From 2a041c97c3bceab8b7f133658c22659e4a81bd75 Mon Sep 17 00:00:00 2001 From: Imre Deak Date: Fri, 14 Dec 2018 20:27:03 +0200 Subject: [PATCH] drm/i915/icl: Add fallback detection method for TypeC legacy ports MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Add a fallback detection method for TypeC legacy ports in case the VBT port information used to detect normally such ports is incorrect. For the fallback method we use the TypeC legacy mode specific HPD interrupt flag which should only be raised for a legacy port. WARN if the VBT port info is incorrect. In a case where we'd detect the port in a contradicting way both as a legacy and also as a USB DP and/or TBT alternate port treat the port as legacy (by also emitting a WARN from icl_update_tc_port_type). v2: - Repurpose the detection as a fallback method instead of using it only for the DP legacy case. By now we should normally use VBT to detect DP legacy ports as well. Suggested-by: Ville Syrjälä Cc: Paulo Zanoni Cc: Ville Syrjälä Cc: José Roberto de Souza Cc: Rodrigo Vivi Signed-off-by: Imre Deak Reviewed-by: Rodrigo Vivi (v1) Reviewed-by: Mika Kahola Link: https://patchwork.freedesktop.org/patch/msgid/20181214182703.18865-5-imre.deak@intel.com --- drivers/gpu/drm/i915/intel_dp.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index a9f22a3..5b601b75 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -5223,8 +5223,14 @@ static bool icl_tc_port_connected(struct drm_i915_private *dev_priv, bool is_legacy, is_typec, is_tbt; u32 dpsp; - is_legacy = intel_dig_port->tc_legacy_port || - I915_READ(SDEISR) & SDE_TC_HOTPLUG_ICP(tc_port); + /* + * WARN if we got a legacy port HPD, but VBT didn't mark the port as + * legacy. Treat the port as legacy from now on. + */ + if (WARN_ON(!intel_dig_port->tc_legacy_port && + I915_READ(SDEISR) & SDE_TC_HOTPLUG_ICP(tc_port))) + intel_dig_port->tc_legacy_port = true; + is_legacy = intel_dig_port->tc_legacy_port; /* * The spec says we shouldn't be using the ISR bits for detecting -- 2.7.4