video: tegra: host: add freq. capping capability

This change adds sysfs interface under acm for capping frequencies of
host1x clients. It is to replace existing nvpmodel kernel driver which
serves same purpose but does this in an unreliable/wrong way -
bypassing host1x and grabbing parent clock handle of clients directly.

With this functionality, things are put under host1x acm control and
we gain more finely grained control in some cases, e.g. setting freq.
cap independently for dla0 and dla1.

Bug 200585348
Bug 200521935

Change-Id: I34445df1abc3656138cfde06c23ea5a4c8694d07
Signed-off-by: Leon Yu <leoyu@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvidia/+/2288876
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Mikko Perttunen <mperttunen@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
GVS: Gerrit_Virtual_Submit

1 files changed, 4 insertions, 1 deletions

diff --git a/include/linux/nvhost.h b/include/linux/nvhost.h
index ade9da2de..56448483c 100644
--- a/include/linux/nvhost.h
+++ b/include/linux/nvhost.h
@@ -3,7 +3,7 @@
  *
  * Tegra graphics host driver
  *
- * Copyright (c) 2009-2019, NVIDIA Corporation. All rights reserved.
+ * Copyright (c) 2009-2020, NVIDIA Corporation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -235,6 +235,9 @@ struct nvhost_device_data {
 
         struct kobject *power_kobj;     /* kobject to hold power sysfs entries */
         struct nvhost_device_power_attr *power_attrib;  /* sysfs attributes */
+        /* kobject to hold clk_cap sysfs entries */
+        struct kobject clk_cap_kobj;
+        struct kobj_attribute *clk_cap_attrs;
         struct dentry *debugfs;         /* debugfs directory */
 
         u32 nvhost_timeout_default;