video: tegra: host: register nvhost master device in board-xxx-panel.c

- the suspend order of devices is governed by the order
in which devices are registered
- this commit ensures that nvhost master is registered before
any of the graphics devices
- previously this was done in rootfs_init call which is
later than arch_init calls of board-xxx-panel.c
- this caused tegra-dc device to be registered *before* nvhost
master device. as a result it was suspended *later* than nvhost
master device. this is a clear violation of dependency rule
for nvhost. this caused suspend-resume to fail for L4T
- this worked on android as it has CONFIG early suspend enabled
while it failed for L4T which doesn't have CONFIG early suspend
enabled

Bug 947617

Change-Id: I6cd405f3ba23d004e7659140019f5130e6c25159
Signed-off-by: Mayuresh Kulkarni <mkulkarni@nvidia.com>
Reviewed-on: http://git-master/r/87756
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 3 insertions, 8 deletions

diff --git a/drivers/video/tegra/host/dev.c b/drivers/video/tegra/host/dev.c
index fa8c6176fcbc..b2575860e91b 100644
--- a/drivers/video/tegra/host/dev.c
+++ b/drivers/video/tegra/host/dev.c
@@ -1072,7 +1072,8 @@ static int __exit nvhost_remove(struct nvhost_device *dev)
 static int nvhost_suspend(struct nvhost_device *dev, pm_message_t state)
 {
 	struct nvhost_master *host = nvhost_get_drvdata(dev);
-	int i, ret;
+	int i, ret = 0;
+
 	dev_info(&dev->dev, "suspending\n");
 
 	for (i = 0; i < host->nb_channels; i++) {
@@ -1083,6 +1084,7 @@ static int nvhost_suspend(struct nvhost_device *dev, pm_message_t state)
 
 	ret = nvhost_module_suspend(host->dev, true);
 	dev_info(&dev->dev, "suspend status: %d\n", ret);
+
 	return ret;
 }
 
@@ -1105,14 +1107,7 @@ static struct nvhost_driver nvhost_driver = {
 
 static int __init nvhost_mod_init(void)
 {
-	int err;
-
 	register_sets = tegra_gpu_register_sets();
-
-	err = nvhost_device_register(&tegra_grhost_device);
-	if (err)
-		return err;
-
 	return nvhost_driver_register(&nvhost_driver);
 }