On 12/16/2015 7:16 PM, Daniel Vetter wrote:
On Wed, Dec 16, 2015 at 04:18:05PM +0530, Sonika Jindal wrote:
Call the encoders, call the hot_plug if it is registered.
This is required for connected boot and resume cases to generate
fake hpd resulting in reading of edid.
Removing the initial sdvo hot_plug call too so that it will be called
just once from this loop.
v2: Schedule a work function to call hot_plug. On CHT, it runs into a
deadlock if we call ->hot_plug inside hpd_init. This is because, hot_plug
calls set_edid which tries to acquire the power domain and if power
well is disabled, we enable power well and call hpd_init again.
So, schedule a work function from here to call hot_plug and run a
detect cycle.
Cc: Shashank Sharma <shashank.sharma@xxxxxxxxx>
Signed-off-by: Sonika Jindal <sonika.jindal@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_drv.h | 1 +
drivers/gpu/drm/i915/intel_hotplug.c | 26 ++++++++++++++++++++++++++
drivers/gpu/drm/i915/intel_sdvo.c | 1 -
3 files changed, 27 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index bc865e23..4f037b9 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -228,6 +228,7 @@ enum hpd_pin {
struct i915_hotplug {
struct work_struct hotplug_work;
+ struct work_struct edid_work;
struct {
unsigned long last_jiffies;
diff --git a/drivers/gpu/drm/i915/intel_hotplug.c b/drivers/gpu/drm/i915/intel_hotplug.c
index b177857..72d8fe8 100644
--- a/drivers/gpu/drm/i915/intel_hotplug.c
+++ b/drivers/gpu/drm/i915/intel_hotplug.c
@@ -442,6 +442,24 @@ void intel_hpd_irq_handler(struct drm_device *dev,
schedule_work(&dev_priv->hotplug.hotplug_work);
}
+static void i915_edid_work_func(struct work_struct *work)
+{
+ struct drm_i915_private *dev_priv =
+ container_of(work, struct drm_i915_private, hotplug.edid_work);
+ struct drm_device *dev = dev_priv->dev;
+ struct drm_mode_config *mode_config = &dev->mode_config;
+ struct intel_encoder *encoder;
+
+ mutex_lock(&mode_config->mutex);
+ list_for_each_entry(encoder, &mode_config->encoder_list,
+ base.head) {
+ if (encoder->hot_plug)
+ encoder->hot_plug(encoder);
+ }
+ mutex_unlock(&mode_config->mutex);
+ drm_helper_hpd_irq_event(dev);
+}
Why do we need a completely new hand-rolled work? My idea was to reuse the
existing hpd irq handler, but instead of just scheduling that (which won't
do anything) fake-inject a full set of hpd interrupts into it. Well, we
need to inject short-pulse ones to avoid upsetting dp mst.
-Daniel
Hmm, this suggestion came from Siva as well to just set the event_bits.
Let me try that.
Thanks,
Sonika
+
/**
* intel_hpd_init - initializes and enables hpd support
* @dev_priv: i915 device instance
@@ -482,12 +500,19 @@ void intel_hpd_init(struct drm_i915_private *dev_priv)
if (dev_priv->display.hpd_irq_setup)
dev_priv->display.hpd_irq_setup(dev);
spin_unlock_irq(&dev_priv->irq_lock);
+
+ /*
+ * Connected boot / resume scenarios can't generate new hot plug.
+ * So, probe it manually.
+ */
+ schedule_work(&dev_priv->hotplug.edid_work);
}
void intel_hpd_init_work(struct drm_i915_private *dev_priv)
{
INIT_WORK(&dev_priv->hotplug.hotplug_work, i915_hotplug_work_func);
INIT_WORK(&dev_priv->hotplug.dig_port_work, i915_digport_work_func);
+ INIT_WORK(&dev_priv->hotplug.edid_work, i915_edid_work_func);
INIT_DELAYED_WORK(&dev_priv->hotplug.reenable_work,
intel_hpd_irq_storm_reenable_work);
}
@@ -504,5 +529,6 @@ void intel_hpd_cancel_work(struct drm_i915_private *dev_priv)
cancel_work_sync(&dev_priv->hotplug.dig_port_work);
cancel_work_sync(&dev_priv->hotplug.hotplug_work);
+ cancel_work_sync(&dev_priv->hotplug.edid_work);
cancel_delayed_work_sync(&dev_priv->hotplug.reenable_work);
}
diff --git a/drivers/gpu/drm/i915/intel_sdvo.c b/drivers/gpu/drm/i915/intel_sdvo.c
index 06679f1..4238a02 100644
--- a/drivers/gpu/drm/i915/intel_sdvo.c
+++ b/drivers/gpu/drm/i915/intel_sdvo.c
@@ -2466,7 +2466,6 @@ intel_sdvo_dvi_init(struct intel_sdvo *intel_sdvo, int device)
* Ensure that they get re-enabled when an interrupt happens.
*/
intel_encoder->hot_plug = intel_sdvo_enable_hotplug;
- intel_sdvo_enable_hotplug(intel_encoder);
} else {
intel_connector->polled = DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT;
}
--
1.9.1
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