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// 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;
}
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