[Intel-gfx] [PATCH 03/23] drm/i915: Move the TypeC port handling code to a separate file
Jani Nikula
jani.nikula at linux.intel.com
Thu Jun 6 08:42:46 UTC 2019
On Tue, 04 Jun 2019, Imre Deak <imre.deak at intel.com> wrote:
> 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.
Some nitpicks below.
BR,
Jani.
>
> Cc: Animesh Manna <animesh.manna at intel.com>
> Cc: Paulo Zanoni <paulo.r.zanoni at intel.com>
> Cc: José Roberto de Souza <jose.souza at intel.com>
> Signed-off-by: Imre Deak <imre.deak at intel.com>
> ---
> drivers/gpu/drm/i915/Makefile | 3 +-
> drivers/gpu/drm/i915/Makefile.header-test | 1 +
> drivers/gpu/drm/i915/intel_ddi.c | 6 +-
> drivers/gpu/drm/i915/intel_dp.c | 227 +--------------------
> drivers/gpu/drm/i915/intel_dp.h | 2 -
> drivers/gpu/drm/i915/intel_tc.c | 230 ++++++++++++++++++++++
> drivers/gpu/drm/i915/intel_tc.h | 13 ++
> 7 files changed, 252 insertions(+), 230 deletions(-)
> create mode 100644 drivers/gpu/drm/i915/intel_tc.c
> create mode 100644 drivers/gpu/drm/i915/intel_tc.h
>
> diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
> index c0a7b2994077..74c4d11d83eb 100644
> --- a/drivers/gpu/drm/i915/Makefile
> +++ b/drivers/gpu/drm/i915/Makefile
> @@ -171,7 +171,8 @@ i915-y += intel_audio.o \
> intel_psr.o \
> intel_quirks.o \
> intel_sideband.o \
> - intel_sprite.o
> + intel_sprite.o \
> + intel_tc.o
> i915-$(CONFIG_ACPI) += intel_acpi.o intel_opregion.o
> i915-$(CONFIG_DRM_FBDEV_EMULATION) += intel_fbdev.o
>
> diff --git a/drivers/gpu/drm/i915/Makefile.header-test b/drivers/gpu/drm/i915/Makefile.header-test
> index 6ef3b647ac65..e80e8e45b09c 100644
> --- a/drivers/gpu/drm/i915/Makefile.header-test
> +++ b/drivers/gpu/drm/i915/Makefile.header-test
> @@ -58,6 +58,7 @@ header_test := \
> intel_sdvo.h \
> intel_sideband.h \
> intel_sprite.h \
> + intel_tc.h \
> intel_tv.h \
> intel_uncore.h \
> intel_vdsc.h \
> diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
> index 350eaf54f01f..5a1c98438375 100644
> --- a/drivers/gpu/drm/i915/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/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 {
> @@ -3904,7 +3905,6 @@ 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);
>
> @@ -3914,7 +3914,7 @@ 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)
> @@ -3936,7 +3936,7 @@ 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/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 24b56b2a76c8..b69310bd9914 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/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);
> }
> @@ -5231,195 +5199,6 @@ 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);
> @@ -5428,7 +5207,7 @@ 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/intel_dp.h b/drivers/gpu/drm/i915/intel_dp.h
> index da70b1a41c83..657bbb1f5ed0 100644
> --- a/drivers/gpu/drm/i915/intel_dp.h
> +++ b/drivers/gpu/drm/i915/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/intel_tc.c b/drivers/gpu/drm/i915/intel_tc.c
> new file mode 100644
> index 000000000000..7a1b5870945f
> --- /dev/null
> +++ b/drivers/gpu/drm/i915/intel_tc.c
> @@ -0,0 +1,230 @@
> +// SPDX-License-Identifier: MIT
> +/*
> + * Copyright © 2019 Intel Corporation
> + */
>From the Nitpicks Department, please add a blank line here.
> +#include "intel_display.h"
> +#include "i915_drv.h"
> +#include "intel_tc.h"
And sort the includes.
> +
> +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/intel_tc.h b/drivers/gpu/drm/i915/intel_tc.h
> new file mode 100644
> index 000000000000..94c62ac4a162
> --- /dev/null
> +++ b/drivers/gpu/drm/i915/intel_tc.h
> @@ -0,0 +1,13 @@
SPDX header here please.
> +#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);
I'd like to see this named intel_tc_* in the future.
BR,
Jani.
> +
> +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__ */
--
Jani Nikula, Intel Open Source Graphics Center
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