From 9856308c94ca821fdc6f3440e4d4de069b09677c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= <ville.syrjala@linux.intel.com>
Date: Fri, 30 Jun 2023 18:58:42 +0300
Subject: [PATCH] drm/i915: Only populate aux_ch if really needed
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Mixing VBT based AUX CH with platform defaults seems like
a recipe for conflicts. Let's only populate AUX CH if we
absolutely need it, that is only if we are dealing with
a DP output or a TC port (which need it due to some power
well shenanigans).
TODO: double check that real VBTs do in fact populate
the AUX CH for HDMI TC legacy ports...
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230630155846.29931-3-ville.syrjala@linux.intel.com
---
drivers/gpu/drm/i915/display/g4x_hdmi.c | 1 -
drivers/gpu/drm/i915/display/intel_ddi.c | 12 +++++++++++-
2 files changed, 11 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/g4x_hdmi.c b/drivers/gpu/drm/i915/display/g4x_hdmi.c
index c1fd13bdc9d2e..634b14116d9dd 100644
--- a/drivers/gpu/drm/i915/display/g4x_hdmi.c
+++ b/drivers/gpu/drm/i915/display/g4x_hdmi.c
@@ -775,6 +775,5 @@ void g4x_hdmi_init(struct drm_i915_private *dev_priv,
intel_infoframe_init(dig_port);
- dig_port->aux_ch = intel_dp_aux_ch(intel_encoder);
intel_hdmi_init_connector(dig_port, intel_connector);
}
diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index 6cb24a472a9bb..662b5ceef3c83 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -4676,6 +4676,14 @@ static bool port_strap_detected(struct drm_i915_private *i915, enum port port)
}
}
+static bool need_aux_ch(struct intel_encoder *encoder, bool init_dp)
+{
+ struct drm_i915_private *i915 = to_i915(encoder->base.dev);
+ enum phy phy = intel_port_to_phy(i915, encoder->port);
+
+ return init_dp || intel_phy_is_tc(i915, phy);
+}
+
void intel_ddi_init(struct drm_i915_private *dev_priv, enum port port)
{
struct intel_digital_port *dig_port;
@@ -4929,7 +4937,9 @@ void intel_ddi_init(struct drm_i915_private *dev_priv, enum port port)
dig_port->dp.output_reg = INVALID_MMIO_REG;
dig_port->max_lanes = intel_ddi_max_lanes(dig_port);
- dig_port->aux_ch = intel_dp_aux_ch(encoder);
+
+ if (need_aux_ch(encoder, init_dp))
+ dig_port->aux_ch = intel_dp_aux_ch(encoder);
if (intel_phy_is_tc(dev_priv, phy)) {
bool is_legacy =
--
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