drm/i915/display/vrr: Reset VRR capable property on a long hpd

With some VRR panels, user can turn VRR ON/OFF on the fly from the panel settings.
When VRR is turned OFF ,sends a long HPD to the driver clearing the Ignore MSA bit
in the DPCD. Currently the driver parses that onevery HPD but fails to reset
the corresponding VRR Capable Connector property.
Hence the userspace still sees this as VRR Capable panel which is incorrect.

Fix this by explicitly resetting the connector property.

v2: Reset vrr capable if status == connector_disconnected
v3: Use i915 and use bool vrr_capable (Jani Nikula)
v4: Move vrr_capable to after update modes call (Jani N)
Remove the redundant comment (Jan N)
v5: Fixes the regression on older platforms by resetting the VRR
only if HAS_VRR
v6: Remove the checks from driver, add in drm core before
setting VRR prop (Ville)
v7: Move VRR set/reset to set/unset_edid (Ville)

Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Fixes: 9bc34b4d ("drm/i915/display/vrr: Reset VRR capable property on a long hpd")
Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220303233222.4698-1-manasi.d.navare@intel.com
(cherry picked from commit d999ad10)
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>

drivers/gpu/drm/i915/display/intel_dp.c

@@ -4383,13 +4383,20 @@ intel_dp_update_420(struct intel_dp *intel_dp)
 static void
 intel_dp_set_edid(struct intel_dp *intel_dp)
 {
+	struct drm_i915_private *i915 = dp_to_i915(intel_dp);
 	struct intel_connector *connector = intel_dp->attached_connector;
 	struct edid *edid;
+	bool vrr_capable;
 
 	intel_dp_unset_edid(intel_dp);
 	edid = intel_dp_get_edid(intel_dp);
 	connector->detect_edid = edid;
 
+	vrr_capable = intel_vrr_is_capable(&connector->base);
+	drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] VRR capable: %s\n",
+		    connector->base.base.id, connector->base.name, str_yes_no(vrr_capable));
+	drm_connector_set_vrr_capable_property(&connector->base, vrr_capable);
+
 	intel_dp_update_dfp(intel_dp, edid);
 	intel_dp_update_420(intel_dp);
 
@@ -4422,6 +4429,9 @@ intel_dp_unset_edid(struct intel_dp *intel_dp)
 
 	intel_dp->dfp.ycbcr_444_to_420 = false;
 	connector->base.ycbcr_420_allowed = false;
+
+	drm_connector_set_vrr_capable_property(&connector->base,
+					       false);
 }
 
 static int
@@ -4572,14 +4582,9 @@ static int intel_dp_get_modes(struct drm_connector *connector)
 	int num_modes = 0;
 
 	edid = intel_connector->detect_edid;
-	if (edid) {
+	if (edid)
 		num_modes = intel_connector_update_modes(connector, edid);
 
-		if (intel_vrr_is_capable(connector))
-			drm_connector_set_vrr_capable_property(connector,
-							       true);
-	}
-
 	/* Also add fixed mode, which may or may not be present in EDID */
 	if (intel_dp_is_edp(intel_attached_dp(intel_connector)) &&
 	    intel_connector->panel.fixed_mode) {