[Intel-gfx] [PATCH 11/12] drm/i915: Add lspcon hpd handler

[Shashank Sharma]

This patch adds a new hpd handler for lspcon.
As lspcon has its own way of reading EDID and detecting
the device, it wont be efficient to use the existing hpd
functions to handle the hot_plug scenarios. This new function
reads the EDID and checks the status of the sink device.

Signed-off-by: Shashank Sharma <shashank.sharma at intel.com>
---
 drivers/gpu/drm/i915/intel_lspcon.c | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_lspcon.c b/drivers/gpu/drm/i915/intel_lspcon.c
index 617fe3f..20f90e0 100644
--- a/drivers/gpu/drm/i915/intel_lspcon.c
+++ b/drivers/gpu/drm/i915/intel_lspcon.c
@@ -61,6 +61,38 @@ static struct intel_lspcon
 	return enc_to_lspcon(&intel_attached_encoder(connector)->base);
 }
 
+enum irqreturn
+lspcon_hpd_pulse(struct intel_digital_port *intel_dig_port, bool long_hpd)
+{
+	struct drm_device *dev = intel_dig_port->base.base.dev;
+	struct intel_encoder *intel_encoder = &intel_dig_port->base;
+	struct intel_connector *intel_connector;
+	bool changed = false;
+
+	mutex_lock(&dev->mode_config.mutex);
+	if (intel_encoder->hot_plug)
+		intel_encoder->hot_plug(intel_encoder);
+
+	for_each_intel_connector(dev, intel_connector) {
+		if (intel_connector->encoder == intel_encoder) {
+			struct drm_connector *connector =
+				&intel_connector->base;
+
+			DRM_DEBUG_DRIVER("Hptplug: Connector %s (pin %i).\n",
+				connector->name, intel_encoder->hpd_pin);
+			if (intel_hpd_irq_event(dev, connector))
+				changed = true;
+		}
+	}
+	mutex_unlock(&dev->mode_config.mutex);
+
+	if (changed) {
+		DRM_DEBUG_DRIVER("Sending event for change\n");
+		drm_kms_helper_hotplug_event(dev);
+	}
+	return IRQ_HANDLED;
+}
+
 enum lspcon_mode lspcon_get_current_mode(struct intel_lspcon *lspcon)
 {
 	u8 data;
@@ -396,6 +428,9 @@ int intel_lspcon_init_connector(struct intel_digital_port *intel_dig_port)
 	intel_connector->get_hw_state = intel_ddi_connector_get_hw_state;
 	i915_debugfs_connector_add(connector);
 
+	/* HPD handler */
+	intel_dig_port->hpd_pulse = lspcon_hpd_pulse;
+
 	/* init DP */
 	ret = intel_dp_init_minimum(intel_dig_port, intel_connector);
 	if (ret) {
-- 
1.9.1