[PATCH v2 1/1] drm/radeon: Add sclk frequency as hwmon sensor

[Alex Deucher]

Applied.  Thanks!

Alex

On Wed, Sep 9, 2020 at 7:04 AM Sandeep Raghuraman <sandy.8925 at gmail.com> wrote:
>
> This patch adds support for reporting sclk values for Radeon GPUs, where supported.
>
> Signed-off-by: Sandeep Raghuraman <sandy.8925 at gmail.com>
> ---
>  drivers/gpu/drm/radeon/radeon_pm.c | 29 ++++++++++++++++++++++++++++-
>  1 file changed, 28 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/radeon/radeon_pm.c b/drivers/gpu/drm/radeon/radeon_pm.c
> index 8c5d6fda0d75..05c4196a8212 100644
> --- 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 */
> --
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