[PATCH v2 01/16] drm/i915/hdmi: do dual mode detect only if connected

[Jani Nikula]

For normal connector detect, there's really no point in trying dual mode
detect if the connector is disconnected. We can simplify the detect
sequence by skipping it. Since intel_hdmi_dp_dual_mode_detect() is only
called when EDID is present, we can drop the has_edid parameter.

The functional effect is speeding up disconnected connector detection
ever so slightly, and, combined with firmware EDID, also stop logging
about assuming dual mode adaptor.

It's a bit subtle, but this will also skip dual mode detect if the
connector is force connected and a) there's no EDID of any kind, normal
or override/firmware or b) there's EDID but it does not indicate
digital. These are corner cases no matter what, and arguably forcing
should not be limited by dual mode detect.

Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula at intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/display/intel_hdmi.c | 17 +++++++----------
 1 file changed, 7 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_hdmi.c b/drivers/gpu/drm/i915/display/intel_hdmi.c
index 93519fb23d9d..a332eaac86cd 100644
--- a/drivers/gpu/drm/i915/display/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/display/intel_hdmi.c
@@ -2355,7 +2355,7 @@ intel_hdmi_unset_edid(struct drm_connector *connector)
 }
 
 static void
-intel_hdmi_dp_dual_mode_detect(struct drm_connector *connector, bool has_edid)
+intel_hdmi_dp_dual_mode_detect(struct drm_connector *connector)
 {
 	struct drm_i915_private *dev_priv = to_i915(connector->dev);
 	struct intel_hdmi *hdmi = intel_attached_hdmi(to_intel_connector(connector));
@@ -2371,16 +2371,13 @@ intel_hdmi_dp_dual_mode_detect(struct drm_connector *connector, bool has_edid)
 	 * CONFIG1 pin, but no such luck on our hardware.
 	 *
 	 * The only method left to us is to check the VBT to see
-	 * if the port is a dual mode capable DP port. But let's
-	 * only do that when we sucesfully read the EDID, to avoid
-	 * confusing log messages about DP dual mode adaptors when
-	 * there's nothing connected to the port.
+	 * if the port is a dual mode capable DP port.
 	 */
 	if (type == DRM_DP_DUAL_MODE_UNKNOWN) {
 		/* An overridden EDID imply that we want this port for testing.
 		 * Make sure not to set limits for that port.
 		 */
-		if (has_edid && !connector->override_edid &&
+		if (!connector->override_edid &&
 		    intel_bios_is_port_dp_dual_mode(dev_priv, port)) {
 			drm_dbg_kms(&dev_priv->drm,
 				    "Assuming DP dual mode adaptor presence based on VBT\n");
@@ -2435,18 +2432,18 @@ intel_hdmi_set_edid(struct drm_connector *connector)
 		intel_gmbus_force_bit(i2c, false);
 	}
 
-	intel_hdmi_dp_dual_mode_detect(connector, edid != NULL);
-
-	intel_display_power_put(dev_priv, POWER_DOMAIN_GMBUS, wakeref);
-
 	to_intel_connector(connector)->detect_edid = edid;
 	if (edid && edid->input & DRM_EDID_INPUT_DIGITAL) {
 		intel_hdmi->has_audio = drm_detect_monitor_audio(edid);
 		intel_hdmi->has_hdmi_sink = drm_detect_hdmi_monitor(edid);
 
+		intel_hdmi_dp_dual_mode_detect(connector);
+
 		connected = true;
 	}
 
+	intel_display_power_put(dev_priv, POWER_DOMAIN_GMBUS, wakeref);
+
 	cec_notifier_set_phys_addr_from_edid(intel_hdmi->cec_notifier, edid);
 
 	return connected;
-- 
2.34.1