[PATCH 1/7][SRU][OEM-B][B] drm/i915: Convert intel_hpd_irq_event() into an encoder hotplug hook

[You-Sheng Yang]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

BugLink: http://bugs.launchpad.net/bugs/1835001

Allow encoders to customize their hotplug processing by moving the
intel_hpd_irq_event() code into an encoder hotplug vfunc. Currently
only SDVO needs this to re-enable hotplug signalling in the SDVO
chip. We'll use this same hook for DP/HDMI link management later.

Reviewed-by: Jani Nikula <jani.nikula at intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
Reviewed-by: Lyude Paul <lyude at redhat.com>
Signed-off-by: Lyude Paul <lyude at redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180117192149.17760-1-ville.syrjala@linux.intel.com
(cherry picked from commit 1b2cb026dc8b6f5cc4043031896a27745ad6f898)
Signed-off-by: You-Sheng Yang <vicamo.yang at canonical.com>
---
 drivers/gpu/drm/i915/intel_sdvo.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_sdvo.c b/drivers/gpu/drm/i915/intel_sdvo.c
index 7437944b388f..1b9e9ac2fac9 100644
--- a/drivers/gpu/drm/i915/intel_sdvo.c
+++ b/drivers/gpu/drm/i915/intel_sdvo.c
@@ -1690,7 +1690,15 @@ static void intel_sdvo_enable_hotplug(struct intel_encoder *encoder)
 	struct intel_sdvo *intel_sdvo = to_sdvo(encoder);
 
 	intel_sdvo_write_cmd(intel_sdvo, SDVO_CMD_SET_ACTIVE_HOT_PLUG,
-			&intel_sdvo->hotplug_active, 2);
+			     &intel_sdvo->hotplug_active, 2);
+}
+
+static bool intel_sdvo_hotplug(struct intel_encoder *encoder,
+			       struct intel_connector *connector)
+{
+	intel_sdvo_enable_hotplug(encoder);
+
+	return intel_encoder_hotplug(encoder, connector);
 }
 
 static bool
@@ -2494,7 +2502,7 @@ intel_sdvo_dvi_init(struct intel_sdvo *intel_sdvo, int device)
 		/* Some SDVO devices have one-shot hotplug interrupts.
 		 * Ensure that they get re-enabled when an interrupt happens.
 		 */
-		intel_encoder->hot_plug = intel_sdvo_enable_hotplug;
+		intel_encoder->hotplug = intel_sdvo_hotplug;
 		intel_sdvo_enable_hotplug(intel_encoder);
 	} else {
 		intel_connector->polled = DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT;
-- 
2.20.1