drm/radeon/dpm: add helper to fetch the vrefresh of the current mode

Needed for DPM on CI.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 18 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/r600_dpm.c b/drivers/gpu/drm/radeon/r600_dpm.c
index 89c46c55f93d..26a787836032 100644
--- a/drivers/gpu/drm/radeon/r600_dpm.c
+++ b/drivers/gpu/drm/radeon/r600_dpm.c
@@ -174,6 +174,24 @@ u32 r600_dpm_get_vblank_time(struct radeon_device *rdev)
         return vblank_time_us;
 }
 
+u32 r600_dpm_get_vrefresh(struct radeon_device *rdev)
+{
+        struct drm_device *dev = rdev->ddev;
+        struct drm_crtc *crtc;
+        struct radeon_crtc *radeon_crtc;
+        u32 vrefresh = 0;
+
+        list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
+                radeon_crtc = to_radeon_crtc(crtc);
+                if (crtc->enabled && radeon_crtc->enabled && radeon_crtc->hw_mode.clock) {
+                        vrefresh = radeon_crtc->hw_mode.vrefresh;
+                        break;
+                }
+        }
+
+        return vrefresh;
+}
+
 void r600_calculate_u_and_p(u32 i, u32 r_c, u32 p_b,
                             u32 *p, u32 *u)
 {