[PATCH 2/2] drm/radeon: Add vddc hwmon sensor

[Alex Deucher]

On Sun, Aug 30, 2020 at 3:26 AM Sandeep Raghuraman <sandy.8925 at gmail.com> wrote:
>

Please add a commit message.  Also, split this into 2-3 patches:
1. add the new dpm callback
2. add the sumo implementation of the new callback (could be combined with 1)
3. expose the voltage via hwmon

For the last patch, you probably also want to adjust
hwmon_attributes_visible() to hide the voltage on asics which don't
have the callback.

Thanks!

Alex

> Signed-off-by: Sandeep Raghuraman <sandy.8925 at gmail.com>
> ---
>  drivers/gpu/drm/radeon/radeon.h      |  1 +
>  drivers/gpu/drm/radeon/radeon_asic.c |  1 +
>  drivers/gpu/drm/radeon/radeon_asic.h |  1 +
>  drivers/gpu/drm/radeon/radeon_pm.c   | 21 +++++++++++++++++++++
>  drivers/gpu/drm/radeon/sumo_dpm.c    | 20 ++++++++++++++++++++
>  5 files changed, 44 insertions(+)
>
> diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
> index 30e32adc1fc6..ec82f22e503a 100644
> --- a/drivers/gpu/drm/radeon/radeon.h
> +++ b/drivers/gpu/drm/radeon/radeon.h
> @@ -1992,6 +1992,7 @@ struct radeon_asic {
>                 int (*get_fan_speed_percent)(struct radeon_device *rdev, u32 *speed);
>                 u32 (*get_current_sclk)(struct radeon_device *rdev);
>                 u32 (*get_current_mclk)(struct radeon_device *rdev);
> +               u16 (*get_current_vddc)(struct radeon_device *rdev);
>         } dpm;
>         /* pageflipping */
>         struct {
> diff --git a/drivers/gpu/drm/radeon/radeon_asic.c b/drivers/gpu/drm/radeon/radeon_asic.c
> index 495700d16fc9..8becbe09af2f 100644
> --- a/drivers/gpu/drm/radeon/radeon_asic.c
> +++ b/drivers/gpu/drm/radeon/radeon_asic.c
> @@ -1513,6 +1513,7 @@ static struct radeon_asic sumo_asic = {
>                 .force_performance_level = &sumo_dpm_force_performance_level,
>                 .get_current_sclk = &sumo_dpm_get_current_sclk,
>                 .get_current_mclk = &sumo_dpm_get_current_mclk,
> +               .get_current_vddc = &sumo_dpm_get_current_vddc,
>         },
>         .pflip = {
>                 .page_flip = &evergreen_page_flip,
> diff --git a/drivers/gpu/drm/radeon/radeon_asic.h b/drivers/gpu/drm/radeon/radeon_asic.h
> index a74fa18cd27b..24644daead53 100644
> --- a/drivers/gpu/drm/radeon/radeon_asic.h
> +++ b/drivers/gpu/drm/radeon/radeon_asic.h
> @@ -596,6 +596,7 @@ int sumo_dpm_force_performance_level(struct radeon_device *rdev,
>                                      enum radeon_dpm_forced_level level);
>  u32 sumo_dpm_get_current_sclk(struct radeon_device *rdev);
>  u32 sumo_dpm_get_current_mclk(struct radeon_device *rdev);
> +u16 sumo_dpm_get_current_vddc(struct radeon_device *rdev);
>
>  /*
>   * cayman
> diff --git a/drivers/gpu/drm/radeon/radeon_pm.c b/drivers/gpu/drm/radeon/radeon_pm.c
> index 05c4196a8212..f02386a0d988 100644
> --- a/drivers/gpu/drm/radeon/radeon_pm.c
> +++ b/drivers/gpu/drm/radeon/radeon_pm.c
> @@ -737,6 +737,26 @@ static ssize_t radeon_hwmon_show_sclk(struct device *dev,
>  static SENSOR_DEVICE_ATTR(freq1_input, S_IRUGO, radeon_hwmon_show_sclk, NULL,
>                           0);
>
> +static ssize_t radeon_hwmon_show_vddc(struct device *dev,
> +                                     struct device_attribute *attr, char *buf)
> +{
> +       struct radeon_device *rdev = dev_get_drvdata(dev);
> +       struct drm_device *ddev = rdev->ddev;
> +       u16 vddc = 0;
> +
> +       /* Can't get vddc 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_vddc)
> +               vddc = rdev->asic->dpm.get_current_vddc(rdev);
> +
> +       return snprintf(buf, PAGE_SIZE, "%u\n", vddc);
> +}
> +
> +static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, radeon_hwmon_show_vddc, NULL,
> +                         0);
>
>  static struct attribute *hwmon_attributes[] = {
>         &sensor_dev_attr_temp1_input.dev_attr.attr,
> @@ -747,6 +767,7 @@ static struct attribute *hwmon_attributes[] = {
>         &sensor_dev_attr_pwm1_min.dev_attr.attr,
>         &sensor_dev_attr_pwm1_max.dev_attr.attr,
>         &sensor_dev_attr_freq1_input.dev_attr.attr,
> +       &sensor_dev_attr_in0_input.dev_attr.attr,
>         NULL
>  };
>
> diff --git a/drivers/gpu/drm/radeon/sumo_dpm.c b/drivers/gpu/drm/radeon/sumo_dpm.c
> index b95d5d390caf..f74f381af05f 100644
> --- a/drivers/gpu/drm/radeon/sumo_dpm.c
> +++ b/drivers/gpu/drm/radeon/sumo_dpm.c
> @@ -1865,6 +1865,26 @@ u32 sumo_dpm_get_current_mclk(struct radeon_device *rdev)
>         return pi->sys_info.bootup_uma_clk;
>  }
>
> +u16 sumo_dpm_get_current_vddc(struct radeon_device *rdev)
> +{
> +       struct sumo_power_info *pi = sumo_get_pi(rdev);
> +       struct radeon_ps *rps = &pi->current_rps;
> +       struct sumo_ps *ps = sumo_get_ps(rps);
> +       struct sumo_pl *pl;
> +       u32 current_index =
> +               (RREG32(TARGET_AND_CURRENT_PROFILE_INDEX) & CURR_INDEX_MASK) >>
> +               CURR_INDEX_SHIFT;
> +
> +       if (current_index == BOOST_DPM_LEVEL) {
> +               pl = &pi->boost_pl;
> +       } else if (current_index >= ps->num_levels) {
> +               return 0;
> +       } else {
> +               pl = &ps->levels[current_index];
> +       }
> +       return sumo_convert_voltage_index_to_value(rdev, pl->vddc_index);
> +}
> +
>  void sumo_dpm_fini(struct radeon_device *rdev)
>  {
>         int i;
> --
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