[PATCH 5.6 209/254] drm/i915/icl+: Dont enable DDI IO power on a TypeC port in TBT mode

[Greg Kroah-Hartman]

From: Imre Deak <imre.deak@xxxxxxxxx>

commit 6e8a36c13382b7165d23928caee8d91c1b301142 upstream.

The DDI IO power well must not be enabled for a TypeC port in TBT mode,
ensure this during driver loading/system resume.

This gets rid of error messages like
[drm] *ERROR* power well DDI E TC2 IO state mismatch (refcount 1/enabled 0)

and avoids leaking the power ref when disabling the output.

Cc: <stable@xxxxxxxxxxxxxxx> # v5.4+
Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
Reviewed-by: Josà Roberto de Souza <jose.souza@xxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20200330152244.11316-1-imre.deak@xxxxxxxxx
(cherry picked from commit f77a2db27f26c3ccba0681f7e89fef083718f07f)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/gpu/drm/i915/display/intel_ddi.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -2225,7 +2225,11 @@ static void intel_ddi_get_power_domains(
 		return;
 
 	dig_port = enc_to_dig_port(encoder);
-	intel_display_power_get(dev_priv, dig_port->ddi_io_power_domain);
+
+	if (!intel_phy_is_tc(dev_priv, phy) ||
+	    dig_port->tc_mode != TC_PORT_TBT_ALT)
+		intel_display_power_get(dev_priv,
+					dig_port->ddi_io_power_domain);
 
 	/*
 	 * AUX power is only needed for (e)DP mode, and for HDMI mode on TC