[PATCH 49/72] imx-drm: imx-ldb: Add DDC support

[Steve Longerbeam]

Add support for reading EDID over Display Data Channel. If no DDC
adapter is available, falls back to hardcoded EDID or display-timings
node as before.

Signed-off-by: Steve Longerbeam <steve_longerbeam at mentor.com>
---
 drivers/staging/imx-drm/imx-ldb.c |   39 +++++++++++++++++++++++++++++--------
 1 file changed, 31 insertions(+), 8 deletions(-)

diff --git a/drivers/staging/imx-drm/imx-ldb.c b/drivers/staging/imx-drm/imx-ldb.c
index 1eb632f..6c16cf2 100644
--- a/drivers/staging/imx-drm/imx-ldb.c
+++ b/drivers/staging/imx-drm/imx-ldb.c
@@ -61,6 +61,7 @@ struct imx_ldb_channel {
 	struct drm_connector connector;
 	struct drm_encoder encoder;
 	struct device_node *child;
+	struct i2c_adapter *ddc;
 	int chno;
 	void *edid;
 	int edid_len;
@@ -103,6 +104,9 @@ static int imx_ldb_connector_get_modes(struct drm_connector *connector)
 
 	imx_ldb_entry_dbg(imx_ldb_ch);
 
+	if (!imx_ldb_ch->edid && imx_ldb_ch->ddc)
+		imx_ldb_ch->edid = drm_get_edid(connector, imx_ldb_ch->ddc);
+
 	if (imx_ldb_ch->edid) {
 		drm_mode_connector_update_edid_property(connector,
 							imx_ldb_ch->edid);
@@ -529,6 +533,7 @@ static int imx_ldb_bind(struct device *dev, struct device *master, void *data)
 
 	for_each_child_of_node(np, child) {
 		struct imx_ldb_channel *channel;
+		struct device_node *ddc_node;
 
 		ret = of_property_read_u32(child, "reg", &i);
 		if (ret || i < 0 || i > 1)
@@ -547,14 +552,30 @@ static int imx_ldb_bind(struct device *dev, struct device *master, void *data)
 		channel->chno = i;
 		channel->child = child;
 
-		edidp = of_get_property(child, "edid", &channel->edid_len);
-		if (edidp) {
-			channel->edid = kmemdup(edidp, channel->edid_len,
-						GFP_KERNEL);
-		} else {
-			ret = of_get_drm_display_mode(child, &channel->mode, 0);
-			if (!ret)
-				channel->mode_valid = 1;
+		ddc_node = of_parse_phandle(child, "ddc-i2c-bus", 0);
+		if (ddc_node) {
+			channel->ddc = of_find_i2c_adapter_by_node(ddc_node);
+			of_node_put(ddc_node);
+		}
+
+		if (!channel->ddc) {
+			/* if no DDC available, fallback to hardcoded EDID */
+			dev_dbg(dev, "no ddc available\n");
+
+			edidp = of_get_property(child, "edid",
+						&channel->edid_len);
+			if (edidp) {
+				channel->edid = kmemdup(edidp,
+							channel->edid_len,
+							GFP_KERNEL);
+			} else {
+				/* fallback to display-timings node */
+				ret = of_get_drm_display_mode(child,
+							      &channel->mode,
+							      0);
+				if (!ret)
+					channel->mode_valid = 1;
+			}
 		}
 
 		ret = of_property_read_u32(child, "fsl,data-width", &datawidth);
@@ -616,6 +637,8 @@ static void imx_ldb_unbind(struct device *dev, struct device *master,
 
 		channel->connector.funcs->destroy(&channel->connector);
 		channel->encoder.funcs->destroy(&channel->encoder);
+
+		i2c_put_adapter(channel->ddc);
 	}
 }
 
-- 
1.7.9.5