[PATCH v2 03/23] drm/i915: Move the TypeC port handling code to a separate file

Imre Deak
2019-06-20T14:06:10Z

Move the TypeC port handling functions to a new file for clarity.

While at it:
- s/icl_tc_port_connected()/intel_tc_port_connected()/
icl_tc_phy_disconnect(), will be unexported later.

- s/intel_dp_get_fia_supported_lane_count()/
intel_tc_port_fia_max_lane_count()/
It's used for HDMI legacy mode too.

- Simplify function interfaces by passing only dig_port to them.

No functional changes.

v2:
- Fix checkpatch issues: +1/-1 empty lines in intel_tc.c and add
missing SPDX to intel_tc.h. (Jani)

Cc: Animesh Manna <animesh.manna@intel.com>
Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Cc: José Roberto de Souza <jose.souza@intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: José Roberto de Souza <jose.souza@intel.com>
---
drivers/gpu/drm/i915/Makefile | 3 +-
drivers/gpu/drm/i915/display/intel_ddi.c | 6 +-
drivers/gpu/drm/i915/display/intel_dp.c | 227 +---------------------
drivers/gpu/drm/i915/display/intel_dp.h | 2 -
drivers/gpu/drm/i915/display/intel_tc.c | 230 +++++++++++++++++++++++
drivers/gpu/drm/i915/display/intel_tc.h | 18 ++
6 files changed, 256 insertions(+), 230 deletions(-)
create mode 100644 drivers/gpu/drm/i915/display/intel_tc.c
create mode 100644 drivers/gpu/drm/i915/display/intel_tc.h

diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index 91355c2ea8a5..c48747d71810 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -174,7 +174,8 @@ i915-y += \
display/intel_overlay.o \
display/intel_psr.o \
display/intel_quirks.o \
- display/intel_sprite.o
+ display/intel_sprite.o \
+ display/intel_tc.o
i915-$(CONFIG_ACPI) += \
display/intel_acpi.o \
display/intel_opregion.o
diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index 7925a176f900..d06f121281ef 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -45,6 +45,7 @@
#include "intel_lspcon.h"
#include "intel_panel.h"
#include "intel_psr.h"
+#include "intel_tc.h"
#include "intel_vdsc.h"

struct ddi_buf_trans {
@@ -3917,7 +3918,6 @@ static int intel_ddi_compute_config(struct intel_encoder *encoder,
static void intel_ddi_encoder_suspend(struct intel_encoder *encoder)
{
struct intel_digital_port *dig_port = enc_to_dig_port(&encoder->base);
- struct drm_i915_private *i915 = to_i915(encoder->base.dev);

intel_dp_encoder_suspend(encoder);

@@ -3927,7 +3927,7 @@ static void intel_ddi_encoder_suspend(struct intel_encoder *encoder)
* even if the sink has disappeared while being suspended.
*/
if (dig_port->tc_legacy_port)
- icl_tc_phy_disconnect(i915, dig_port);
+ icl_tc_phy_disconnect(dig_port);
}

static void intel_ddi_encoder_reset(struct drm_encoder *drm_encoder)
@@ -3949,7 +3949,7 @@ static void intel_ddi_encoder_destroy(struct drm_encoder *encoder)
intel_dp_encoder_flush_work(encoder);

if (intel_port_is_tc(i915, dig_port->base.port))
- icl_tc_phy_disconnect(i915, dig_port);
+ icl_tc_phy_disconnect(dig_port);

drm_encoder_cleanup(encoder);
kfree(dig_port);
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 4336df46fe78..348c70b75403 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -62,6 +62,7 @@
#include "intel_panel.h"
#include "intel_psr.h"
#include "intel_sideband.h"
+#include "intel_tc.h"
#include "intel_vdsc.h"

#define DP_DPRX_ESI_LEN 14
@@ -211,46 +212,13 @@ static int intel_dp_max_common_rate(struct intel_dp *intel_dp)
return intel_dp->common_rates[intel_dp->num_common_rates - 1];
}

-static int intel_dp_get_fia_supported_lane_count(struct intel_dp *intel_dp)
-{
- struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
- struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
- enum tc_port tc_port = intel_port_to_tc(dev_priv, dig_port->base.port);
- intel_wakeref_t wakeref;
- u32 lane_info;
-
- if (tc_port == PORT_TC_NONE || dig_port->tc_type != TC_PORT_TYPEC)
- return 4;
-
- lane_info = 0;
- with_intel_display_power(dev_priv, POWER_DOMAIN_DISPLAY_CORE, wakeref)
- lane_info = (I915_READ(PORT_TX_DFLEXDPSP) &
- DP_LANE_ASSIGNMENT_MASK(tc_port)) >>
- DP_LANE_ASSIGNMENT_SHIFT(tc_port);
-
- switch (lane_info) {
- default:
- MISSING_CASE(lane_info);
- case 1:
- case 2:
- case 4:
- case 8:
- return 1;
- case 3:
- case 12:
- return 2;
- case 15:
- return 4;
- }
-}
-
/* Theoretical max between source and sink */
static int intel_dp_max_common_lane_count(struct intel_dp *intel_dp)
{
struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
int source_max = intel_dig_port->max_lanes;
int sink_max = drm_dp_max_lane_count(intel_dp->dpcd);
- int fia_max = intel_dp_get_fia_supported_lane_count(intel_dp);
+ int fia_max = intel_tc_port_fia_max_lane_count(intel_dig_port);

return min3(source_max, sink_max, fia_max);
}
@@ -5232,195 +5200,6 @@ static bool icl_combo_port_connected(struct drm_i915_private *dev_priv,
return I915_READ(SDEISR) & SDE_DDI_HOTPLUG_ICP(port);
}

-static const char *tc_type_name(enum tc_port_type type)
-{
- static const char * const names[] = {
- [TC_PORT_UNKNOWN] = "unknown",
- [TC_PORT_LEGACY] = "legacy",
- [TC_PORT_TYPEC] = "typec",
- [TC_PORT_TBT] = "tbt",
- };
-
- if (WARN_ON(type >= ARRAY_SIZE(names)))
- type = TC_PORT_UNKNOWN;
-
- return names[type];
-}
-
-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;
-
- WARN_ON(is_legacy + is_typec + is_tbt != 1);
-
- if (is_legacy)
- intel_dig_port->tc_type = TC_PORT_LEGACY;
- else if (is_typec)
- intel_dig_port->tc_type = TC_PORT_TYPEC;
- else if (is_tbt)
- intel_dig_port->tc_type = TC_PORT_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),
- tc_type_name(intel_dig_port->tc_type));
-}
-
-/*
- * This function implements the first part of the Connect Flow described by our
- * specification, Gen11 TypeC Programming chapter. The rest of the flow (reading
- * lanes, EDID, etc) is done as needed in the typical places.
- *
- * Unlike the other ports, type-C ports are not available to use as soon as we
- * get a hotplug. The type-C PHYs can be shared between multiple controllers:
- * display, USB, etc. As a result, handshaking through FIA is required around
- * connect and disconnect to cleanly transfer ownership with the controller and
- * set the type-C power state.
- *
- * We could opt to only do the connect flow when we actually try to use the AUX
- * channels or do a modeset, then immediately run the disconnect flow after
- * usage, but there are some implications on this for a dynamic environment:
- * things may go away or change behind our backs. So for now our driver is
- * always trying to acquire ownership of the controller as soon as it gets an
- * interrupt (or polls state and sees a port is connected) and only gives it
- * back when it sees a disconnect. Implementation of a more fine-grained model
- * will require a lot of coordination with user space and thorough testing for
- * the extra possible cases.
- */
-static bool icl_tc_phy_connect(struct drm_i915_private *dev_priv,
- struct intel_digital_port *dig_port)
-{
- enum tc_port tc_port = intel_port_to_tc(dev_priv, dig_port->base.port);
- u32 val;
-
- if (dig_port->tc_type != TC_PORT_LEGACY &&
- dig_port->tc_type != TC_PORT_TYPEC)
- return true;
-
- val = I915_READ(PORT_TX_DFLEXDPPMS);
- if (!(val & DP_PHY_MODE_STATUS_COMPLETED(tc_port))) {
- DRM_DEBUG_KMS("DP PHY for TC port %d not ready\n", tc_port);
- WARN_ON(dig_port->tc_legacy_port);
- return false;
- }
-
- /*
- * This function may be called many times in a row without an HPD event
- * in between, so try to avoid the write when we can.
- */
- val = I915_READ(PORT_TX_DFLEXDPCSSS);
- if (!(val & DP_PHY_MODE_STATUS_NOT_SAFE(tc_port))) {
- val |= DP_PHY_MODE_STATUS_NOT_SAFE(tc_port);
- I915_WRITE(PORT_TX_DFLEXDPCSSS, val);
- }
-
- /*
- * Now we have to re-check the live state, in case the port recently
- * became disconnected. Not necessary for legacy mode.
- */
- if (dig_port->tc_type == TC_PORT_TYPEC &&
- !(I915_READ(PORT_TX_DFLEXDPSP) & TC_LIVE_STATE_TC(tc_port))) {
- DRM_DEBUG_KMS("TC PHY %d sudden disconnect.\n", tc_port);
- icl_tc_phy_disconnect(dev_priv, dig_port);
- return false;
- }
-
- return true;
-}
-
-/*
- * See the comment at the connect function. This implements the Disconnect
- * Flow.
- */
-void icl_tc_phy_disconnect(struct drm_i915_private *dev_priv,
- struct intel_digital_port *dig_port)
-{
- enum tc_port tc_port = intel_port_to_tc(dev_priv, dig_port->base.port);
-
- if (dig_port->tc_type == TC_PORT_UNKNOWN)
- return;
-
- /*
- * TBT disconnection flow is read the live status, what was done in
- * caller.
- */
- if (dig_port->tc_type == TC_PORT_TYPEC ||
- dig_port->tc_type == TC_PORT_LEGACY) {
- u32 val;
-
- val = I915_READ(PORT_TX_DFLEXDPCSSS);
- val &= ~DP_PHY_MODE_STATUS_NOT_SAFE(tc_port);
- I915_WRITE(PORT_TX_DFLEXDPCSSS, val);
- }
-
- DRM_DEBUG_KMS("Port %c TC type %s disconnected\n",
- port_name(dig_port->base.port),
- tc_type_name(dig_port->tc_type));
-
- dig_port->tc_type = TC_PORT_UNKNOWN;
-}
-
-/*
- * The type-C ports are different because even when they are connected, they may
- * not be available/usable by the graphics driver: see the comment on
- * icl_tc_phy_connect(). So in our driver instead of adding the additional
- * concept of "usable" and make everything check for "connected and usable" we
- * define a port as "connected" when it is not only connected, but also when it
- * is usable by the rest of the driver. That maintains the old assumption that
- * connected ports are usable, and avoids exposing to the users objects they
- * can't really use.
- */
-static bool icl_tc_port_connected(struct drm_i915_private *dev_priv,
- struct intel_digital_port *intel_dig_port)
-{
- enum port port = intel_dig_port->base.port;
- enum tc_port tc_port = intel_port_to_tc(dev_priv, port);
- bool is_legacy, is_typec, is_tbt;
- u32 dpsp;
-
- /*
- * Complain if we got a legacy port HPD, but VBT didn't mark the port as
- * legacy. Treat the port as legacy from now on.
- */
- if (!intel_dig_port->tc_legacy_port &&
- I915_READ(SDEISR) & SDE_TC_HOTPLUG_ICP(tc_port)) {
- DRM_ERROR("VBT incorrectly claims port %c is not TypeC legacy\n",
- port_name(port));
- intel_dig_port->tc_legacy_port = true;
- }
- is_legacy = intel_dig_port->tc_legacy_port;
-
- /*
- * The spec says we shouldn't be using the ISR bits for detecting
- * between TC and TBT. We should use DFLEXDPSP.
- */
- dpsp = I915_READ(PORT_TX_DFLEXDPSP);
- is_typec = dpsp & TC_LIVE_STATE_TC(tc_port);
- is_tbt = dpsp & TC_LIVE_STATE_TBT(tc_port);
-
- if (!is_legacy && !is_typec && !is_tbt) {
- icl_tc_phy_disconnect(dev_priv, intel_dig_port);
-
- return false;
- }
-
- icl_update_tc_port_type(dev_priv, intel_dig_port, is_legacy, is_typec,
- is_tbt);
-
- if (!icl_tc_phy_connect(dev_priv, intel_dig_port))
- return false;
-
- return true;
-}
-
static bool icl_digital_port_connected(struct intel_encoder *encoder)
{
struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
@@ -5429,7 +5208,7 @@ static bool icl_digital_port_connected(struct intel_encoder *encoder)
if (intel_port_is_combophy(dev_priv, encoder->port))
return icl_combo_port_connected(dev_priv, dig_port);
else if (intel_port_is_tc(dev_priv, encoder->port))
- return icl_tc_port_connected(dev_priv, dig_port);
+ return intel_tc_port_connected(dig_port);
else
MISSING_CASE(encoder->hpd_pin);

diff --git a/drivers/gpu/drm/i915/display/intel_dp.h b/drivers/gpu/drm/i915/display/intel_dp.h
index da70b1a41c83..657bbb1f5ed0 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.h
+++ b/drivers/gpu/drm/i915/display/intel_dp.h
@@ -112,8 +112,6 @@ bool intel_dp_get_colorimetry_status(struct intel_dp *intel_dp);
int intel_dp_link_required(int pixel_clock, int bpp);
int intel_dp_max_data_rate(int max_link_clock, int max_lanes);
bool intel_digital_port_connected(struct intel_encoder *encoder);
-void icl_tc_phy_disconnect(struct drm_i915_private *dev_priv,
- struct intel_digital_port *dig_port);

static inline unsigned int intel_dp_unused_lane_mask(int lane_count)
{
diff --git a/drivers/gpu/drm/i915/display/intel_tc.c b/drivers/gpu/drm/i915/display/intel_tc.c
new file mode 100644
index 000000000000..4fa9ea695d51
--- /dev/null
+++ b/drivers/gpu/drm/i915/display/intel_tc.c
@@ -0,0 +1,230 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2019 Intel Corporation
+ */
+
+#include "intel_display.h"
+#include "i915_drv.h"
+#include "intel_tc.h"
+
+static const char *tc_type_name(enum tc_port_type type)
+{
+ static const char * const names[] = {
+ [TC_PORT_UNKNOWN] = "unknown",
+ [TC_PORT_LEGACY] = "legacy",
+ [TC_PORT_TYPEC] = "typec",
+ [TC_PORT_TBT] = "tbt",
+ };
+
+ if (WARN_ON(type >= ARRAY_SIZE(names)))
+ type = TC_PORT_UNKNOWN;
+
+ return names[type];
+}
+
+int intel_tc_port_fia_max_lane_count(struct intel_digital_port *dig_port)
+{
+ struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
+ enum tc_port tc_port = intel_port_to_tc(dev_priv, dig_port->base.port);
+ intel_wakeref_t wakeref;
+ u32 lane_info;
+
+ if (tc_port == PORT_TC_NONE || dig_port->tc_type != TC_PORT_TYPEC)
+ return 4;
+
+ lane_info = 0;
+ with_intel_display_power(dev_priv, POWER_DOMAIN_DISPLAY_CORE, wakeref)
+ lane_info = (I915_READ(PORT_TX_DFLEXDPSP) &
+ DP_LANE_ASSIGNMENT_MASK(tc_port)) >>
+ DP_LANE_ASSIGNMENT_SHIFT(tc_port);
+
+ switch (lane_info) {
+ default:
+ MISSING_CASE(lane_info);
+ case 1:
+ case 2:
+ case 4:
+ case 8:
+ return 1;
+ case 3:
+ case 12:
+ return 2;
+ case 15:
+ return 4;
+ }
+}
+
+/*
+ * This function implements the first part of the Connect Flow described by our
+ * specification, Gen11 TypeC Programming chapter. The rest of the flow (reading
+ * lanes, EDID, etc) is done as needed in the typical places.
+ *
+ * Unlike the other ports, type-C ports are not available to use as soon as we
+ * get a hotplug. The type-C PHYs can be shared between multiple controllers:
+ * display, USB, etc. As a result, handshaking through FIA is required around
+ * connect and disconnect to cleanly transfer ownership with the controller and
+ * set the type-C power state.
+ *
+ * We could opt to only do the connect flow when we actually try to use the AUX
+ * channels or do a modeset, then immediately run the disconnect flow after
+ * usage, but there are some implications on this for a dynamic environment:
+ * things may go away or change behind our backs. So for now our driver is
+ * always trying to acquire ownership of the controller as soon as it gets an
+ * interrupt (or polls state and sees a port is connected) and only gives it
+ * back when it sees a disconnect. Implementation of a more fine-grained model
+ * will require a lot of coordination with user space and thorough testing for
+ * the extra possible cases.
+ */
+static bool icl_tc_phy_connect(struct intel_digital_port *dig_port)
+{
+ struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
+ enum tc_port tc_port = intel_port_to_tc(dev_priv, dig_port->base.port);
+ u32 val;
+
+ if (dig_port->tc_type != TC_PORT_LEGACY &&
+ dig_port->tc_type != TC_PORT_TYPEC)
+ return true;
+
+ val = I915_READ(PORT_TX_DFLEXDPPMS);
+ if (!(val & DP_PHY_MODE_STATUS_COMPLETED(tc_port))) {
+ DRM_DEBUG_KMS("DP PHY for TC port %d not ready\n", tc_port);
+ WARN_ON(dig_port->tc_legacy_port);
+ return false;
+ }
+
+ /*
+ * This function may be called many times in a row without an HPD event
+ * in between, so try to avoid the write when we can.
+ */
+ val = I915_READ(PORT_TX_DFLEXDPCSSS);
+ if (!(val & DP_PHY_MODE_STATUS_NOT_SAFE(tc_port))) {
+ val |= DP_PHY_MODE_STATUS_NOT_SAFE(tc_port);
+ I915_WRITE(PORT_TX_DFLEXDPCSSS, val);
+ }
+
+ /*
+ * Now we have to re-check the live state, in case the port recently
+ * became disconnected. Not necessary for legacy mode.
+ */
+ if (dig_port->tc_type == TC_PORT_TYPEC &&
+ !(I915_READ(PORT_TX_DFLEXDPSP) & TC_LIVE_STATE_TC(tc_port))) {
+ DRM_DEBUG_KMS("TC PHY %d sudden disconnect.\n", tc_port);
+ icl_tc_phy_disconnect(dig_port);
+ return false;
+ }
+
+ return true;
+}
+
+/*
+ * See the comment at the connect function. This implements the Disconnect
+ * Flow.
+ */
+void icl_tc_phy_disconnect(struct intel_digital_port *dig_port)
+{
+ struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
+ enum tc_port tc_port = intel_port_to_tc(dev_priv, dig_port->base.port);
+
+ if (dig_port->tc_type == TC_PORT_UNKNOWN)
+ return;
+
+ /*
+ * TBT disconnection flow is read the live status, what was done in
+ * caller.
+ */
+ if (dig_port->tc_type == TC_PORT_TYPEC ||
+ dig_port->tc_type == TC_PORT_LEGACY) {
+ u32 val;
+
+ val = I915_READ(PORT_TX_DFLEXDPCSSS);
+ val &= ~DP_PHY_MODE_STATUS_NOT_SAFE(tc_port);
+ I915_WRITE(PORT_TX_DFLEXDPCSSS, val);
+ }
+
+ DRM_DEBUG_KMS("Port %c TC type %s disconnected\n",
+ port_name(dig_port->base.port),
+ tc_type_name(dig_port->tc_type));
+
+ dig_port->tc_type = TC_PORT_UNKNOWN;
+}
+
+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;
+
+ WARN_ON(is_legacy + is_typec + is_tbt != 1);
+
+ if (is_legacy)
+ intel_dig_port->tc_type = TC_PORT_LEGACY;
+ else if (is_typec)
+ intel_dig_port->tc_type = TC_PORT_TYPEC;
+ else if (is_tbt)
+ intel_dig_port->tc_type = TC_PORT_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),
+ tc_type_name(intel_dig_port->tc_type));
+}
+
+/*
+ * The type-C ports are different because even when they are connected, they may
+ * not be available/usable by the graphics driver: see the comment on
+ * icl_tc_phy_connect(). So in our driver instead of adding the additional
+ * concept of "usable" and make everything check for "connected and usable" we
+ * define a port as "connected" when it is not only connected, but also when it
+ * is usable by the rest of the driver. That maintains the old assumption that
+ * connected ports are usable, and avoids exposing to the users objects they
+ * can't really use.
+ */
+bool intel_tc_port_connected(struct intel_digital_port *dig_port)
+{
+ struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
+ enum port port = dig_port->base.port;
+ enum tc_port tc_port = intel_port_to_tc(dev_priv, port);
+ bool is_legacy, is_typec, is_tbt;
+ u32 dpsp;
+
+ /*
+ * Complain if we got a legacy port HPD, but VBT didn't mark the port as
+ * legacy. Treat the port as legacy from now on.
+ */
+ if (!dig_port->tc_legacy_port &&
+ I915_READ(SDEISR) & SDE_TC_HOTPLUG_ICP(tc_port)) {
+ DRM_ERROR("VBT incorrectly claims port %c is not TypeC legacy\n",
+ port_name(port));
+ dig_port->tc_legacy_port = true;
+ }
+ is_legacy = dig_port->tc_legacy_port;
+
+ /*
+ * The spec says we shouldn't be using the ISR bits for detecting
+ * between TC and TBT. We should use DFLEXDPSP.
+ */
+ dpsp = I915_READ(PORT_TX_DFLEXDPSP);
+ is_typec = dpsp & TC_LIVE_STATE_TC(tc_port);
+ is_tbt = dpsp & TC_LIVE_STATE_TBT(tc_port);
+
+ if (!is_legacy && !is_typec && !is_tbt) {
+ icl_tc_phy_disconnect(dig_port);
+
+ return false;
+ }
+
+ icl_update_tc_port_type(dev_priv, dig_port, is_legacy, is_typec,
+ is_tbt);
+
+ if (!icl_tc_phy_connect(dig_port))
+ return false;
+
+ return true;
+}
+
diff --git a/drivers/gpu/drm/i915/display/intel_tc.h b/drivers/gpu/drm/i915/display/intel_tc.h
new file mode 100644
index 000000000000..0c65675394e5
--- /dev/null
+++ b/drivers/gpu/drm/i915/display/intel_tc.h
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2019 Intel Corporation
+ */
+
+#ifndef __INTEL_TC_H__
+#define __INTEL_TC_H__
+
+#include <linux/types.h>
+
+struct intel_digital_port;
+
+void icl_tc_phy_disconnect(struct intel_digital_port *dig_port);
+
+bool intel_tc_port_connected(struct intel_digital_port *dig_port);
+int intel_tc_port_fia_max_lane_count(struct intel_digital_port *dig_port);
+
+#endif /* __INTEL_TC_H__ */