[PATCH 5/5] drm/i915/ilk: Don't attempt to register eDP if LVDS was detected

[Imre Deak]

Signed-off-by: Imre Deak <imre.deak at intel.com>
---
 drivers/gpu/drm/i915/intel_dp.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 75d07d8..300af7e 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -5382,8 +5382,22 @@ static bool intel_edp_init_connector(struct intel_dp *intel_dp,
 	if (!is_edp(intel_dp))
 		return true;
 
+	/*
+	 * On ILK we may get here with LVDS already registered. Since the
+	 * driver uses the only internal power sequencer available for both
+	 * eDP and LVDS bail out early in this case to prevent interfering
+	 * with an already powered-on LVDS power sequencer.
+	 */
+	for_each_intel_encoder(dev, intel_encoder) {
+		if (intel_encoder->type == INTEL_OUTPUT_LVDS) {
+			DRM_INFO("LVDS was detected, not registering eDP\n");
+			return false;
+		}
+	}
+
 	pps_lock(intel_dp);
 	intel_edp_panel_vdd_sanitize(intel_dp);
+	intel_dp_init_panel_power_sequencer_registers(dev, intel_dp);
 	pps_unlock(intel_dp);
 
 	/* Cache DPCD and EDID for edp. */
@@ -5400,11 +5414,6 @@ static bool intel_edp_init_connector(struct intel_dp *intel_dp,
 		return false;
 	}
 
-	/* We now know it's not a ghost, init power sequence regs. */
-	pps_lock(intel_dp);
-	intel_dp_init_panel_power_sequencer_registers(dev, intel_dp);
-	pps_unlock(intel_dp);
-
 	mutex_lock(&dev->mode_config.mutex);
 	edid = drm_get_edid(connector, &intel_dp->aux.ddc);
 	if (edid) {
-- 
2.5.0