[SRU][E][PATCH 15/52] drm/i915: Wait for TypeC PHY complete flag to clear in safe mode

[You-Sheng Yang]

From: Imre Deak <imre.deak at intel.com>

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

The PHY status complete flag normally clears when disconnecting the PHY
in DP-alt mode (achieved by switching to safe mode), so wait for the
flag to clear.

v2:
- Use DRM_DEBUG_KMS instead of DRM_DEBUG_DRIVER. (José)

Cc: José Roberto de Souza <jose.souza at intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
Signed-off-by: Imre Deak <imre.deak at intel.com>
Reviewed-by: José Roberto de Souza <jose.souza at intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190628143635.22066-11-imre.deak@intel.com
(cherry picked from commit ddec362724f98a6725aeafda7701a40635c15909)
Signed-off-by: You-Sheng Yang <vicamo.yang at canonical.com>
---
 drivers/gpu/drm/i915/display/intel_tc.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_tc.c b/drivers/gpu/drm/i915/display/intel_tc.c
index 5e800ef5b146..c629220aae78 100644
--- a/drivers/gpu/drm/i915/display/intel_tc.c
+++ b/drivers/gpu/drm/i915/display/intel_tc.c
@@ -131,6 +131,10 @@ static void icl_tc_phy_set_safe_mode(struct intel_digital_port *dig_port,
 		val |= DP_PHY_MODE_STATUS_NOT_SAFE(tc_port);
 
 	I915_WRITE(PORT_TX_DFLEXDPCSSS, val);
+
+	if (enable && wait_for(!icl_tc_phy_status_complete(dig_port), 10))
+		DRM_DEBUG_KMS("Port %s: PHY complete clear timed out\n",
+			      dig_port->tc_port_name);
 }
 
 /*
-- 
2.25.1