drm/amdgpu: expose the minimum shader/memory clock frequency

Otherwise, some UMD tools will treate them as 0 at default while
actually they are not.
Signed-off-by: NEvan Quan <evan.quan@amd.com>
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c

@@ -785,9 +785,15 @@ int amdgpu_info_ioctl(struct drm_device *dev, void *data, struct drm_file *filp)
 		if (adev->pm.dpm_enabled) {
 			dev_info->max_engine_clock = amdgpu_dpm_get_sclk(adev, false) * 10;
 			dev_info->max_memory_clock = amdgpu_dpm_get_mclk(adev, false) * 10;
+			dev_info->min_engine_clock = amdgpu_dpm_get_sclk(adev, true) * 10;
+			dev_info->min_memory_clock = amdgpu_dpm_get_mclk(adev, true) * 10;
 		} else {
-			dev_info->max_engine_clock = adev->clock.default_sclk * 10;
-			dev_info->max_memory_clock = adev->clock.default_mclk * 10;
+			dev_info->max_engine_clock =
+				dev_info->min_engine_clock =
+					adev->clock.default_sclk * 10;
+			dev_info->max_memory_clock =
+				dev_info->min_memory_clock =
+					adev->clock.default_mclk * 10;
 		}
 		dev_info->enabled_rb_pipes_mask = adev->gfx.config.backend_enable_mask;
 		dev_info->num_rb_pipes = adev->gfx.config.max_backends_per_se *

include/uapi/drm/amdgpu_drm.h

@@ -1111,6 +1111,8 @@ struct drm_amdgpu_info_device {
 	__u32 pa_sc_tile_steering_override;
 	/* disabled TCCs */
 	__u64 tcc_disabled_mask;
+	__u64 min_engine_clock;
+	__u64 min_memory_clock;
 };
 
 struct drm_amdgpu_info_hw_ip {