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

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Message-Id: <20200416131352.201075226@linuxfoundation.org>
Date:   Thu, 16 Apr 2020 15:24:58 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Imre Deak <imre.deak@...el.com>,
        José Roberto de Souza <jose.souza@...el.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>
Subject: [PATCH 5.6 209/254] drm/i915/icl+: Dont enable DDI IO power on a TypeC port in TBT mode

From: Imre Deak <imre.deak@...el.com>

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@...r.kernel.org> # v5.4+
Signed-off-by: Imre Deak <imre.deak@...el.com>
Reviewed-by: José Roberto de Souza <jose.souza@...el.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200330152244.11316-1-imre.deak@intel.com
(cherry picked from commit f77a2db27f26c3ccba0681f7e89fef083718f07f)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 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