drm/i915: Use u8 consistently for active_planes bitmask

Be consistent in that active_planes bitmask fits in a u8.
Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210514125751.17075-4-ville.syrjala@linux.intel.comReviewed-by: NStanislav Lisovskiy <stanislav.lisovskiy@intel.com>

drivers/gpu/drm/i915/intel_pm.c

@@ -1708,7 +1708,7 @@ static int vlv_compute_fifo(struct intel_crtc_state *crtc_state)
 	const struct g4x_pipe_wm *raw =
 		&crtc_state->wm.vlv.raw[VLV_WM_LEVEL_PM2];
 	struct vlv_fifo_state *fifo_state = &crtc_state->wm.vlv.fifo_state;
-	unsigned int active_planes = crtc_state->active_planes & ~BIT(PLANE_CURSOR);
+	u8 active_planes = crtc_state->active_planes & ~BIT(PLANE_CURSOR);
 	int num_active_planes = hweight8(active_planes);
 	const int fifo_size = 511;
 	int fifo_extra, fifo_left = fifo_size;
@@ -1900,8 +1900,8 @@ static int vlv_compute_pipe_wm(struct intel_atomic_state *state,
 	struct vlv_wm_state *wm_state = &crtc_state->wm.vlv.optimal;
 	const struct vlv_fifo_state *fifo_state =
 		&crtc_state->wm.vlv.fifo_state;
-	int num_active_planes = hweight8(crtc_state->active_planes &
-					 ~BIT(PLANE_CURSOR));
+	u8 active_planes = crtc_state->active_planes & ~BIT(PLANE_CURSOR);
+	int num_active_planes = hweight8(active_planes);
 	bool needs_modeset = drm_atomic_crtc_needs_modeset(&crtc_state->uapi);
 	const struct intel_plane_state *old_plane_state;
 	const struct intel_plane_state *new_plane_state;