drm/i915: Change the watermark latency type to uint16_t

The latency values fit in uint16_t, so let's save a few bytes.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 1a80787..faa4ef6 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -2353,7 +2353,7 @@
 
 static void hsw_compute_wm_parameters(struct drm_device *dev,
 				      struct hsw_pipe_wm_parameters *params,
-				      uint32_t *wm,
+				      uint16_t *wm,
 				      struct hsw_wm_maximums *lp_max_1_2,
 				      struct hsw_wm_maximums *lp_max_5_6)
 {
@@ -2426,7 +2426,7 @@
 
 static void hsw_compute_wm_results(struct drm_device *dev,
 				   struct hsw_pipe_wm_parameters *params,
-				   uint32_t *wm,
+				   uint16_t *wm,
 				   struct hsw_wm_maximums *lp_maximums,
 				   struct hsw_wm_values *results)
 {
@@ -2608,7 +2608,7 @@
 	struct hsw_wm_maximums lp_max_1_2, lp_max_5_6;
 	struct hsw_pipe_wm_parameters params[3];
 	struct hsw_wm_values results_1_2, results_5_6, *best_results;
-	uint32_t wm[5];
+	uint16_t wm[5];
 	enum hsw_data_buf_partitioning partitioning;
 
 	hsw_compute_wm_parameters(dev, params, wm, &lp_max_1_2, &lp_max_5_6);