drm: split edid handling in get_edid & add_edid_mode

This way driver can get_edid in output status detection
(using all workaround which are in get_edid) and then provide
this edid data in get_mode callback of output.

linux-core/drm_crtc.h

@@ -487,8 +487,9 @@ extern void drm_output_destroy(struct drm_output *output);
 extern bool drm_output_rename(struct drm_output *output, const char *name);
 extern void drm_fb_release(struct file *filp);
 
-extern int drm_add_edid_modes(struct drm_output *output,
+extern struct edid *drm_get_edid(struct drm_output *output,
-			struct i2c_adapter *adapter);
+				 struct i2c_adapter *adapter);
+extern int drm_add_edid_modes(struct drm_output *output, struct edid *edid);
 extern void drm_mode_probed_add(struct drm_output *output, struct drm_display_mode *mode);
 extern void drm_mode_remove(struct drm_output *output, struct drm_display_mode *mode);
 extern struct drm_display_mode *drm_mode_duplicate(struct drm_device *dev,

linux-core/drm_edid.c

@@ -427,41 +427,51 @@ static unsigned char *drm_ddc_read(struct i2c_adapter *adapter)
 }
 
 /**
- * drm_add_edid_modes - add modes from EDID data, if available
+ * drm_get_edid - get EDID data, if available
  * @output: output we're probing
  * @adapter: i2c adapter to use for DDC
  *
- * Poke the given output's i2c channel to grab EDID data if possible.  If we
+ * Poke the given output's i2c channel to grab EDID data if possible.
- * get any, add the specified modes to the output's mode list.
  * 
- * Return number of modes added or 0 if we couldn't find any.
+ * Return edid data or NULL if we couldn't find any.
  */
-int drm_add_edid_modes(struct drm_output *output, struct i2c_adapter *adapter)
+struct edid *drm_get_edid(struct drm_output *output,
+			  struct i2c_adapter *adapter)
 {
 	struct edid *edid;
-	int num_modes = 0;
 
 	edid = (struct edid *)drm_ddc_read(adapter);
 	if (!edid) {
 		dev_warn(&output->dev->pdev->dev, "%s: no EDID data\n",
 			 output->name);
-		goto out_err;
+		return NULL;
 	}
-
 	if (!edid_valid(edid)) {
 		dev_warn(&output->dev->pdev->dev, "%s: EDID invalid.\n",
 			 output->name);
-		goto out_err;
+		kfree(edid);
+		return NULL;
 	}
+	return edid;
+}
+EXPORT_SYMBOL(drm_get_edid);
+
+/**
+ * drm_add_edid_modes - add modes from EDID data, if available
+ * @output: output we're probing
+ * @edid: edid data
+ *
+ * Add the specified modes to the output's mode list.
+ *
+ * Return number of modes added or 0 if we couldn't find any.
+ */
+int drm_add_edid_modes(struct drm_output *output, struct edid *edid)
+{
+	int num_modes = 0;
 
 	num_modes += add_established_modes(output, edid);
 	num_modes += add_standard_modes(output, edid);
 	num_modes += add_detailed_info(output, edid);
-
 	return num_modes;
-
-out_err:
-	kfree(edid);
-	return 0;
 }
 EXPORT_SYMBOL(drm_add_edid_modes);

linux-core/intel_modes.c

@@ -50,6 +50,13 @@ bool intel_ddc_probe(struct drm_output *output)
 int intel_ddc_get_modes(struct drm_output *output)
 {
 	struct intel_output *intel_output = output->driver_private;
+	struct edid *edid;
+	int ret = 0;
 
-	return drm_add_edid_modes(output, &intel_output->ddc_bus->adapter);
+	edid = drm_get_edid(output, &intel_output->ddc_bus->adapter);
+	if (edid) {
+		ret = drm_add_edid_modes(output, edid);
+		kfree(edid);
+	}
+	return ret;
 }