drm/i915: Make intel_crtc_active() available outside intel_pm.c

Move intel_crtc_active() to intel_display.c and make it available
elsewhere as well.

intel_edp_psr_match_conditions() already has one open coded copy,
so replace that one with a call to intel_crtc_active().

v2: Copy paste a big comment from danvet's mail explaining
    when we can ditch the extra checks
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_display.c

@@ -733,6 +733,23 @@ vlv_find_best_dpll(const intel_limit_t *limit, struct drm_crtc *crtc,
 	return true;
 }
 
+bool intel_crtc_active(struct drm_crtc *crtc)
+{
+	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
+
+	/* Be paranoid as we can arrive here with only partial
+	 * state retrieved from the hardware during setup.
+	 *
+	 * We can ditch the adjusted_mode.clock check as soon
+	 * as Haswell has gained clock readout/fastboot support.
+	 *
+	 * We can ditch the crtc->fb check as soon as we can
+	 * properly reconstruct framebuffers.
+	 */
+	return intel_crtc->active && crtc->fb &&
+		intel_crtc->config.adjusted_mode.clock;
+}
+
 enum transcoder intel_pipe_to_cpu_transcoder(struct drm_i915_private *dev_priv,
 					     enum pipe pipe)
 {

drivers/gpu/drm/i915/intel_dp.c

@@ -1628,8 +1628,7 @@ static bool intel_edp_psr_match_conditions(struct intel_dp *intel_dp)
 	}
 
 	intel_crtc = to_intel_crtc(crtc);
-	if (!intel_crtc->active || !crtc->fb ||
-	    !intel_crtc->config.adjusted_mode.clock) {
+	if (!intel_crtc_active(crtc)) {
 		DRM_DEBUG_KMS("crtc not active for PSR\n");
 		dev_priv->no_psr_reason = PSR_CRTC_NOT_ACTIVE;
 		return false;

drivers/gpu/drm/i915/intel_drv.h

@@ -808,4 +808,6 @@ extern int intel_dotclock_calculate(int link_freq,
 extern void ironlake_check_encoder_dotclock(const struct intel_crtc_config *pipe_config,
 					    int dotclock);
 
+extern bool intel_crtc_active(struct drm_crtc *crtc);
+
 #endif /* __INTEL_DRV_H__ */

drivers/gpu/drm/i915/intel_pm.c

@@ -43,17 +43,6 @@
  * i915.i915_enable_fbc parameter
  */
 
-static bool intel_crtc_active(struct drm_crtc *crtc)
-{
-	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
-
-	/* Be paranoid as we can arrive here with only partial
-	 * state retrieved from the hardware during setup.
-	 */
-	return intel_crtc->active && crtc->fb &&
-		intel_crtc->config.adjusted_mode.clock;
-}
-
 static void i8xx_disable_fbc(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;