (!group) {
-			dev_err(client->dev, "failed to get IOMMU group\n");
+		if (!group)
 			return -ENODEV;
-		}
 
 		if (domain != tegra->domain) {
 			err = iommu_attach_group(tegra->domain, group);
diff --git a/drivers/gpu/drm/tegra/vic.c b/drivers/gpu/drm/tegra/vic.c
index c4d82b8b30650..3526c2892ddb2 100644
--- a/drivers/gpu/drm/tegra/vic.c
+++ b/drivers/gpu/drm/tegra/vic.c
@@ -167,7 +167,7 @@ static int vic_init(struct host1x_client *client)
 	int err;
 
 	err = host1x_client_iommu_attach(client);
-	if (err < 0) {
+	if (err < 0 && err != -ENODEV) {
 		dev_err(vic->dev, "failed to attach to domain: %d\n", err);
 		return err;
 	}