drm/amdgpu: add the common code to support mclk OD

This implements mclk OverDrive(OD) through sysfs.
The new entry pp_mclk_od is read/write. The value of input/output
is an integer of the overclocking percentage.

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Eric Huang <JinHuiEric.Huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 55 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
index d6484d6e60dd..250f8693f170 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
@@ -527,6 +527,52 @@ fail:
         return count;
 }
 
+static ssize_t amdgpu_get_pp_mclk_od(struct device *dev,
+                struct device_attribute *attr,
+                char *buf)
+{
+        struct drm_device *ddev = dev_get_drvdata(dev);
+        struct amdgpu_device *adev = ddev->dev_private;
+        uint32_t value = 0;
+
+        if (adev->pp_enabled)
+                value = amdgpu_dpm_get_mclk_od(adev);
+        else if (adev->pm.funcs->get_mclk_od)
+                value = adev->pm.funcs->get_mclk_od(adev);
+
+        return snprintf(buf, PAGE_SIZE, "%d\n", value);
+}
+
+static ssize_t amdgpu_set_pp_mclk_od(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;
+        long int value;
+
+        ret = kstrtol(buf, 0, &value);
+
+        if (ret) {
+                count = -EINVAL;
+                goto fail;
+        }
+
+        if (adev->pp_enabled) {
+                amdgpu_dpm_set_mclk_od(adev, (uint32_t)value);
+                amdgpu_dpm_dispatch_task(adev, AMD_PP_EVENT_READJUST_POWER_STATE, NULL, NULL);
+        } else if (adev->pm.funcs->set_mclk_od) {
+                adev->pm.funcs->set_mclk_od(adev, (uint32_t)value);
+                adev->pm.dpm.current_ps = adev->pm.dpm.boot_ps;
+                amdgpu_pm_compute_clocks(adev);
+        }
+
+fail:
+        return count;
+}
+
 static DEVICE_ATTR(power_dpm_state, S_IRUGO | S_IWUSR, amdgpu_get_dpm_state, amdgpu_set_dpm_state);
 static DEVICE_ATTR(power_dpm_force_performance_level, S_IRUGO | S_IWUSR,
                    amdgpu_get_dpm_forced_performance_level,
@@ -551,6 +597,9 @@ static DEVICE_ATTR(pp_dpm_pcie, S_IRUGO | S_IWUSR,
 static DEVICE_ATTR(pp_sclk_od, S_IRUGO | S_IWUSR,
                 amdgpu_get_pp_sclk_od,
                 amdgpu_set_pp_sclk_od);
+static DEVICE_ATTR(pp_mclk_od, S_IRUGO | S_IWUSR,
+                amdgpu_get_pp_mclk_od,
+                amdgpu_set_pp_mclk_od);
 
 static ssize_t amdgpu_hwmon_show_temp(struct device *dev,
                                       struct device_attribute *attr,
@@ -1191,6 +1240,11 @@ int amdgpu_pm_sysfs_init(struct amdgpu_device *adev)
                 DRM_ERROR("failed to create device file pp_sclk_od\n");
                 return ret;
         }
+        ret = device_create_file(adev->dev, &dev_attr_pp_mclk_od);
+        if (ret) {
+                DRM_ERROR("failed to create device file pp_mclk_od\n");
+                return ret;
+        }
 
         ret = amdgpu_debugfs_pm_init(adev);
         if (ret) {
@@ -1219,6 +1273,7 @@ void amdgpu_pm_sysfs_fini(struct amdgpu_device *adev)
         device_remove_file(adev->dev, &dev_attr_pp_dpm_mclk);
         device_remove_file(adev->dev, &dev_attr_pp_dpm_pcie);
         device_remove_file(adev->dev, &dev_attr_pp_sclk_od);
+        device_remove_file(adev->dev, &dev_attr_pp_mclk_od);
 }
 
 void amdgpu_pm_compute_clocks(struct amdgpu_device *adev)