BACKPORT: devfreq_cooling: pass a pointer to devfreq in the power model callbacks

When the devfreq cooling device was designed, it was an oversight not to
pass a pointer to the struct devfreq as the first parameters of the
callbacks.  The design patterns of the kernel suggest it for a good
reason.

By passing a pointer to struct devfreq, the driver can register one
function that works with multiple devices.  With the current
implementation, a driver that can work with multiple devices has to
create multiple copies of the same function with different parameters so
that each devfreq_cooling_device can use the appropriate one.  By
passing a pointer to struct devfreq, the driver can identify which
device it's referring to.

Change-Id: I384bf9aafd2391eccab2ca6a76e4e57f2740aa6b
Cc: Zhang Rui <rui.zhang@intel.com>
Cc: Eduardo Valentin <edubezval@gmail.com>
Reviewed-by: Punit Agrawal <punit.agrawal@arm.com>
Reviewed-by: Ørjan Eide <orjan.eide@arm.com>
Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
Signed-off-by: Javi Merino <javi.merino@arm.com>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
Signed-off-by: Tao Huang <huangtao@rock-chips.com>
(cherry picked from commit 3aa5374376)

drivers/devfreq/rockchip_dmc.c

@@ -2225,7 +2225,8 @@ static struct devfreq_governor devfreq_dmc_ondemand = {
 	.event_handler = devfreq_dmc_ondemand_handler,
 };
 
-static unsigned long model_static_power(unsigned long voltage)
+static unsigned long model_static_power(struct devfreq *devfreq,
+					unsigned long voltage)
 {
 	struct rockchip_dmcfreq *dmcfreq = rk_dmcfreq;
 	struct device *dev = dmcfreq->dev;
@@ -2267,7 +2268,8 @@ static unsigned long model_static_power(unsigned long voltage)
 		* temp_scaling_factor) / 1000000;
 }
 
-static unsigned long model_dynamic_power(unsigned long freq,
+static unsigned long model_dynamic_power(struct devfreq *devfreq,
+					 unsigned long freq,
 					 unsigned long voltage)
 {
 	/*

drivers/gpu/arm/mali400/mali/platform/arm/arm.c

@@ -183,7 +183,8 @@ static struct resource mali_gpu_resources_m400_mp2[] = {
 static struct thermal_zone_device *gpu_tz;
 
 /* Calculate gpu static power example for reference */
-static unsigned long arm_model_static_power(unsigned long voltage)
+static unsigned long arm_model_static_power(struct devfreq *devfreq,
+					    unsigned long voltage)
 {
 	int temperature, temp;
 	int temp_squared, temp_cubed, temp_scaling_factor;
@@ -223,7 +224,8 @@ static unsigned long arm_model_static_power(unsigned long voltage)
 }
 
 /* Calculate gpu dynamic power example for reference */
-static unsigned long arm_model_dynamic_power(unsigned long freq,
+static unsigned long arm_model_dynamic_power(struct devfreq *devfreq,
+		unsigned long freq,
 		unsigned long voltage)
 {
 	/* The inputs: freq (f) is in Hz, and voltage (v) in mV.

drivers/gpu/arm/mali400/mali/platform/rk/rk.c

@@ -301,7 +301,8 @@ static int power_model_simple_init(struct platform_device *pdev)
 }
 
 /* Calculate gpu static power example for reference */
-static unsigned long rk_model_static_power(unsigned long voltage)
+static unsigned long rk_model_static_power(struct devfreq *devfreq,
+					   unsigned long voltage)
 {
 	int temperature, temp;
 	int temp_squared, temp_cubed, temp_scaling_factor;
@@ -340,7 +341,8 @@ static unsigned long rk_model_static_power(unsigned long voltage)
 }
 
 /* Calculate gpu dynamic power example for reference */
-static unsigned long rk_model_dynamic_power(unsigned long freq,
+static unsigned long rk_model_dynamic_power(struct devfreq *devfreq,
+					    unsigned long freq,
 					    unsigned long voltage)
 {
 	/* The inputs: freq (f) is in Hz, and voltage (v) in mV.

drivers/gpu/arm/midgard/backend/gpu/mali_kbase_power_model_simple.c

@@ -34,7 +34,8 @@ static u32 static_coefficient;
 static s32 ts[4];
 static struct thermal_zone_device *gpu_tz;
 
-static unsigned long model_static_power(unsigned long voltage)
+static unsigned long model_static_power(struct devfreq *devfreq,
+					unsigned long voltage)
 {
 #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 3, 0)
 	unsigned long temperature;
@@ -75,7 +76,8 @@ static unsigned long model_static_power(unsigned long voltage)
 				/ 1000000;
 }
 
-static unsigned long model_dynamic_power(unsigned long freq,
+static unsigned long model_dynamic_power(struct devfreq *devfreq,
+		unsigned long freq,
 		unsigned long voltage)
 {
 	/* The inputs: freq (f) is in Hz, and voltage (v) in mV.

drivers/gpu/arm/midgard_for_linux/backend/gpu/mali_kbase_power_model_simple.c

@@ -34,7 +34,8 @@ static u32 static_coefficient;
 static s32 ts[4];
 static struct thermal_zone_device *gpu_tz;
 
-static unsigned long model_static_power(unsigned long voltage)
+static unsigned long model_static_power(struct devfreq *devfreq,
+					unsigned long voltage)
 {
 #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 3, 0)
 	unsigned long temperature;
@@ -75,7 +76,8 @@ static unsigned long model_static_power(unsigned long voltage)
 				/ 1000000;
 }
 
-static unsigned long model_dynamic_power(unsigned long freq,
+static unsigned long model_dynamic_power(struct devfreq *devfreq,
+		unsigned long freq,
 		unsigned long voltage)
 {
 	/* The inputs: freq (f) is in Hz, and voltage (v) in mV.

drivers/staging/imgtec/rogue/rk3368/rk_init_v2.c

@@ -436,7 +436,8 @@ static u32 static_coefficient;
 static s32 ts[4];
 static struct thermal_zone_device *gpu_tz;
 
-static unsigned long model_static_power(unsigned long voltage)
+static unsigned long model_static_power(struct devfreq *devfreq,
+					unsigned long voltage)
 {
 #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 3, 0)
 	unsigned long temperature;
@@ -477,7 +478,8 @@ static unsigned long model_static_power(unsigned long voltage)
 				/ 1000000;
 }
 
-static unsigned long model_dynamic_power(unsigned long freq,
+static unsigned long model_dynamic_power(struct devfreq *devfreq,
+		unsigned long freq,
 		unsigned long voltage)
 {
 	/* The inputs: freq (f) is in Hz, and voltage (v) in mV.

drivers/thermal/devfreq_cooling.c

@@ -238,7 +238,7 @@ get_static_power(struct devfreq_cooling_device *dfc, unsigned long freq)
 		return 0;
 	}
 
-	return dfc->power_ops->get_static_power(voltage);
+	return dfc->power_ops->get_static_power(df, voltage);
 }
 
 /**
@@ -262,7 +262,8 @@ get_dynamic_power(struct devfreq_cooling_device *dfc, unsigned long freq,
 	struct devfreq_cooling_power *dfc_power = dfc->power_ops;
 
 	if (dfc_power->get_dynamic_power)
-		return dfc_power->get_dynamic_power(freq, voltage);
+		return dfc_power->get_dynamic_power(dfc->devfreq, freq,
+						    voltage);
 
 	freq_mhz = freq / 1000000;
 	power = (u64)dfc_power->dyn_power_coeff * freq_mhz * voltage * voltage;

include/linux/devfreq_cooling.h

@@ -37,8 +37,10 @@
  *			@dyn_power_coeff * frequency * voltage^2
  */
 struct devfreq_cooling_power {
-	unsigned long (*get_static_power)(unsigned long voltage);
-	unsigned long (*get_dynamic_power)(unsigned long freq,
+	unsigned long (*get_static_power)(struct devfreq *devfreq,
+					  unsigned long voltage);
+	unsigned long (*get_dynamic_power)(struct devfreq *devfreq,
+					   unsigned long freq,
 					   unsigned long voltage);
 	unsigned long dyn_power_coeff;
 };