linux-kernel - [PATCH v5 3/4] drm/i915/gen9_bc: Introduce HPD pin mappings for TGP PCH + CML combos

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Message-Id: <20210209212832.1401815-4-lyude@redhat.com>
Date:   Tue,  9 Feb 2021 16:28:30 -0500
From:   Lyude Paul <lyude@...hat.com>
To:     intel-gfx@...ts.freedesktop.org
Cc:     Matt Roper <matthew.d.roper@...el.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Ville Syrjala <ville.syrjala@...ux.intel.com>,
        Tejas Upadhyay <tejaskumarx.surendrakumar.upadhyay@...el.com>,
        Yijun Shen <Yijun.Shen@...l.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        José Roberto de Souza <jose.souza@...el.com>,
        Imre Deak <imre.deak@...el.com>,
        Uma Shankar <uma.shankar@...el.com>,
        Manasi Navare <manasi.d.navare@...el.com>,
        Lucas De Marchi <lucas.demarchi@...el.com>,
        Dave Airlie <airlied@...hat.com>,
        dri-devel@...ts.freedesktop.org (open list:DRM DRIVERS),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v5 3/4] drm/i915/gen9_bc: Introduce HPD pin mappings for TGP PCH + CML combos

Next, let's start introducing the HPD pin mappings for Intel's new gen9_bc
platform in order to make hotplugging display connectors work. Since
gen9_bc is just a TGP PCH along with a CML CPU, except with the same HPD
mappings as ICL, we simply add a skl_hpd_pin function that is shared
between gen9 and gen9_bc which handles both the traditional gen9 HPD pin
mappings and the Icelake HPD pin mappings that gen9_bc uses.

Changes since v4:
* Split this into its own commit
* Introduce skl_hpd_pin() like vsyrjala suggested and use that instead of
  sticking our HPD pin mappings in TGP code

Cc: Matt Roper <matthew.d.roper@...el.com>
Cc: Jani Nikula <jani.nikula@...ux.intel.com>
Cc: Ville Syrjala <ville.syrjala@...ux.intel.com>
[originally from Tejas's work]
Signed-off-by: Tejas Upadhyay <tejaskumarx.surendrakumar.upadhyay@...el.com>
Signed-off-by: Lyude Paul <lyude@...hat.com>
---
 drivers/gpu/drm/i915/display/intel_ddi.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index 3c4003605f93..01b171f52694 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -3954,6 +3954,14 @@ static enum hpd_pin cnl_hpd_pin(struct drm_i915_private *dev_priv,
 	return HPD_PORT_A + port - PORT_A;
 }
 
+static enum hpd_pin skl_hpd_pin(struct drm_i915_private *dev_priv, enum port port)
+{
+	if (HAS_PCH_TGP(dev_priv))
+		return icl_hpd_pin(dev_priv, port);
+
+	return HPD_PORT_A + port - PORT_A;
+}
+
 #define port_tc_name(port) ((port) - PORT_TC1 + '1')
 #define tc_port_name(tc_port) ((tc_port) - TC_PORT_1 + '1')
 
@@ -4070,6 +4078,8 @@ void intel_ddi_init(struct drm_i915_private *dev_priv, enum port port)
 		encoder->hpd_pin = icl_hpd_pin(dev_priv, port);
 	else if (IS_GEN(dev_priv, 10))
 		encoder->hpd_pin = cnl_hpd_pin(dev_priv, port);
+	else if (IS_GEN(dev_priv, 9))
+		encoder->hpd_pin = skl_hpd_pin(dev_priv, port);
 	else
 		encoder->hpd_pin = intel_hpd_pin_default(dev_priv, port);
 
-- 
2.29.2