drm/msm/mdp4: Initialize DSI encoders

Create DSI encoders during modeset_init. The 2 encoders should ideally be
one command mode and one video mode DSI encoder respectively, but we don't
support command mode yet. We just create 2 of the same because the dsi
driver expects it, we end up using only the first one.
Signed-off-by: Archit Taneja <architt@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>

drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c

@@ -279,6 +279,8 @@ static int mdp4_modeset_init_intf(struct mdp4_kms *mdp4_kms,
 	struct drm_encoder *encoder;
 	struct drm_connector *connector;
 	struct device_node *panel_node;
+	struct drm_encoder *dsi_encs[MSM_DSI_ENCODER_NUM];
+	int i, dsi_id;
 	int ret;
 
 	switch (intf_type) {
@@ -333,13 +335,42 @@ static int mdp4_modeset_init_intf(struct mdp4_kms *mdp4_kms,
 
 		priv->encoders[priv->num_encoders++] = encoder;
 
+		break;
+	case DRM_MODE_ENCODER_DSI:
+		/* only DSI1 supported for now */
+		dsi_id = 0;
+
+		if (!priv->dsi[dsi_id])
+			break;
+
+		for (i = 0; i < MSM_DSI_ENCODER_NUM; i++) {
+			dsi_encs[i] = mdp4_dsi_encoder_init(dev);
+			if (IS_ERR(dsi_encs[i])) {
+				ret = PTR_ERR(dsi_encs[i]);
+				dev_err(dev->dev,
+					"failed to construct DSI encoder: %d\n",
+					ret);
+				return ret;
+			}
+
+			/* TODO: Add DMA_S later? */
+			dsi_encs[i]->possible_crtcs = 1 << DMA_P;
+			priv->encoders[priv->num_encoders++] = dsi_encs[i];
+		}
+
+		ret = msm_dsi_modeset_init(priv->dsi[dsi_id], dev, dsi_encs);
+		if (ret) {
+			dev_err(dev->dev, "failed to initialize DSI: %d\n",
+				ret);
+			return ret;
+		}
+
 		break;
 	default:
 		dev_err(dev->dev, "Invalid or unsupported interface\n");
 		return -EINVAL;
 	}
 
-
 	return 0;
 }
 
@@ -364,6 +395,7 @@ static int modeset_init(struct mdp4_kms *mdp4_kms)
 	};
 	static const int mdp4_intfs[] = {
 		DRM_MODE_ENCODER_LVDS,
+		DRM_MODE_ENCODER_DSI,
 		DRM_MODE_ENCODER_TMDS,
 	};
 
@@ -404,6 +436,9 @@ static int modeset_init(struct mdp4_kms *mdp4_kms)
 	 * we currently set up two relatively fixed paths:
 	 *
 	 * LCDC/LVDS path: RGB1 -> DMA_P -> LCDC -> LVDS
+	 *			or
+	 * DSI path: RGB1 -> DMA_P -> DSI1 -> DSI Panel
+	 *
 	 * DTV/HDMI path: RGB2 -> DMA_E -> DTV -> HDMI
 	 */