disp: msm: sde: compute timeouts based on refresh rate

Current timeout values in sde driver for vblank, kickoff and
frame complete timeouts are fixed and can be much lower than
a vsync incase of low refresh rate display. Compute timeouts
based on refresh rate for low refresh rate displays.

Change-Id: I9dda41feb15446de7451824e185321de421ad575
Signed-off-by: Prabhanjan Kandula <pkandula@codeaurora.org>

msm/sde/sde_crtc.h

@@ -1057,4 +1057,10 @@ void _sde_crtc_clear_dim_layers_v1(struct drm_crtc_state *state);
  */
 void sde_crtc_cancel_delayed_work(struct drm_crtc *crtc);
 
+/*
+ * sde_crtc_get_src_encoder_of_clone- find source encoder of a clone mode encoder
+ * @cstate:      Pointer to DRM crtc object
+ */
+struct drm_encoder *sde_crtc_get_src_encoder_of_clone(struct drm_crtc *crtc);
+
 #endif /* _SDE_CRTC_H_ */