add this node to get the current true mode.
Signed-off-by: Sandy Huang <hjc@xxxxxxxxxxxxxx>
---
drivers/gpu/drm/drm_sysfs.c | 30 ++++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)
diff --git a/drivers/gpu/drm/drm_sysfs.c b/drivers/gpu/drm/drm_sysfs.c
index 939f0032aab1..f39bcd34853b 100644
--- a/drivers/gpu/drm/drm_sysfs.c
+++ b/drivers/gpu/drm/drm_sysfs.c
@@ -19,6 +19,7 @@
#include <linux/slab.h>
#include <drm/drm_connector.h>
+#include <drm/drm_crtc.h>
#include <drm/drm_device.h>
#include <drm/drm_file.h>
#include <drm/drm_modes.h>
@@ -236,16 +237,45 @@ static ssize_t modes_show(struct device *device,
return written;
}
+static ssize_t current_mode_show(struct device *device,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct drm_connector *connector = to_drm_connector(device);
+ struct drm_display_mode *mode;
+ struct drm_crtc_state *crtc_state;
+ bool interlaced;
+ int written = 0;
+
+ if (!connector->state || !connector->state->crtc)
+ return written;
+
+ crtc_state = connector->state->crtc->state;
+ if (!crtc_state)
+ return written;
+
+ mode = &crtc_state->mode;
+
+ interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
+ written += snprintf(buf + written, PAGE_SIZE - written, "%dx%d%s%d\n",
+ mode->hdisplay, mode->vdisplay,
+ interlaced ? "i" : "p", drm_mode_vrefresh(mode));
+
+ return written;
+}
+
static DEVICE_ATTR_RW(status);
static DEVICE_ATTR_RO(enabled);
static DEVICE_ATTR_RO(dpms);
static DEVICE_ATTR_RO(modes);
+static DEVICE_ATTR_RO(current_mode);
static struct attribute *connector_dev_attrs[] = {
&dev_attr_status.attr,
&dev_attr_enabled.attr,
&dev_attr_dpms.attr,
&dev_attr_modes.attr,
+ &dev_attr_current_mode.attr,
NULL
};
--
2.17.1
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