drm/radeon/dpm: save some display parameters for DPM

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

drivers/gpu/drm/radeon/evergreen.c

@@ -2267,6 +2267,10 @@ static void evergreen_program_watermarks(struct radeon_device *rdev,
 	WREG32(PRIORITY_A_CNT + radeon_crtc->crtc_offset, priority_a_cnt);
 	WREG32(PRIORITY_B_CNT + radeon_crtc->crtc_offset, priority_b_cnt);
 
+	/* save values for DPM */
+	radeon_crtc->line_time = line_time;
+	radeon_crtc->wm_high = latency_watermark_a;
+	radeon_crtc->wm_low = latency_watermark_b;
 }
 
 /**

drivers/gpu/drm/radeon/radeon_mode.h

@@ -331,6 +331,10 @@ struct radeon_crtc {
 	u32 pll_flags;
 	struct drm_encoder *encoder;
 	struct drm_connector *connector;
+	/* for dpm */
+	u32 line_time;
+	u32 wm_low;
+	u32 wm_high;
 };
 
 struct radeon_encoder_primary_dac {

drivers/gpu/drm/radeon/si.c

@@ -2166,6 +2166,10 @@ static void dce6_program_watermarks(struct radeon_device *rdev,
 	WREG32(PRIORITY_A_CNT + radeon_crtc->crtc_offset, priority_a_cnt);
 	WREG32(PRIORITY_B_CNT + radeon_crtc->crtc_offset, priority_b_cnt);
 
+	/* save values for DPM */
+	radeon_crtc->line_time = line_time;
+	radeon_crtc->wm_high = latency_watermark_a;
+	radeon_crtc->wm_low = latency_watermark_b;
 }
 
 void dce6_bandwidth_update(struct radeon_device *rdev)