msm: kgsl: Add sysfs control for pwrscale

Add a sysfs entry to enable control of notifications
from pwrscale to devfreq.

Change-Id: Ife0a31e96975239bf4fefd59ac6266568c4db1a5
Signed-off-by: Jonathan Wicks <jwicks@codeaurora.org>

4 files changed, 52 insertions, 5 deletions

diff --git a/drivers/gpu/msm/adreno.c b/drivers/gpu/msm/adreno.c
index 94d828027f20..9940f7a7c2b7 100644
--- a/drivers/gpu/msm/adreno.c
+++ b/drivers/gpu/msm/adreno.c
@@ -1961,7 +1961,7 @@ static int adreno_setproperty(struct kgsl_device_private *dev_priv,
 							KGSL_STATE_ACTIVE);
 				device->pwrctrl.ctrl_flags = KGSL_PWR_ON;
 				adreno_fault_detect_stop(adreno_dev);
-				kgsl_pwrscale_disable(device);
+				kgsl_pwrscale_disable(device, true);
 			}
 
 			mutex_unlock(&device->mutex);
diff --git a/drivers/gpu/msm/kgsl_pwrctrl.c b/drivers/gpu/msm/kgsl_pwrctrl.c
index d71c6a63f2d3..172de7406c26 100644
--- a/drivers/gpu/msm/kgsl_pwrctrl.c
+++ b/drivers/gpu/msm/kgsl_pwrctrl.c
@@ -1387,6 +1387,47 @@ done:
 	return 0;
 }
 
+static ssize_t kgsl_pwrctrl_pwrscale_store(struct device *dev,
+					   struct device_attribute *attr,
+					   const char *buf, size_t count)
+{
+	struct kgsl_device *device = kgsl_device_from_dev(dev);
+	int ret;
+	unsigned int enable = 0;
+
+	if (device == NULL)
+		return 0;
+
+	ret = kgsl_sysfs_store(buf, &enable);
+	if (ret)
+		return ret;
+
+	mutex_lock(&device->mutex);
+
+	if (enable)
+		kgsl_pwrscale_enable(device);
+	else
+		kgsl_pwrscale_disable(device, false);
+
+	mutex_unlock(&device->mutex);
+
+	return count;
+}
+
+static ssize_t kgsl_pwrctrl_pwrscale_show(struct device *dev,
+					  struct device_attribute *attr,
+					  char *buf)
+{
+	struct kgsl_device *device = kgsl_device_from_dev(dev);
+	struct kgsl_pwrscale *psc;
+
+	if (device == NULL)
+		return 0;
+	psc = &device->pwrscale;
+
+	return snprintf(buf, PAGE_SIZE, "%u\n", psc->enabled);
+}
+
 static DEVICE_ATTR(gpuclk, 0644, kgsl_pwrctrl_gpuclk_show,
 	kgsl_pwrctrl_gpuclk_store);
 static DEVICE_ATTR(max_gpuclk, 0644, kgsl_pwrctrl_max_gpuclk_show,
@@ -1449,6 +1490,9 @@ static DEVICE_ATTR(clock_mhz, 0444, kgsl_pwrctrl_clock_mhz_show, NULL);
 static DEVICE_ATTR(freq_table_mhz, 0444,
 	kgsl_pwrctrl_freq_table_mhz_show, NULL);
 static DEVICE_ATTR(temp, 0444, kgsl_pwrctrl_temp_show, NULL);
+static DEVICE_ATTR(pwrscale, 0644,
+	kgsl_pwrctrl_pwrscale_show,
+	kgsl_pwrctrl_pwrscale_store);
 
 static const struct device_attribute *pwrctrl_attr_list[] = {
 	&dev_attr_gpuclk,
@@ -1477,6 +1521,7 @@ static const struct device_attribute *pwrctrl_attr_list[] = {
 	&dev_attr_clock_mhz,
 	&dev_attr_freq_table_mhz,
 	&dev_attr_temp,
+	&dev_attr_pwrscale,
 	NULL
 };
 
diff --git a/drivers/gpu/msm/kgsl_pwrscale.c b/drivers/gpu/msm/kgsl_pwrscale.c
index 01d3b74c16fd..85cd29b5364e 100644
--- a/drivers/gpu/msm/kgsl_pwrscale.c
+++ b/drivers/gpu/msm/kgsl_pwrscale.c
@@ -189,19 +189,21 @@ EXPORT_SYMBOL(kgsl_pwrscale_update);
 /*
  * kgsl_pwrscale_disable - temporarily disable the governor
  * @device: The device
+ * @turbo: Indicates if pwrlevel should be forced to turbo
  *
  * Temporarily disable the governor, to prevent interference
  * with profiling tools that expect a fixed clock frequency.
  * This function must be called with the device mutex locked.
  */
-void kgsl_pwrscale_disable(struct kgsl_device *device)
+void kgsl_pwrscale_disable(struct kgsl_device *device, bool turbo)
 {
 	BUG_ON(!mutex_is_locked(&device->mutex));
 	if (device->pwrscale.devfreqptr)
 		queue_work(device->pwrscale.devfreq_wq,
 			&device->pwrscale.devfreq_suspend_ws);
 	device->pwrscale.enabled = false;
-	kgsl_pwrctrl_pwrlevel_change(device, KGSL_PWRLEVEL_TURBO);
+	if (turbo)
+		kgsl_pwrctrl_pwrlevel_change(device, KGSL_PWRLEVEL_TURBO);
 }
 EXPORT_SYMBOL(kgsl_pwrscale_disable);
 
diff --git a/drivers/gpu/msm/kgsl_pwrscale.h b/drivers/gpu/msm/kgsl_pwrscale.h
index c85317869f1d..0756a4490f22 100644
--- a/drivers/gpu/msm/kgsl_pwrscale.h
+++ b/drivers/gpu/msm/kgsl_pwrscale.h
@@ -1,4 +1,4 @@
-/* Copyright (c) 2010-2015, The Linux Foundation. All rights reserved.
+/* Copyright (c) 2010-2016, The Linux Foundation. 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 version 2 and
@@ -123,7 +123,7 @@ void kgsl_pwrscale_sleep(struct kgsl_device *device);
 void kgsl_pwrscale_wake(struct kgsl_device *device);
 
 void kgsl_pwrscale_enable(struct kgsl_device *device);
-void kgsl_pwrscale_disable(struct kgsl_device *device);
+void kgsl_pwrscale_disable(struct kgsl_device *device, bool turbo);
 
 int kgsl_devfreq_target(struct device *dev, unsigned long *freq, u32 flags);
 int kgsl_devfreq_get_dev_status(struct device *, struct devfreq_dev_status *);