[PATCH 3/8] drm/i915/icl: store the port type for TC ports

[Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>]

The type is detected based on the interrupt ISR bit. Once detected,
it's not supposed to be changed, so we have some sanity checks for
that.

Cc: Animesh Manna <animesh.manna@xxxxxxxxx>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
---
 drivers/gpu/drm/i915/intel_display.h |  7 +++++++
 drivers/gpu/drm/i915/intel_dp.c      | 36 +++++++++++++++++++++++++++++++++++-
 drivers/gpu/drm/i915/intel_drv.h     |  1 +
 3 files changed, 43 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_display.h b/drivers/gpu/drm/i915/intel_display.h
index ca5a10f3400d..18ed9835335c 100644
--- a/drivers/gpu/drm/i915/intel_display.h
+++ b/drivers/gpu/drm/i915/intel_display.h
@@ -137,6 +137,13 @@ enum tc_port {
 	I915_MAX_TC_PORTS
 };
 
+enum tc_port_type {
+	TC_PORT_UNKNOWN = 0,
+	TC_PORT_TYPEC,
+	TC_PORT_TBT,
+	TC_PORT_LEGACY,
+};
+
 enum dpio_channel {
 	DPIO_CH0,
 	DPIO_CH1
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index f2197dea02d0..486b879cdef7 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -4752,6 +4752,38 @@ static bool icl_combo_port_connected(struct drm_i915_private *dev_priv,
 	return I915_READ(SDEISR) & SDE_DDI_HOTPLUG_ICP(port);
 }
 
+static void icl_update_tc_port_type(struct drm_i915_private *dev_priv,
+				    struct intel_digital_port *intel_dig_port,
+				    bool is_legacy, bool is_typec, bool is_tbt)
+{
+	enum port port = intel_dig_port->base.port;
+	enum tc_port_type old_type = intel_dig_port->tc_type;
+	const char *type_str;
+
+	WARN_ON(is_legacy + is_typec + is_tbt != 1);
+
+	if (is_legacy) {
+		intel_dig_port->tc_type = TC_PORT_LEGACY;
+		type_str = "legacy";
+	} else if (is_typec) {
+		intel_dig_port->tc_type = TC_PORT_TYPEC;
+		type_str = "typec";
+	} else if (is_tbt) {
+		intel_dig_port->tc_type = TC_PORT_TBT;
+		type_str = "tbt";
+	} else {
+		return;
+	}
+
+	/* Types are not supposed to be changed at runtime. */
+	WARN_ON(old_type != TC_PORT_UNKNOWN &&
+		old_type != intel_dig_port->tc_type);
+
+	if (old_type != intel_dig_port->tc_type)
+		DRM_DEBUG_KMS("Port %c has TC type %s\n", port_name(port),
+			      type_str);
+}
+
 static bool icl_tc_port_connected(struct drm_i915_private *dev_priv,
 				  struct intel_digital_port *intel_dig_port)
 {
@@ -4772,10 +4804,12 @@ static bool icl_tc_port_connected(struct drm_i915_private *dev_priv,
 	if (cpu_isr & tbt_bit)
 		is_tbt = true;
 
-	WARN_ON(is_legacy + is_typec + is_tbt > 1);
 	if (!is_legacy && !is_typec && !is_tbt)
 		return false;
 
+	icl_update_tc_port_type(dev_priv, intel_dig_port, is_legacy, is_typec,
+				is_tbt);
+
 	return true;
 }
 
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 61e715ddd0d5..8b3c3dc76810 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1162,6 +1162,7 @@ struct intel_digital_port {
 	bool release_cl2_override;
 	uint8_t max_lanes;
 	enum intel_display_power_domain ddi_io_power_domain;
+	enum tc_port_type tc_type;
 
 	void (*write_infoframe)(struct drm_encoder *encoder,
 				const struct intel_crtc_state *crtc_state,
-- 
2.14.4

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