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, 7 insertions, 2 deletions

diff --git a/arch/arm/mach-tegra/board-enterprise-panel.c b/arch/arm/mach-tegra/board-enterprise-panel.c
index 0defe56a7bc7..9be8582e1be6 100644
--- a/arch/arm/mach-tegra/board-enterprise-panel.c
+++ b/arch/arm/mach-tegra/board-enterprise-panel.c
@@ -709,8 +709,6 @@ struct early_suspend enterprise_panel_early_suspender;
 
 static void enterprise_panel_early_suspend(struct early_suspend *h)
 {
-	unsigned i;
-
 	/* power down LCD, add use a black screen for HDMI */
 	if (num_registered_fb > 0)
 		fb_blank(registered_fb[0], FB_BLANK_POWERDOWN);
@@ -733,6 +731,7 @@ static void enterprise_panel_early_suspend(struct early_suspend *h)
 static void enterprise_panel_late_resume(struct early_suspend *h)
 {
 	unsigned i;
+
 #ifdef CONFIG_TEGRA_CONVSERVATIVE_GOV_ON_EARLYSUPSEND
 	cpufreq_restore_default_governor();
 #endif
@@ -786,6 +785,12 @@ int __init enterprise_panel_init(void)
 	register_early_suspend(&enterprise_panel_early_suspender);
 #endif
 
+#ifdef CONFIG_TEGRA_GRHOST
+	err = nvhost_device_register(&tegra_grhost_device);
+	if (err)
+		return err;
+#endif
+
 	err = platform_add_devices(enterprise_gfx_devices,
 				ARRAY_SIZE(enterprise_gfx_devices));