[PATCH v3 3/3] drm/msm/dpu: add display port support in DPU

[Jeykumar Sankaran]

Add display port support in DPU by creating hooks
for DP encoder enumeration and encoder mode
initialization.

This change is based on the SDM845 Display port
driver changes[1].

changes in v2:
	- rebase on [2] (Sean Paul)
	- remove unwanted error checks and
	  switch cases (Jordan Crouse)
changes in v3:
	- add dp support after fixing
	  the current code base for error logging (Sean Paul)

[1] https://lwn.net/Articles/768265/
[2] https://lkml.org/lkml/2018/11/17/87

Signed-off-by: Jeykumar Sankaran <jsanka at codeaurora.org>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c |  8 ++---
 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c     | 51 +++++++++++++++++++++++++----
 2 files changed, 49 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
index 36158b7..b79fd9d 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
@@ -2029,7 +2029,7 @@ static int dpu_encoder_setup_display(struct dpu_encoder_virt *dpu_enc,
 {
 	int ret = 0;
 	int i = 0;
-	enum dpu_intf_type intf_type;
+	enum dpu_intf_type intf_type = INTF_NONE;
 	struct dpu_enc_phys_init_params phys_params;
 
 	if (!dpu_enc || !dpu_kms) {
@@ -2052,9 +2052,9 @@ static int dpu_encoder_setup_display(struct dpu_encoder_virt *dpu_enc,
 	case DRM_MODE_ENCODER_DSI:
 		intf_type = INTF_DSI;
 		break;
-	default:
-		DPU_ERROR_ENC(dpu_enc, "unsupported display interface type\n");
-		return -EINVAL;
+	case DRM_MODE_ENCODER_TMDS:
+		intf_type = INTF_DP;
+		break;
 	}
 
 	WARN_ON(disp_info->num_of_h_tiles < 1);
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
index 39c8549..ba3e75c 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
@@ -437,6 +437,32 @@ static int _dpu_kms_initialize_dsi(struct drm_device *dev,
 	return rc;
 }
 
+static int _dpu_kms_initialize_displayport(struct drm_device *dev,
+					    struct msm_drm_private *priv,
+					    struct dpu_kms *dpu_kms)
+{
+	struct drm_encoder *encoder = NULL;
+	int rc = 0;
+
+	if (!priv->dp)
+		return rc;
+
+	encoder = dpu_encoder_init(dev, DRM_MODE_ENCODER_TMDS);
+	if (IS_ERR(encoder)) {
+		DPU_ERROR("encoder init failed for dsi display\n");
+		return PTR_ERR(encoder);
+	}
+
+	rc = msm_dp_modeset_init(priv->dp, dev, encoder);
+	if (rc) {
+		DPU_ERROR("modeset_init failed for DP, rc = %d\n", rc);
+		drm_encoder_cleanup(encoder);
+		return rc;
+	}
+
+	return rc;
+}
+
 /**
  * _dpu_kms_setup_displays - create encoders, bridges and connectors
  *                           for underlying displays
@@ -457,6 +483,12 @@ static int _dpu_kms_setup_displays(struct drm_device *dev,
 		return rc;
 	}
 
+	rc = _dpu_kms_initialize_displayport(dev, priv, dpu_kms);
+	if (rc) {
+		DPU_ERROR("failed to initialize display port, rc = %d\n", rc);
+		return rc;
+	}
+
 	/**
 	 * Extend this function to initialize other
 	 * types of displays
@@ -675,13 +707,20 @@ static void _dpu_kms_set_encoder_mode(struct msm_kms *kms,
 	info.capabilities = cmd_mode ? MSM_DISPLAY_CAP_CMD_MODE :
 			MSM_DISPLAY_CAP_VID_MODE;
 
-	/* TODO: No support for DSI swap */
-	for (i = 0; i < ARRAY_SIZE(priv->dsi); i++) {
-		if (priv->dsi[i]) {
-			info.h_tile_instance[info.num_of_h_tiles] = i;
-			info.num_of_h_tiles++;
+	switch (info.intf_type) {
+	case DRM_MODE_ENCODER_DSI:
+		/* TODO: No support for DSI swap */
+		for (i = 0; i < ARRAY_SIZE(priv->dsi); i++) {
+			if (priv->dsi[i]) {
+				info.h_tile_instance[info.num_of_h_tiles] = i;
+				info.num_of_h_tiles++;
+			}
 		}
-	}
+		break;
+	case DRM_MODE_ENCODER_TMDS:
+		info.num_of_h_tiles = 1;
+		break;
+	};
 
 	rc = dpu_encoder_setup(encoder->dev, encoder, &info);
 	if (rc)
-- 
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