[SRU][F][PATCH 6/9] drm/i915/tc: Skip ref held check for TC legacy aux power wells

[You-Sheng Yang]

From: José Roberto de Souza <jose.souza at intel.com>

BugLink: https://bugs.launchpad.net/bugs/1868936

As part of ICL TC cold exit sequences we need to request aux power
well before lock the access to TC ports, so skiping the
intel_tc_port_ref_held() check for TC legacy ports.

Reviewed-by: Imre Deak <imre.deak at intel.com>
Tested-by: You-Sheng Yang <vicamo.yang at canonical.com>
Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200414194956.164323-5-jose.souza@intel.com
(backported from drm-tip commit 7ce40a671538c225ea8eb170830cad90b16ec211)
Signed-off-by: You-Sheng Yang <vicamo.yang at canonical.com>
---
 drivers/gpu/drm/i915/display/intel_display_power.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_display_power.c b/drivers/gpu/drm/i915/display/intel_display_power.c
index 083aefcce9c9..d8f670244422 100644
--- a/drivers/gpu/drm/i915/display/intel_display_power.c
+++ b/drivers/gpu/drm/i915/display/intel_display_power.c
@@ -571,6 +571,9 @@ static void icl_tc_port_assert_ref_held(struct drm_i915_private *dev_priv,
 	if (WARN_ON(!dig_port))
 		return;
 
+	if (INTEL_GEN(dev_priv) == 11 && dig_port->tc_legacy_port)
+		return;
+
 	WARN_ON(!intel_tc_port_ref_held(dig_port));
 }
 
-- 
2.25.1