drm/imx: ldb: drop custom EDID support

Bindings for the imx-ldb never allowed specifying the EDID in DT. None
of the existing DT files use it. Drop it now in favour of using debugfs
overrides or the drm.edid_firmware support.

Reviewed-by: Philipp Zabel <[email protected]>
Tested-by: Chris Healy <[email protected]>
Tested-by: Philipp Zabel <[email protected]> # on imx6q-nitrogen6x
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Signed-off-by: Dmitry Baryshkov <[email protected]>

Author: lumag

drivers/gpu/drm/imx/ipuv3/imx-ldb.c

@@ -72,7 +72,6 @@ struct imx_ldb_channel {
 	struct device_node *child;
 	struct i2c_adapter *ddc;
 	int chno;
-	const struct drm_edid *drm_edid;
 	struct drm_display_mode mode;
 	int mode_valid;
 	u32 bus_format;
@@ -142,14 +141,17 @@ static int imx_ldb_connector_get_modes(struct drm_connector *connector)
 	if (num_modes > 0)
 		return num_modes;
 
-	if (!imx_ldb_ch->drm_edid && imx_ldb_ch->ddc) {
-		imx_ldb_ch->drm_edid = drm_edid_read_ddc(connector,
-							 imx_ldb_ch->ddc);
-		drm_edid_connector_update(connector, imx_ldb_ch->drm_edid);
-	}
+	if (imx_ldb_ch->ddc) {
+		const struct drm_edid *edid = drm_edid_read_ddc(connector,
+								imx_ldb_ch->ddc);
 
-	if (imx_ldb_ch->drm_edid)
-		num_modes = drm_edid_connector_add_modes(connector);
+		if (edid) {
+			drm_edid_connector_update(connector, edid);
+			drm_edid_free(edid);
+
+			return drm_edid_connector_add_modes(connector);
+		}
+	}
 
 	if (imx_ldb_ch->mode_valid) {
 		struct drm_display_mode *mode;
@@ -566,18 +568,10 @@ static int imx_ldb_panel_ddc(struct device *dev,
 	}
 
 	if (!channel->ddc) {
-		const void *edidp;
-		int edid_len;
-
 		/* if no DDC available, fallback to hardcoded EDID */
 		dev_dbg(dev, "no ddc available\n");
 
-		edidp = of_get_property(child, "edid", &edid_len);
-		if (edidp) {
-			channel->drm_edid = drm_edid_alloc(edidp, edid_len);
-			if (!channel->drm_edid)
-				return -ENOMEM;
-		} else if (!channel->panel) {
+		if (!channel->panel) {
 			/* fallback to display-timings node */
 			ret = of_get_drm_display_mode(child,
 						      &channel->mode,
@@ -744,7 +738,6 @@ static void imx_ldb_remove(struct platform_device *pdev)
 	for (i = 0; i < 2; i++) {
 		struct imx_ldb_channel *channel = &imx_ldb->channel[i];
 
-		drm_edid_free(channel->drm_edid);
 		i2c_put_adapter(channel->ddc);
 	}