drm/amd/powerplay: support retrieving and adjusting fclock power levels V2

User can use "pp_dpm_fclk" to retrieve and adjust fclock power
levels.

V2: expose this interface for Vega20 and later ASICs only

Signed-off-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 51 insertions, 2 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
index 4bdb1d082bea..23eb6f61da13 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
@@ -680,13 +680,14 @@ static ssize_t amdgpu_get_ppfeature_status(struct device *dev,
 }
 
 /**
- * DOC: pp_dpm_sclk pp_dpm_mclk pp_dpm_socclk pp_dpm_pcie
+ * DOC: pp_dpm_sclk pp_dpm_mclk pp_dpm_socclk pp_dpm_fclk pp_dpm_pcie
  *
  * The amdgpu driver provides a sysfs API for adjusting what power levels
  * are enabled for a given power state.  The files pp_dpm_sclk, pp_dpm_mclk,
- * pp_dpm_socclk and pp_dpm_pcie are used for this.
+ * pp_dpm_socclk, pp_dpm_fclk and pp_dpm_pcie are used for this.
  *
  * pp_dpm_socclk interface is only available for Vega10 and later ASICs.
+ * pp_dpm_fclk interface is only available for Vega20 and later ASICs.
  *
  * Reading back the files will show you the available power levels within
  * the power state and the clock information for those levels.
@@ -842,6 +843,42 @@ static ssize_t amdgpu_set_pp_dpm_socclk(struct device *dev,
         return count;
 }
 
+static ssize_t amdgpu_get_pp_dpm_fclk(struct device *dev,
+                struct device_attribute *attr,
+                char *buf)
+{
+        struct drm_device *ddev = dev_get_drvdata(dev);
+        struct amdgpu_device *adev = ddev->dev_private;
+
+        if (adev->powerplay.pp_funcs->print_clock_levels)
+                return amdgpu_dpm_print_clock_levels(adev, PP_FCLK, buf);
+        else
+                return snprintf(buf, PAGE_SIZE, "\n");
+}
+
+static ssize_t amdgpu_set_pp_dpm_fclk(struct device *dev,
+                struct device_attribute *attr,
+                const char *buf,
+                size_t count)
+{
+        struct drm_device *ddev = dev_get_drvdata(dev);
+        struct amdgpu_device *adev = ddev->dev_private;
+        int ret;
+        uint32_t mask = 0;
+
+        ret = amdgpu_read_mask(buf, count, &mask);
+        if (ret)
+                return ret;
+
+        if (adev->powerplay.pp_funcs->force_clock_level)
+                ret = amdgpu_dpm_force_clock_level(adev, PP_FCLK, mask);
+
+        if (ret)
+                return -EINVAL;
+
+        return count;
+}
+
 static ssize_t amdgpu_get_pp_dpm_pcie(struct device *dev,
                 struct device_attribute *attr,
                 char *buf)
@@ -1128,6 +1165,9 @@ static DEVICE_ATTR(pp_dpm_mclk, S_IRUGO | S_IWUSR,
 static DEVICE_ATTR(pp_dpm_socclk, S_IRUGO | S_IWUSR,
                 amdgpu_get_pp_dpm_socclk,
                 amdgpu_set_pp_dpm_socclk);
+static DEVICE_ATTR(pp_dpm_fclk, S_IRUGO | S_IWUSR,
+                amdgpu_get_pp_dpm_fclk,
+                amdgpu_set_pp_dpm_fclk);
 static DEVICE_ATTR(pp_dpm_pcie, S_IRUGO | S_IWUSR,
                 amdgpu_get_pp_dpm_pcie,
                 amdgpu_set_pp_dpm_pcie);
@@ -2294,6 +2334,13 @@ int amdgpu_pm_sysfs_init(struct amdgpu_device *adev)
                         return ret;
                 }
         }
+        if (adev->asic_type >= CHIP_VEGA20) {
+                ret = device_create_file(adev->dev, &dev_attr_pp_dpm_fclk);
+                if (ret) {
+                        DRM_ERROR("failed to create device file pp_dpm_fclk\n");
+                        return ret;
+                }
+        }
         ret = device_create_file(adev->dev, &dev_attr_pp_dpm_pcie);
         if (ret) {
                 DRM_ERROR("failed to create device file pp_dpm_pcie\n");
@@ -2384,6 +2431,8 @@ void amdgpu_pm_sysfs_fini(struct amdgpu_device *adev)
         if (adev->asic_type >= CHIP_VEGA10)
                 device_remove_file(adev->dev, &dev_attr_pp_dpm_socclk);
         device_remove_file(adev->dev, &dev_attr_pp_dpm_pcie);
+        if (adev->asic_type >= CHIP_VEGA20)
+                device_remove_file(adev->dev, &dev_attr_pp_dpm_fclk);
         device_remove_file(adev->dev, &dev_attr_pp_sclk_od);
         device_remove_file(adev->dev, &dev_attr_pp_mclk_od);
         device_remove_file(adev->dev,