gpu: nvgpu: add QoS notifier for common clk framework

Define specific QoS notifier for common clk framework
and protect it with CONFIG_COMMON_CLK

This new API will first get min/max requirements from
pm_qos and set min/max freq values in devfreq

A call to update_devfreq() will then ensure that
new estimated frequency is clipped appropriately
between min and max values
This also ensures that frequency is set along with
all the book-keeping

Add below platform specific notifier callback and use it
with pm_qos_add_notifier()
int (*qos_notify)()
If qos_notify is set, then only register the callback

We currently support only one qos_id which is treated
as notifier for min frequency
Remove dependency on qos_id, and use appropriate QoS
APIs like pm_qos_read_min/max_bound()

Store devfreq's min/max frequency in struct gk20a
for reference

Bug 1772462

Change-Id: I63d6d17451d19c9d376b67df7db775b38929287d
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: http://git-master/r/1161161
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/gk20a_scale.h b/drivers/gpu/nvgpu/gk20a/gk20a_scale.h
index 5c8618eb..025c2070 100644
--- a/drivers/gpu/nvgpu/gk20a/gk20a_scale.h
+++ b/drivers/gpu/nvgpu/gk20a/gk20a_scale.h
@@ -47,11 +47,18 @@ void gk20a_scale_notify_idle(struct device *);
 
 void gk20a_scale_suspend(struct device *);
 void gk20a_scale_resume(struct device *);
+int gk20a_scale_qos_notify(struct notifier_block *nb,
+                        unsigned long n, void *p);
 #else
 static inline void gk20a_scale_notify_busy(struct device *dev) {}
 static inline void gk20a_scale_notify_idle(struct device *dev) {}
 static inline void gk20a_scale_suspend(struct device *dev) {}
 static inline void gk20a_scale_resume(struct device *dev) {}
+static inline int gk20a_scale_qos_notify(struct notifier_block *nb,
+                        unsigned long n, void *p)
+{
+        return -ENOSYS;
+}
 #endif
 
 #endif