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synced 2024-09-30 06:10:56 +00:00
drm/i915/tc: Fix TypeC PHY connect/disconnect logic on ADL-P
So far TC-cold was blocked only for the duration of TypeC mode resets. The DP-alt and legacy modes require TC-cold to be blocked also whenever the port is in use (AUX transfers, enable modeset), and this was ensured by the held PHY ownership flag. On ADL-P this doesn't work, since the PHY ownership flag is in a register backed by the PW#2 power well. Whenever this power well is disabled the ownership flag is cleared by the HW under the driver. The only way to cleanly release and re-acquire the PHY ownership flag and also allow for power saving (by disabling the display power wells and reaching DC5/6 states) is to hold the TC-cold blocking power domains while the PHY is connected and disconnect/reconnect the PHY on-demand around AUX transfers and modeset enable/disables. Let's do that, disconnecting a PHY with a 1 sec delay after it becomes idle. For consistency do this on all platforms and TypeC modes. v2: Add tc_mode!=disconnected and phy_is_owned asserts to __intel_tc_port_lock(). Cc: José Roberto de Souza <jose.souza@intel.com> 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/20210929132833.2253961-6-imre.deak@intel.com
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parent
38c393462d
commit
3e0abc7661
4 changed files with 65 additions and 38 deletions
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@ -4017,8 +4017,11 @@ static void intel_ddi_encoder_destroy(struct drm_encoder *encoder)
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{
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struct drm_i915_private *i915 = to_i915(encoder->dev);
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struct intel_digital_port *dig_port = enc_to_dig_port(to_intel_encoder(encoder));
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enum phy phy = intel_port_to_phy(i915, dig_port->base.port);
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intel_dp_encoder_flush_work(encoder);
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if (intel_phy_is_tc(i915, phy))
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intel_tc_port_flush_work(dig_port);
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intel_display_power_flush_work(i915);
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drm_encoder_cleanup(encoder);
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@ -4443,7 +4446,7 @@ static void intel_ddi_encoder_suspend(struct intel_encoder *encoder)
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if (!intel_phy_is_tc(i915, phy))
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return;
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intel_tc_port_disconnect_phy(dig_port);
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intel_tc_port_flush_work(dig_port);
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}
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static void intel_ddi_encoder_shutdown(struct intel_encoder *encoder)
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@ -4458,7 +4461,7 @@ static void intel_ddi_encoder_shutdown(struct intel_encoder *encoder)
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if (!intel_phy_is_tc(i915, phy))
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return;
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intel_tc_port_disconnect_phy(dig_port);
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intel_tc_port_flush_work(dig_port);
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}
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#define port_tc_name(port) ((port) - PORT_TC1 + '1')
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@ -1666,6 +1666,7 @@ struct intel_digital_port {
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struct mutex tc_lock; /* protects the TypeC port mode */
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intel_wakeref_t tc_lock_wakeref;
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enum intel_display_power_domain tc_lock_power_domain;
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struct delayed_work tc_disconnect_phy_work;
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int tc_link_refcount;
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bool tc_legacy_port:1;
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char tc_port_name[8];
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@ -666,6 +666,13 @@ static void intel_tc_port_update_mode(struct intel_digital_port *dig_port,
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intel_tc_port_reset_mode(dig_port, required_lanes, force_disconnect);
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/* Get power domain matching the new mode after reset. */
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tc_cold_unblock(dig_port, dig_port->tc_lock_power_domain,
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fetch_and_zero(&dig_port->tc_lock_wakeref));
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if (dig_port->tc_mode != TC_PORT_DISCONNECTED)
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dig_port->tc_lock_wakeref = tc_cold_block(dig_port,
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&dig_port->tc_lock_power_domain);
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tc_cold_unblock(dig_port, domain, wref);
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}
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@ -693,6 +700,7 @@ void intel_tc_port_sanitize(struct intel_digital_port *dig_port)
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active_links = to_intel_crtc(encoder->base.crtc)->active;
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drm_WARN_ON(&i915->drm, dig_port->tc_mode != TC_PORT_DISCONNECTED);
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drm_WARN_ON(&i915->drm, dig_port->tc_lock_wakeref);
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if (active_links) {
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enum intel_display_power_domain domain;
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intel_wakeref_t tc_cold_wref = tc_cold_block(dig_port, &domain);
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@ -705,6 +713,9 @@ void intel_tc_port_sanitize(struct intel_digital_port *dig_port)
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dig_port->tc_port_name, active_links);
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intel_tc_port_link_init_refcount(dig_port, active_links);
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dig_port->tc_lock_wakeref = tc_cold_block(dig_port,
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&dig_port->tc_lock_power_domain);
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tc_cold_unblock(dig_port, domain, tc_cold_wref);
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}
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@ -745,56 +756,67 @@ bool intel_tc_port_connected(struct intel_encoder *encoder)
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}
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static void __intel_tc_port_lock(struct intel_digital_port *dig_port,
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int required_lanes, bool force_disconnect)
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int required_lanes)
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{
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struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
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intel_wakeref_t wakeref;
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wakeref = intel_display_power_get(i915, POWER_DOMAIN_DISPLAY_CORE);
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mutex_lock(&dig_port->tc_lock);
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cancel_delayed_work(&dig_port->tc_disconnect_phy_work);
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if (!dig_port->tc_link_refcount)
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intel_tc_port_update_mode(dig_port, required_lanes,
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force_disconnect);
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false);
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drm_WARN_ON(&i915->drm, dig_port->tc_lock_wakeref);
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dig_port->tc_lock_wakeref = wakeref;
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drm_WARN_ON(&i915->drm, dig_port->tc_mode == TC_PORT_DISCONNECTED);
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drm_WARN_ON(&i915->drm, dig_port->tc_mode != TC_PORT_TBT_ALT &&
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!tc_phy_is_owned(dig_port));
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}
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void intel_tc_port_lock(struct intel_digital_port *dig_port)
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{
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__intel_tc_port_lock(dig_port, 1, false);
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__intel_tc_port_lock(dig_port, 1);
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}
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/**
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* intel_tc_port_disconnect_phy_work: disconnect TypeC PHY from display port
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* @dig_port: digital port
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*
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* Disconnect the given digital port from its TypeC PHY (handing back the
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* control of the PHY to the TypeC subsystem). This will happen in a delayed
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* manner after each aux transactions and modeset disables.
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*/
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static void intel_tc_port_disconnect_phy_work(struct work_struct *work)
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{
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struct intel_digital_port *dig_port =
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container_of(work, struct intel_digital_port, tc_disconnect_phy_work.work);
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mutex_lock(&dig_port->tc_lock);
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if (!dig_port->tc_link_refcount)
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intel_tc_port_update_mode(dig_port, 1, true);
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mutex_unlock(&dig_port->tc_lock);
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}
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/**
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* intel_tc_port_flush_work: flush the work disconnecting the PHY
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* @dig_port: digital port
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*
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* Flush the delayed work disconnecting an idle PHY.
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*/
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void intel_tc_port_flush_work(struct intel_digital_port *dig_port)
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{
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flush_delayed_work(&dig_port->tc_disconnect_phy_work);
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}
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void intel_tc_port_unlock(struct intel_digital_port *dig_port)
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{
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struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
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intel_wakeref_t wakeref = fetch_and_zero(&dig_port->tc_lock_wakeref);
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if (!dig_port->tc_link_refcount && dig_port->tc_mode != TC_PORT_DISCONNECTED)
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queue_delayed_work(system_unbound_wq, &dig_port->tc_disconnect_phy_work,
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msecs_to_jiffies(1000));
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mutex_unlock(&dig_port->tc_lock);
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intel_display_power_put_async(i915, POWER_DOMAIN_DISPLAY_CORE,
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wakeref);
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}
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/**
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* intel_tc_port_disconnect_phy: disconnect TypeC PHY from display port
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* @dig_port: digital port
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*
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* Disconnect the given digital port from its TypeC PHY (handing back the
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* control of the PHY to the TypeC subsystem). The only purpose of this
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* function is to force the disconnect even with a TypeC display output still
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* plugged to the TypeC connector, which is required by the TypeC firmwares
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* during system suspend and shutdown. Otherwise - during the unplug event
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* handling - the PHY ownership is released automatically by
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* intel_tc_port_reset_mode(), when calling this function is not required.
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*/
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void intel_tc_port_disconnect_phy(struct intel_digital_port *dig_port)
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{
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__intel_tc_port_lock(dig_port, 1, true);
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intel_tc_port_unlock(dig_port);
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}
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bool intel_tc_port_ref_held(struct intel_digital_port *dig_port)
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@ -806,16 +828,16 @@ bool intel_tc_port_ref_held(struct intel_digital_port *dig_port)
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void intel_tc_port_get_link(struct intel_digital_port *dig_port,
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int required_lanes)
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{
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__intel_tc_port_lock(dig_port, required_lanes, false);
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__intel_tc_port_lock(dig_port, required_lanes);
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dig_port->tc_link_refcount++;
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intel_tc_port_unlock(dig_port);
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}
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void intel_tc_port_put_link(struct intel_digital_port *dig_port)
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{
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mutex_lock(&dig_port->tc_lock);
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dig_port->tc_link_refcount--;
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mutex_unlock(&dig_port->tc_lock);
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intel_tc_port_lock(dig_port);
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--dig_port->tc_link_refcount;
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intel_tc_port_unlock(dig_port);
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}
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static bool
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@ -871,6 +893,7 @@ void intel_tc_port_init(struct intel_digital_port *dig_port, bool is_legacy)
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"%c/TC#%d", port_name(port), tc_port + 1);
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mutex_init(&dig_port->tc_lock);
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INIT_DELAYED_WORK(&dig_port->tc_disconnect_phy_work, intel_tc_port_disconnect_phy_work);
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dig_port->tc_legacy_port = is_legacy;
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dig_port->tc_mode = TC_PORT_DISCONNECTED;
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dig_port->tc_link_refcount = 0;
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@ -17,7 +17,6 @@ bool intel_tc_port_in_dp_alt_mode(struct intel_digital_port *dig_port);
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bool intel_tc_port_in_legacy_mode(struct intel_digital_port *dig_port);
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bool intel_tc_port_connected(struct intel_encoder *encoder);
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void intel_tc_port_disconnect_phy(struct intel_digital_port *dig_port);
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u32 intel_tc_port_get_lane_mask(struct intel_digital_port *dig_port);
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u32 intel_tc_port_get_pin_assignment_mask(struct intel_digital_port *dig_port);
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@ -28,6 +27,7 @@ void intel_tc_port_set_fia_lane_count(struct intel_digital_port *dig_port,
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void intel_tc_port_sanitize(struct intel_digital_port *dig_port);
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void intel_tc_port_lock(struct intel_digital_port *dig_port);
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void intel_tc_port_unlock(struct intel_digital_port *dig_port);
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void intel_tc_port_flush_work(struct intel_digital_port *dig_port);
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void intel_tc_port_get_link(struct intel_digital_port *dig_port,
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int required_lanes);
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void intel_tc_port_put_link(struct intel_digital_port *dig_port);
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