drm/radeon: Add sclk frequency as hwmon sensor

This patch adds support for reporting sclk values for Radeon GPUs, where supported.

Signed-off-by: Sandeep Raghuraman <sandy.8925@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/radeon/radeon_pm.c b/drivers/gpu/drm/radeon/radeon_pm.c
index 8c5d6fd..05c4196 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_pm.c
+++ b/drivers/gpu/drm/radeon/radeon_pm.c
@@ -712,6 +712,31 @@ static SENSOR_DEVICE_ATTR(pwm1_enable, S_IRUGO | S_IWUSR, radeon_hwmon_get_pwm1_
 static SENSOR_DEVICE_ATTR(pwm1_min, S_IRUGO, radeon_hwmon_get_pwm1_min, NULL, 0);
 static SENSOR_DEVICE_ATTR(pwm1_max, S_IRUGO, radeon_hwmon_get_pwm1_max, NULL, 0);
 
+static ssize_t radeon_hwmon_show_sclk(struct device *dev,
+                                     struct device_attribute *attr, char *buf)
+{
+       struct radeon_device *rdev = dev_get_drvdata(dev);
+       struct drm_device *ddev = rdev->ddev;
+       u32 sclk = 0;
+
+       /* Can't get clock frequency when the card is off */
+       if ((rdev->flags & RADEON_IS_PX) &&
+           (ddev->switch_power_state != DRM_SWITCH_POWER_ON))
+               return -EINVAL;
+
+       if (rdev->asic->dpm.get_current_sclk)
+               sclk = radeon_dpm_get_current_sclk(rdev);
+
+       /* Value returned by dpm is in 10 KHz units, need to convert it into Hz 
+          for hwmon */
+       sclk *= 10000;
+
+       return snprintf(buf, PAGE_SIZE, "%u\n", sclk);
+}
+
+static SENSOR_DEVICE_ATTR(freq1_input, S_IRUGO, radeon_hwmon_show_sclk, NULL,
+                         0);
+
 
 static struct attribute *hwmon_attributes[] = {
        &sensor_dev_attr_temp1_input.dev_attr.attr,
@@ -721,6 +746,7 @@ static struct attribute *hwmon_attributes[] = {
        &sensor_dev_attr_pwm1_enable.dev_attr.attr,
        &sensor_dev_attr_pwm1_min.dev_attr.attr,
        &sensor_dev_attr_pwm1_max.dev_attr.attr,
+       &sensor_dev_attr_freq1_input.dev_attr.attr,
        NULL
 };
 
@@ -738,7 +764,8 @@ static umode_t hwmon_attributes_visible(struct kobject *kobj,
             attr == &sensor_dev_attr_pwm1.dev_attr.attr ||
             attr == &sensor_dev_attr_pwm1_enable.dev_attr.attr ||
             attr == &sensor_dev_attr_pwm1_max.dev_attr.attr ||
-            attr == &sensor_dev_attr_pwm1_min.dev_attr.attr))
+            attr == &sensor_dev_attr_pwm1_min.dev_attr.attr ||
+            attr == &sensor_dev_attr_freq1_input.dev_attr.attr))
                return 0;
 
        /* Skip fan attributes if fan is not present */