drm/i915/debugfs: Add panel delays for eDP

The eDP backlight and panel enable/disable delays are quite
useful to know when measuring time consumed by suspend/resume,
and while the information is printed to the kernel log as debug
messages, having this information in debugfs makes things easier.

Signed-off-by: David Weinehall <david.weinehall@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20160823092356.7610-1-david.weinehall@linux.intel.com
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 0f6116fd91d81bd0b93b5e0b26307245d0b033d4..25af80e9d62e3e11e1823d50c1266961f4ce08a2 100644 (file)
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -5465,6 +5465,40 @@ static const struct file_operations i915_dpcd_fops = {
        .release = single_release,
 };
 
+static int i915_panel_show(struct seq_file *m, void *data)
+{
+       struct drm_connector *connector = m->private;
+       struct intel_dp *intel_dp =
+               enc_to_intel_dp(&intel_attached_encoder(connector)->base);
+
+       if (connector->status != connector_status_connected)
+               return -ENODEV;
+
+       seq_printf(m, "Panel power up delay: %d\n",
+                  intel_dp->panel_power_up_delay);
+       seq_printf(m, "Panel power down delay: %d\n",
+                  intel_dp->panel_power_down_delay);
+       seq_printf(m, "Backlight on delay: %d\n",
+                  intel_dp->backlight_on_delay);
+       seq_printf(m, "Backlight off delay: %d\n",
+                  intel_dp->backlight_off_delay);
+
+       return 0;
+}
+
+static int i915_panel_open(struct inode *inode, struct file *file)
+{
+       return single_open(file, i915_panel_show, inode->i_private);
+}
+
+static const struct file_operations i915_panel_fops = {
+       .owner = THIS_MODULE,
+       .open = i915_panel_open,
+       .read = seq_read,
+       .llseek = seq_lseek,
+       .release = single_release,
+};
+
 /**
  * i915_debugfs_connector_add - add i915 specific connector debugfs files
  * @connector: pointer to a registered drm_connector
@@ -5484,8 +5518,12 @@ int i915_debugfs_connector_add(struct drm_connector *connector)
 
        if (connector->connector_type == DRM_MODE_CONNECTOR_DisplayPort ||
            connector->connector_type == DRM_MODE_CONNECTOR_eDP)
-               debugfs_create_file("i915_dpcd", S_IRUGO, root, connector,
-                                   &i915_dpcd_fops);
+               debugfs_create_file("i915_dpcd", S_IRUGO, root,
+                                   connector, &i915_dpcd_fops);
+
+       if (connector->connector_type == DRM_MODE_CONNECTOR_eDP)
+               debugfs_create_file("i915_panel_timings", S_IRUGO, root,
+                                   connector, &i915_panel_fops);
 
        return 0;
 }