[PATCH 2/2] drm/i915: emit a hotplug event on resume

Jesse Barnes
2013-03-26T17:07:15Z

This will poke userspace into probing for configuration changes that may
have occurred across suspend/resume.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
---
drivers/gpu/drm/i915/i915_drv.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index bf57e1c..0cfc778 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -545,6 +545,24 @@ void intel_console_resume(struct work_struct *work)
console_unlock();
}

+static void intel_resume_hotplug(struct drm_device *dev)
+{
+ struct drm_mode_config *mode_config = &dev->mode_config;
+ struct intel_encoder *encoder;
+
+ mutex_lock(&mode_config->mutex);
+ DRM_DEBUG_KMS("running encoder hotplug functions\n");
+
+ list_for_each_entry(encoder, &mode_config->encoder_list, base.head)
+ if (encoder->hot_plug)
+ encoder->hot_plug(encoder);
+
+ mutex_unlock(&mode_config->mutex);
+
+ /* Just fire off a uevent and let userspace tell us what to do */
+ drm_helper_hpd_irq_event(dev);
+}
+
static int __i915_drm_thaw(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
@@ -580,6 +598,8 @@ static int __i915_drm_thaw(struct drm_device *dev)
* */
intel_hpd_init(dev);
dev_priv->enable_hotplug_processing = true;
+ /* Config may have changed between suspend and resume */
+ intel_resume_hotplug(dev);
}

intel_opregion_init(dev);
--
1.7.9.5