gpu/drm: Create sysfs to expose panel vendor infor

Create sysfs panelId, panelVer, and panelName in
/sys/class/drm/card0-DSI-1 and /sys/class/drm/card0-DSI-2 to expose
panel_name, panel_id and panel_ver for panel vendor information.

Port from: 5df4be294

Change-Id: If6733e1e64ca61c5576e9db0d7aacf62fb5e54a6
Signed-off-by: Bang Nguyen <bangnguyen@motorola.com>
Reviewed-on: https://gerrit.mot.com/1444418
SME-Granted: SME Approvals Granted
SLTApproved: Slta Waiver
Tested-by: Jira Key
Submit-Approved: Jira Key
Reviewed-on: https://gerrit.mot.com/1509785
Reviewed-by: Xiangpo Zhao <zhaoxp3@motorola.com>

drivers/gpu/drm/drm_sysfs.c

@@ -229,16 +229,64 @@ static ssize_t modes_show(struct device *device,
 	return written;
 }
 
+static ssize_t panelId_show(struct device *device,
+			struct device_attribute *attr,
+			char *buf)
+{
+	struct drm_connector *connector = to_drm_connector(device);
+
+	mutex_lock(&connector->dev->mode_config.mutex);
+	snprintf(buf, PAGE_SIZE, "0x%016llx\n",
+	connector->display_info.panel_id);
+	mutex_unlock(&connector->dev->mode_config.mutex);
+
+	return 20;
+}
+
+static ssize_t panelVer_show(struct device *device,
+			struct device_attribute *attr,
+			char *buf)
+{
+	struct drm_connector *connector = to_drm_connector(device);
+
+	mutex_lock(&connector->dev->mode_config.mutex);
+	snprintf(buf, PAGE_SIZE, "0x%016llx\n",
+	connector->display_info.panel_ver);
+	mutex_unlock(&connector->dev->mode_config.mutex);
+
+	return 20;
+}
+
+static ssize_t panelName_show(struct device *device,
+			struct device_attribute *attr,
+			char *buf)
+{
+	struct drm_connector *connector = to_drm_connector(device);
+
+	mutex_lock(&connector->dev->mode_config.mutex);
+	snprintf(buf, PAGE_SIZE, "%s\n", connector->display_info.panel_name);
+	mutex_unlock(&connector->dev->mode_config.mutex);
+
+	return sizeof(connector->display_info.panel_name);
+}
+
 static DEVICE_ATTR_RW(status);
 static DEVICE_ATTR_RO(enabled);
 static DEVICE_ATTR_RO(dpms);
 static DEVICE_ATTR_RO(modes);
+static DEVICE_ATTR_RO(panelId);
+static DEVICE_ATTR_RO(panelVer);
+static DEVICE_ATTR_RO(panelName);
+
 
 static struct attribute *connector_dev_attrs[] = {
 	&dev_attr_status.attr,
 	&dev_attr_enabled.attr,
 	&dev_attr_dpms.attr,
 	&dev_attr_modes.attr,
+	&dev_attr_panelId.attr,
+	&dev_attr_panelVer.attr,
+	&dev_attr_panelName.attr,
 	NULL
 };
 

include/drm/drm_connector.h

@@ -92,6 +92,8 @@ enum subpixel_order {
 
 };
 
+#define DRM_DISPLAY_NAME_LEN 128
+
 /**
  * struct drm_scrambling: sink's scrambling support.
  */
@@ -266,6 +268,11 @@ struct drm_display_info {
 	 */
 	unsigned int height_mm;
 
+	u64 panel_id;
+	u64 panel_ver;
+	char panel_name[DRM_DISPLAY_NAME_LEN];
+
+
 	/**
 	 * @pixel_clock: Maximum pixel clock supported by the sink, in units of
 	 * 100Hz. This mismatches the clock in &drm_display_mode (which is in

include/drm/drm_modes.h

@@ -146,6 +146,7 @@ enum drm_mode_status {
 #define CRTC_STEREO_DOUBLE_ONLY	(CRTC_STEREO_DOUBLE | CRTC_NO_DBLSCAN | CRTC_NO_VSCAN)
 
 #define DRM_MODE_FLAG_3D_MAX	DRM_MODE_FLAG_3D_SIDE_BY_SIDE_HALF
+#define DRM_MODE_DISPLAY_NAME_LEN 128
 
 #define DRM_MODE_MATCH_TIMINGS (1 << 0)
 #define DRM_MODE_MATCH_CLOCK (1 << 1)
@@ -286,6 +287,10 @@ struct drm_display_mode {
 	int vsync_end;
 	int vtotal;
 	int vscan;
+
+	u64 panel_id;
+	u64 panel_ver;
+	char panel_name[DRM_MODE_DISPLAY_NAME_LEN];
 	/**
 	 * @flags:
 	 *
@@ -331,7 +336,7 @@ struct drm_display_mode {
 	int width_mm;
 
 	/**
-	 * @height_mm:
+	 * @Height_mm:
 	 *
 	 * Addressable size of the output in mm, projectors should set this to
 	 * 0.