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Subject[PATCH 5.5 250/257] drm/i915/icl+: Dont enable DDI IO power on a TypeC port in TBT mode
Date
From: Imre Deak <imre.deak@intel.com>

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@vger.kernel.org> # v5.4+
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: José Roberto de Souza <jose.souza@intel.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@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/i915/display/intel_ddi.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index 1488822398fed..4872c357eb6da 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -2235,7 +2235,11 @@ static void intel_ddi_get_power_domains(struct intel_encoder *encoder,
return;

dig_port = enc_to_dig_port(&encoder->base);
- 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
--
2.20.1


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