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>

1 files changed, 45 insertions, 0 deletions

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
 };