disp: msm: sde: use crtc_width instead of hdisplay for crtc/lm

The interface resolution can be different from crtc/layer-mixer WxH
when certain features like destination scaler are enabled. Use the
sde_crtc_get_width/sde_crtc_get_mixer_width functions throughout
to get the correct crtc/lm size based on different features enabled.
This will help in validating/configuring lm & plane correctly.

Change-Id: I45de5844bf7465a3389cf723479c5449a835fb0a
Signed-off-by: Veera Sundaram Sankaran <veeras@codeaurora.org>

msm/sde/sde_crtc.h

@@ -599,6 +599,25 @@ static inline int sde_crtc_get_mixer_height(struct sde_crtc *sde_crtc,
 			cstate->ds_cfg[0].lm_height : mode->vdisplay);
 }
 
+/**
+ * sde_crtc_get_width - get the correct crtc width based on the features enabled
+ */
+static inline int sde_crtc_get_width(struct sde_crtc *sde_crtc,
+	struct sde_crtc_state *cstate, struct drm_display_mode *mode)
+{
+	u32 width;
+
+	if (!sde_crtc || !cstate || !mode)
+		return 0;
+
+	if (cstate->num_ds_enabled)
+		width = cstate->ds_cfg[0].lm_width * cstate->num_ds_enabled;
+	else
+		width = mode->hdisplay;
+
+	return width;
+}
+
 /**
  * sde_crtc_frame_pending - retun the number of pending frames
  * @crtc: Pointer to drm crtc object