drm/i915/bw: relocate intel_can_enable_sagv() and rename to intel_bw_can_enable_sagv()

Prefer only looking at struct intel_bw_state internals inside
intel_bw.c. To that effect, move intel_can_enable_sagv() there, and
rename to intel_bw_can_enable_sagv() to have consistent naming.

Reviewed-by: Imre Deak <[e-mail]>
Link: https://lore.kernel.org/r/dd6[e-mail]
Signed-off-by: Jani Nikula <[e-mail]>

drivers/gpu/drm/i915/display/intel_bw.c

···
 	 * for qgv peak bw in PM Demand request. So assign UINT_MAX if SAGV is
 	 * not enabled. PM Demand code will clamp the value for the register
 	 */
-	if (!intel_can_enable_sagv(display, new_bw_state)) {
+	if (!intel_bw_can_enable_sagv(display, new_bw_state)) {
 		new_bw_state->qgv_point_peakbw = U16_MAX;
 		drm_dbg_kms(display->drm, "No SAGV, use UINT_MAX as peak bw.");
 		return 0;
···
 	 * we can't enable SAGV due to the increased memory latency it may
 	 * cause.
 	 */
-	if (!intel_can_enable_sagv(display, new_bw_state)) {
+	if (!intel_bw_can_enable_sagv(display, new_bw_state)) {
 		qgv_points = icl_max_bw_qgv_point_mask(display, num_active_planes);
 		drm_dbg_kms(display->drm, "No SAGV, using single QGV point mask 0x%x\n",
 			    qgv_points);
···
 	if (!new_bw_state)
 		return 0;
 
-	if (intel_can_enable_sagv(display, new_bw_state) !=
-	    intel_can_enable_sagv(display, old_bw_state)) {
+	if (intel_bw_can_enable_sagv(display, new_bw_state) !=
+	    intel_bw_can_enable_sagv(display, old_bw_state)) {
 		ret = intel_atomic_serialize_global_state(&new_bw_state->base);
 		if (ret)
 			return ret;
···
 	new_bw_state = intel_atomic_get_new_bw_state(state);
 
 	if (new_bw_state &&
-	    intel_can_enable_sagv(display, old_bw_state) !=
-	    intel_can_enable_sagv(display, new_bw_state))
+	    intel_bw_can_enable_sagv(display, old_bw_state) !=
+	    intel_bw_can_enable_sagv(display, new_bw_state))
 		changed = true;
 
 	/*
···
 		return true;
 
 	return false;
+}
+
+bool intel_bw_can_enable_sagv(struct intel_display *display,
+			      const struct intel_bw_state *bw_state)
+{
+	if (DISPLAY_VER(display) < 11 &&
+	    bw_state->active_pipes && !is_power_of_2(bw_state->active_pipes))
+		return false;
+
+	return bw_state->pipe_sagv_reject == 0;
 }

drivers/gpu/drm/i915/display/intel_bw.h

···
 void intel_bw_crtc_disable_noatomic(struct intel_crtc *crtc);
 
 bool intel_bw_pmdemand_needs_update(struct intel_atomic_state *state);
+bool intel_bw_can_enable_sagv(struct intel_display *display,
+			      const struct intel_bw_state *bw_state);
 
 #endif /* __INTEL_BW_H__ */

drivers/gpu/drm/i915/display/skl_watermark.c

···
 	if (!new_bw_state)
 		return;
 
-	if (!intel_can_enable_sagv(display, new_bw_state))
+	if (!intel_bw_can_enable_sagv(display, new_bw_state))
 		skl_sagv_disable(display);
 }
 
···
 	if (!new_bw_state)
 		return;
 
-	if (intel_can_enable_sagv(display, new_bw_state))
+	if (intel_bw_can_enable_sagv(display, new_bw_state))
 		skl_sagv_enable(display);
 }
 
···
 		return tgl_crtc_can_enable_sagv(crtc_state);
 	else
 		return skl_crtc_can_enable_sagv(crtc_state);
-}
-
-bool intel_can_enable_sagv(struct intel_display *display,
-			   const struct intel_bw_state *bw_state)
-{
-	if (DISPLAY_VER(display) < 11 &&
-	    bw_state->active_pipes && !is_power_of_2(bw_state->active_pipes))
-		return false;
-
-	return bw_state->pipe_sagv_reject == 0;
 }
 
 static u16 skl_ddb_entry_init(struct skl_ddb_entry *entry,
···
 		 * drm_atomic_check_only() gets upset if we pull more crtcs
 		 * into the state, so we have to calculate this based on the
 		 * individual intel_crtc_can_enable_sagv() rather than
-		 * the overall intel_can_enable_sagv(). Otherwise the
+		 * the overall intel_bw_can_enable_sagv(). Otherwise the
 		 * crtcs not included in the commit would not switch to the
 		 * SAGV watermarks when we are about to enable SAGV, and that
 		 * would lead to underruns. This does mean extra power draw

drivers/gpu/drm/i915/display/skl_watermark.h

···
 
 enum plane_id;
 struct intel_atomic_state;
-struct intel_bw_state;
 struct intel_crtc;
 struct intel_crtc_state;
 struct intel_dbuf_state;
···
 void intel_sagv_pre_plane_update(struct intel_atomic_state *state);
 void intel_sagv_post_plane_update(struct intel_atomic_state *state);
 bool intel_crtc_can_enable_sagv(const struct intel_crtc_state *crtc_state);
-bool intel_can_enable_sagv(struct intel_display *display,
-			   const struct intel_bw_state *bw_state);
 bool intel_has_sagv(struct intel_display *display);
 
 u32 skl_ddb_dbuf_slice_mask(struct intel_display *display,