drm/i915: move VBT based DSI presence check to intel_bios.c

Hide knowledge about VBT child devices in intel_bios.c.

v2: Move port check to intel_bios.c (Sivakumar)
Reviewed-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: NJani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1458125015-7931-4-git-send-email-jani.nikula@intel.com

drivers/gpu/drm/i915/i915_drv.h

@@ -1468,7 +1468,6 @@ struct intel_vbt_data {
 
 	/* MIPI DSI */
 	struct {
-		u16 port;
 		u16 panel_id;
 		struct mipi_config *config;
 		struct mipi_pps_data *pps;
@@ -3356,6 +3355,7 @@ bool intel_bios_is_valid_vbt(const void *buf, size_t size);
 bool intel_bios_is_tv_present(struct drm_i915_private *dev_priv);
 bool intel_bios_is_lvds_present(struct drm_i915_private *dev_priv, u8 *i2c_pin);
 bool intel_bios_is_port_edp(struct drm_i915_private *dev_priv, enum port port);
+bool intel_bios_is_dsi_present(struct drm_i915_private *dev_priv, enum port *port);
 
 /* intel_opregion.c */
 #ifdef CONFIG_ACPI

drivers/gpu/drm/i915/intel_bios.c

@@ -1237,7 +1237,6 @@ parse_device_mapping(struct drm_i915_private *dev_priv,
 		    &&p_child->common.device_type & DEVICE_TYPE_MIPI_OUTPUT) {
 			DRM_DEBUG_KMS("Found MIPI as LFP\n");
 			dev_priv->vbt.has_mipi = 1;
-			dev_priv->vbt.dsi.port = p_child->common.dvo_port;
 		}
 
 		child_dev_ptr = dev_priv->vbt.child_dev + count;
@@ -1555,3 +1554,41 @@ bool intel_bios_is_port_edp(struct drm_i915_private *dev_priv, enum port port)
 
 	return false;
 }
+
+/**
+ * intel_bios_is_dsi_present - is DSI present in VBT
+ * @dev_priv:	i915 device instance
+ * @port:	port for DSI if present
+ *
+ * Return true if DSI is present, and return the port in %port.
+ */
+bool intel_bios_is_dsi_present(struct drm_i915_private *dev_priv,
+			       enum port *port)
+{
+	union child_device_config *p_child;
+	u8 dvo_port;
+	int i;
+
+	for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
+		p_child = dev_priv->vbt.child_dev + i;
+
+		if (!(p_child->common.device_type & DEVICE_TYPE_MIPI_OUTPUT))
+			continue;
+
+		dvo_port = p_child->common.dvo_port;
+
+		switch (dvo_port) {
+		case DVO_PORT_MIPIA:
+		case DVO_PORT_MIPIC:
+			*port = dvo_port - DVO_PORT_MIPIA;
+			return true;
+		case DVO_PORT_MIPIB:
+		case DVO_PORT_MIPID:
+			DRM_DEBUG_KMS("VBT has unsupported DSI port %c\n",
+				      port_name(dvo_port - DVO_PORT_MIPIA));
+			break;
+		}
+	}
+
+	return false;
+}

drivers/gpu/drm/i915/intel_dsi.c

@@ -1149,7 +1149,7 @@ void intel_dsi_init(struct drm_device *dev)
 	DRM_DEBUG_KMS("\n");
 
 	/* There is no detection method for MIPI so rely on VBT */
-	if (!dev_priv->vbt.has_mipi)
+	if (!intel_bios_is_dsi_present(dev_priv, &port))
 		return;
 
 	if (IS_VALLEYVIEW(dev) || IS_CHERRYVIEW(dev)) {
@@ -1190,16 +1190,15 @@ void intel_dsi_init(struct drm_device *dev)
 	intel_connector->unregister = intel_connector_unregister;
 
 	/* Pipe A maps to MIPI DSI port A, pipe B maps to MIPI DSI port C */
-	if (dev_priv->vbt.dsi.port == DVO_PORT_MIPIA) {
-		intel_encoder->crtc_mask = (1 << PIPE_A);
-		intel_dsi->ports = (1 << PORT_A);
-	} else if (dev_priv->vbt.dsi.port == DVO_PORT_MIPIC) {
-		intel_encoder->crtc_mask = (1 << PIPE_B);
-		intel_dsi->ports = (1 << PORT_C);
-	}
+	if (port == PORT_A)
+		intel_encoder->crtc_mask = 1 << PIPE_A;
+	else
+		intel_encoder->crtc_mask = 1 << PIPE_B;
 
 	if (dev_priv->vbt.dsi.config->dual_link)
-		intel_dsi->ports = ((1 << PORT_A) | (1 << PORT_C));
+		intel_dsi->ports = (1 << PORT_A) | (1 << PORT_C);
+	else
+		intel_dsi->ports = 1 << port;
 
 	/* Create a DSI host (and a device) for each port. */
 	for_each_dsi_port(port, intel_dsi->ports) {