drm/omap: hdmi: Allocate EDID in the .read_edid() operation

Bring the omapdss-specific .read_edid() operation in sync with the
drm_bridge .get_edid() operation to ease code reuse.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Tested-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200226112514.12455-29-laurent.pinchart@ideasonboard.com

drivers/gpu/drm/omapdrm/dss/hdmi4.c

@@ -405,31 +405,45 @@ static void hdmi_disconnect(struct omap_dss_device *src,
 	omapdss_device_disconnect(dst, dst->next);
 }
 
-static int hdmi_read_edid(struct omap_dss_device *dssdev,
-		u8 *edid, int len)
+#define MAX_EDID	512
+
+static struct edid *hdmi_read_edid(struct omap_dss_device *dssdev)
 {
 	struct omap_hdmi *hdmi = dssdev_to_hdmi(dssdev);
 	bool need_enable;
+	u8 *edid;
 	int r;
 
+	edid = kzalloc(MAX_EDID, GFP_KERNEL);
+	if (!edid)
+		return NULL;
+
 	need_enable = hdmi->core_enabled == false;
 
 	if (need_enable) {
 		r = hdmi4_core_enable(&hdmi->core);
-		if (r)
-			return r;
+		if (r) {
+			kfree(edid);
+			return NULL;
+		}
+	}
+
+	r = read_edid(hdmi, edid, MAX_EDID);
+	if (r < 0) {
+		kfree(edid);
+		edid = NULL;
+	} else {
+		unsigned int cec_addr;
+
+		cec_addr = r >= 256 ? cec_get_edid_phys_addr(edid, r, NULL)
+			 : CEC_PHYS_ADDR_INVALID;
+		hdmi4_cec_set_phys_addr(&hdmi->core, cec_addr);
 	}
 
-	r = read_edid(hdmi, edid, len);
-	if (r >= 256)
-		hdmi4_cec_set_phys_addr(&hdmi->core,
-					cec_get_edid_phys_addr(edid, r, NULL));
-	else
-		hdmi4_cec_set_phys_addr(&hdmi->core, CEC_PHYS_ADDR_INVALID);
 	if (need_enable)
 		hdmi4_core_disable(&hdmi->core);
 
-	return r;
+	return (struct edid *)edid;
 }
 
 static void hdmi_lost_hotplug(struct omap_dss_device *dssdev)

drivers/gpu/drm/omapdrm/dss/hdmi5.c

@@ -410,27 +410,39 @@ static void hdmi_disconnect(struct omap_dss_device *src,
 	omapdss_device_disconnect(dst, dst->next);
 }
 
-static int hdmi_read_edid(struct omap_dss_device *dssdev,
-		u8 *edid, int len)
+#define MAX_EDID	512
+
+static struct edid *hdmi_read_edid(struct omap_dss_device *dssdev)
 {
 	struct omap_hdmi *hdmi = dssdev_to_hdmi(dssdev);
 	bool need_enable;
+	u8 *edid;
 	int r;
 
+	edid = kzalloc(MAX_EDID, GFP_KERNEL);
+	if (!edid)
+		return NULL;
+
 	need_enable = hdmi->core_enabled == false;
 
 	if (need_enable) {
 		r = hdmi_core_enable(hdmi);
-		if (r)
-			return r;
+		if (r) {
+			kfree(edid);
+			return NULL;
+		}
 	}
 
-	r = read_edid(hdmi, edid, len);
+	r = read_edid(hdmi, edid, MAX_EDID);
+	if (r < 0) {
+		kfree(edid);
+		edid = NULL;
+	}
 
 	if (need_enable)
 		hdmi_core_disable(hdmi);
 
-	return r;
+	return (struct edid *)edid;
 }
 
 static int hdmi_set_infoframe(struct omap_dss_device *dssdev,

drivers/gpu/drm/omapdrm/dss/omapdss.h

@@ -367,7 +367,7 @@ struct omap_dss_device_ops {
 				void *cb_data);
 	void (*unregister_hpd_cb)(struct omap_dss_device *dssdev);
 
-	int (*read_edid)(struct omap_dss_device *dssdev, u8 *buf, int len);
+	struct edid *(*read_edid)(struct omap_dss_device *dssdev);
 
 	int (*get_modes)(struct omap_dss_device *dssdev,
 			 struct drm_connector *connector);

drivers/gpu/drm/omapdrm/omap_connector.c

@@ -153,25 +153,19 @@ static void omap_connector_destroy(struct drm_connector *connector)
 	kfree(omap_connector);
 }
 
-#define MAX_EDID  512
-
 static int omap_connector_get_modes_edid(struct drm_connector *connector,
 					 struct omap_dss_device *dssdev)
 {
 	enum drm_connector_status status;
-	void *edid;
+	struct edid *edid;
 	int n;
 
 	status = omap_connector_detect(connector, false);
 	if (status != connector_status_connected)
 		goto no_edid;
 
-	edid = kzalloc(MAX_EDID, GFP_KERNEL);
-	if (!edid)
-		goto no_edid;
-
-	if (dssdev->ops->read_edid(dssdev, edid, MAX_EDID) <= 0 ||
-	    !drm_edid_is_valid(edid)) {
+	edid = dssdev->ops->read_edid(dssdev);
+	if (!edid || !drm_edid_is_valid(edid)) {
 		kfree(edid);
 		goto no_edid;
 	}