/*
* Copyright 2022 Advanced Micro Devices, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* Authors: AMD
*
*/
/* FILE POLICY AND INTENDED USAGE:
* This file manages link detection states and receiver states by using various
* link protocols. It also provides helper functions to interpret certain
* capabilities or status based on the states it manages or retrieve them
* directly from connected receivers.
*/
#include "link_dpms.h"
#include "link_detection.h"
#include "link_hwss.h"
#include "protocols/link_edp_panel_control.h"
#include "protocols/link_ddc.h"
#include "protocols/link_hpd.h"
#include "protocols/link_dpcd.h"
#include "protocols/link_dp_capability.h"
#include "protocols/link_dp_dpia.h"
#include "protocols/link_dp_phy.h"
#include "protocols/link_dp_training.h"
#include "protocols/link_dp_dpia_bw.h"
#include "accessories/link_dp_trace.h"
#include "link_enc_cfg.h"
#include "dm_helpers.h"
#include "clk_mgr.h"
#define DC_LOGGER \
link->ctx->logger
#define DC_LOGGER_INIT(logger)
#define LINK_INFO(...) \
DC_LOG_HW_HOTPLUG( \
__VA_ARGS__)
/*
* Some receivers fail to train on first try and are good
* on subsequent tries. 2 retries should be plenty. If we
* don't have a successful training then we don't expect to
* ever get one.
*/
#define LINK_TRAINING_MAX_VERIFY_RETRY 2
static const u8 DP_SINK_BRANCH_DEV_NAME_7580[] = "7580\x80u";
static const u8 dp_hdmi_dongle_signature_str[] = "DP-HDMI ADAPTOR";
static enum ddc_transaction_type get_ddc_transaction_type(enum signal_type sink_signal)
{
enum ddc_transaction_type transaction_type = DDC_TRANSACTION_TYPE_NONE;
switch (sink_signal) {
case SIGNAL_TYPE_DVI_SINGLE_LINK:
case SIGNAL_TYPE_DVI_DUAL_LINK:
case SIGNAL_TYPE_HDMI_TYPE_A:
case SIGNAL_TYPE_LVDS:
case SIGNAL_TYPE_RGB:
transaction_type = DDC_TRANSACTION_TYPE_I2C;
break;
case SIGNAL_TYPE_DISPLAY_PORT:
case SIGNAL_TYPE_EDP:
transaction_type = DDC_TRANSACTION_TYPE_I2C_OVER_AUX;
break;
case SIGNAL_TYPE_DISPLAY_PORT_MST:
/* MST does not use I2COverAux, but there is the
* SPECIAL use case for "immediate dwnstrm device
* access" (EPR#370830).
*/
transaction_type = DDC_TRANSACTION_TYPE_I2C_OVER_AUX;
break;
default:
break;
}
return transaction_type;
}
static enum signal_type get_basic_signal_type(struct graphics_object_id encoder,
struct graphics_object_id downstream)
{
if (downstream.type == OBJECT_TYPE_CONNECTOR) {
switch (downstream.id) {
case CONNECTOR_ID_SINGLE_LINK_DVII:
switch (encoder.id) {
case ENCODER_ID_INTERNAL_DAC1:
case ENCODER_ID_INTERNAL_KLDSCP_DAC1:
case ENCODER_ID_INTERNAL_DAC2:
case ENCODER_ID_INTERNAL_KLDSCP_DAC2:
return SIGNAL_TYPE_RGB;
default:
return SIGNAL_TYPE_DVI_SINGLE_LINK;
}
break;
case CONNECTOR_ID_DUAL_LINK_DVII:
{
switch (encoder.id) {
case ENCODER_ID_INTERNAL_DAC1:
case ENCODER_ID_INTERNAL_KLDSCP_DAC1:
case ENCODER_ID_INTERNAL_DAC2:
case ENCODER_ID_INTERNAL_KLDSCP_DAC2:
return SIGNAL_TYPE_RGB;
default:
return SIGNAL_TYPE_DVI_DUAL_LINK;
}
}
break;
case CONNECTOR_ID_SINGLE_LINK_DVID:
return SIGNAL_TYPE_DVI_SINGLE_LINK;
case CONNECTOR_ID_DUAL_LINK_DVID:
return SIGNAL_TYPE_DVI_DUAL_LINK;
case CONNECTOR_ID_VGA:
return SIGNAL_TYPE_RGB;
case CONNECTOR_ID_HDMI_TYPE_A:
return SIGNAL_TYPE_HDMI_TYPE_A;
case CONNECTOR_ID_LVDS:
return SIGNAL_TYPE_LVDS;
case CONNECTOR_ID_DISPLAY_PORT:
case CONNECTOR_ID_USBC:
return SIGNAL_TYPE_DISPLAY_PORT;
case CONNECTOR_ID_EDP:
return SIGNAL_TYPE_EDP;
default:
return SIGNAL_TYPE_NONE;
}
} else if (downstream.type == OBJECT_TYPE_ENCODER) {
switch (downstream.id) {
case ENCODER_ID_EXTERNAL_NUTMEG:
case ENCODER_ID_EXTERNAL_TRAVIS:
return SIGNAL_TYPE_DISPLAY_PORT;
default:
return SIGNAL_TYPE_NONE;
}
}
return SIGNAL_TYPE_NONE;
}
/*
* @brief
* Detect output sink type
*/
static enum signal_type link_detect_sink_signal_type(struct dc_link *link,
enum dc_detect_reason reason)
{
enum signal_type result;
struct graphics_object_id enc_id;
if (link->is_dig_mapping_flexible)
enc_id = (struct graphics_object_id){.id = ENCODER_ID_UNKNOWN};
else
enc_id = link->link_enc->id;
result = get_basic_signal_type(enc_id, link->link_id);
/* Use basic signal type for link without physical connector. */
if (link->ep_type != DISPLAY_ENDPOINT_PHY)
return result;
/* Internal digital encoder will detect only dongles
* that require digital signal
*/
/* Detection mechanism is different
* for different native connectors.
* LVDS connector supports only LVDS signal;
* PCIE is a bus slot, the actual connector needs to be detected first;
* eDP connector supports only eDP signal;
* HDMI should check straps for audio
*/
/* PCIE detects the actual connector on add-on board */
if (link->link_id.id == CONNECTOR_ID_PCIE) {
/* ZAZTODO implement PCIE add-on card detection */
}
switch (link->link_id.id) {
case CONNECTOR_ID_HDMI_TYPE_A: {
/* check audio support:
* if native HDMI is not supported, switch to DVI
*/
struct audio_support *aud_support =
&link->dc->res_pool->audio_support;
if (!aud_support->hdmi_audio_native)
if (link->link_id.id == CONNECTOR_ID_HDMI_TYPE_A)
result = SIGNAL_TYPE_DVI_SINGLE_LINK;
}
break;
case CONNECTOR_ID_DISPLAY_PORT:
case CONNECTOR_ID_USBC: {
/* DP HPD short pulse. Passive DP dongle will not
* have short pulse
*/
if (reason != DETECT_REASON_HPDRX) {
/* Check whether DP signal detected: if not -
* we assume signal is DVI; it could be corrected
* to HDMI after dongle detection
*/
if (!dm_helpers_is_dp_sink_present(link))
result = SIGNAL_TYPE_DVI_SINGLE_LINK;
}
}
break;
default:
break;
}
return result;
}
static enum signal_type decide_signal_from_strap_and_dongle_type(enum display_dongle_type dongle_type,
struct audio_support *audio_support)
{
enum signal_type signal = SIGNAL_TYPE_NONE;
switch (dongle_type) {
case DISPLAY_DONGLE_DP_HDMI_DONGLE:
if (audio_support->hdmi_audio_on_dongle)
signal = SIGNAL_TYPE_HDMI_TYPE_A;
else
signal = SIGNAL_TYPE_DVI_SINGLE_LINK;
break;
case DISPLAY_DONGLE_DP_DVI_DONGLE:
signal = SIGNAL_TYPE_DVI_SINGLE_LINK;
break;
case DISPLAY_DONGLE_DP_HDMI_MISMATCHED_DONGLE:
if (audio_support->hdmi_audio_native)
signal = SIGNAL_TYPE_HDMI_TYPE_A;
else
signal = SIGNAL_TYPE_DVI_SINGLE_LINK;
break;
default:
signal = SIGNAL_TYPE_NONE;
break;
}
return signal;
}
static void read_scdc_caps(struct ddc_service *ddc_service,
struct dc_sink *sink)
{
uint8_t slave_address = HDMI_SCDC_ADDRESS;
uint8_t offset = HDMI_SCDC_MANUFACTURER_OUI;
link_query_ddc_data(ddc_service, slave_address, &offset,
sizeof(offset), sink->scdc_caps.manufacturer_OUI.byte,
sizeof(sink->scdc_caps.manufacturer_OUI.byte));
offset = HDMI_SCDC_DEVICE_ID;
link_query_ddc_data(ddc_service, slave_address, &offset,
sizeof(offset), &(sink->scdc_caps.device_id.byte),
sizeof(sink->scdc_caps.device_id.byte));
}
static bool i2c_read(
struct ddc_service *ddc,
uint32_t address,
uint8_t *buffer,
uint32_t len)
{
uint8_t offs_data = 0;
struct i2c_payload payloads[2] = {
{
.write = true,
.address = address,
.length = 1,
.data = &offs_data },
{
.write = false,
.address = address,
.length = len,
.data = buffer } };
struct i2c_command command = {
.payloads = payloads,
.number_of_payloads = 2,
.engine = DDC_I2C_COMMAND_ENGINE,
.speed = ddc->ctx->dc->caps.i2c_speed_in_khz };
return dm_helpers_submit_i2c(
ddc->ctx,
ddc->link,
&command);
}
enum {
DP_SINK_CAP_SIZE =
DP_EDP_CONFIGURATION_CAP - DP_DPCD_REV + 1
};
static void query_dp_dual_mode_adaptor(
struct ddc_service *ddc,
struct display_sink_capability *sink_cap)
{
uint8_t i;
bool is_valid_hdmi_signature;
enum display_dongle_type *dongle = &sink_cap->dongle_type;
uint8_t type2_dongle_buf[DP_ADAPTOR_TYPE2_SIZE];
bool is_type2_dongle = false;
int retry_count = 2;
struct dp_hdmi_dongle_signature_data *dongle_signature;
struct dc_link *link = ddc->link;
/* Assume we have no valid DP passive dongle connected */
*dongle = DISPLAY_DONGLE_NONE;
sink_cap->max_hdmi_pixel_clock = DP_ADAPTOR_HDMI_SAFE_MAX_TMDS_CLK;
/* Read DP-HDMI dongle I2c (no response interpreted as DP-DVI dongle)*/
if (!i2c_read(
ddc,
DP_HDMI_DONGLE_ADDRESS,
type2_dongle_buf,
sizeof(type2_dongle_buf))) {
/* Passive HDMI dongles can sometimes fail here without retrying*/
while (retry_count > 0) {
if (i2c_read(ddc,
DP_HDMI_DONGLE_ADDRESS,
type2_dongle_buf,
sizeof(type2_dongle_buf)))
break;
retry_count--;
}
if (retry_count == 0) {
*dongle = DISPLAY_DONGLE_DP_DVI_DONGLE;
sink_cap->max_hdmi_pixel_clock = DP_ADAPTOR_DVI_MAX_TMDS_CLK;
CONN_DATA_DETECT(ddc->link, type2_dongle_buf, sizeof(type2_dongle_buf),
"DP-DVI passive dongle %dMhz: ",
DP_ADAPTOR_DVI_MAX_TMDS_CLK / 1000);
return;
}
}
/* Check if Type 2 dongle.*/
if (type2_dongle_buf[DP_ADAPTOR_TYPE2_REG_ID] == DP_ADAPTOR_TYPE2_ID)
is_type2_dongle = true;
dongle_signature =
(struct dp_hdmi_dongle_signature_data *)type2_dongle_buf;
is_valid_hdmi_signature = true;
/* Check EOT */
if (dongle_signature->eot != DP_HDMI_DONGLE_SIGNATURE_EOT) {
is_valid_hdmi_signature = false;
}
/* Check signature */
for (i = 0; i < sizeof(dongle_signature->id); ++i) {
/* If its not the right signature,
* skip mismatch in subversion byte.*/
if (dongle_signature->id[i] !=
dp_hdmi_dongle_signature_str[i] && i != 3) {
if (is_type2_dongle) {
is_valid_hdmi_signature = false;
break;
}
}
}
if (is_type2_dongle) {
uint32_t max_tmds_clk =
type2_dongle_buf[DP_ADAPTOR_TYPE2_REG_MAX_TMDS_CLK];
max_tmds_clk = max_tmds_clk * 2 + max_tmds_clk / 2;
if (0 == max_tmds_clk ||
max_tmds_clk < DP_ADAPTOR_TYPE2_MIN_TMDS_CLK ||
max_tmds_clk > DP_ADAPTOR_TYPE2_MAX_TMDS_CLK) {
*dongle = DISPLAY_DONGLE_DP_DVI_DONGLE;
CONN_DATA_DETECT(ddc->link, type2_dongle_buf,
sizeof(type2_dongle_buf),
"DP-DVI passive dongle %dMhz: ",
DP_ADAPTOR_DVI_MAX_TMDS_CLK / 1000);
} else {
if (is_valid_hdmi_signature == true) {
*dongle = DISPLAY_DONGLE_DP_HDMI_DONGLE;
CONN_DATA_DETECT(ddc->link, type2_dongle_buf,
sizeof(type2_dongle_buf),
"Type 2 DP-HDMI passive dongle %dMhz: ",
max_tmds_clk);
} else {
*dongle = DISPLAY_DONGLE_DP_HDMI_MISMATCHED_DONGLE;
CONN_DATA_DETECT(ddc->link, type2_dongle_buf,
sizeof(type2_dongle_buf),
"Type 2 DP-HDMI passive dongle (no signature) %dMhz: ",
max_tmds_clk);
}
/* Multiply by 1000 to convert to kHz. */
sink_cap->max_hdmi_pixel_clock =
max_tmds_clk * 1000;
}
sink_cap->is_dongle_type_one = false;
} else {
if (is_valid_hdmi_signature == true) {
*dongle = DISPLAY_DONGLE_DP_HDMI_DONGLE;
CONN_DATA_DETECT(ddc->link, type2_dongle_buf,
sizeof(type2_dongle_buf),
"Type 1 DP-HDMI passive dongle %dMhz: ",
sink_cap->max_hdmi_pixel_clock / 1000);
} else {
*dongle = DISPLAY_DONGLE_DP_HDMI_MISMATCHED_DONGLE;
CONN_DATA_DETECT(ddc->link, type2_dongle_buf,
sizeof(type2_dongle_buf),
"Type 1 DP-HDMI passive dongle (no signature) %dMhz: ",
sink_cap->max_hdmi_pixel_clock / 1000);
}
sink_cap->is_dongle_type_one = true;
}
return;
}
static enum signal_type dp_passive_dongle_detection(struct ddc_service *ddc,
struct display_sink_capability *sink_cap,
struct audio_support *audio_support)
{
query_dp_dual_mode_adaptor(ddc, sink_cap);
return decide_signal_from_strap_and_dongle_type(sink_cap->dongle_type,
audio_support);
}
static void link_disconnect_sink(struct dc_link *link)
{
if (link->local_sink) {
dc_sink_release(link->local_sink);
link->local_sink = NULL;
}
link->dpcd_sink_count = 0;
//link->dpcd_caps.dpcd_rev.raw = 0;
}
static void link_disconnect_remap(struct dc_sink *prev_sink, struct dc_link *link)
{
dc_sink_release(link->local_sink);
link->local_sink = prev_sink;
}
static void query_hdcp_capability(enum signal_type signal, struct dc_link *link)
{
struct hdcp_protection_message msg22;
struct hdcp_protection_message msg14;
memset(&msg22, 0, sizeof(struct hdcp_protection_message));
memset(&msg14, 0, sizeof(struct hdcp_protection_message));
memset(link->hdcp_caps.rx_caps.raw, 0,
sizeof(link->hdcp_caps.rx_caps.raw));
if ((link->connector_signal == SIGNAL_TYPE_DISPLAY_PORT &&
link->ddc->transaction_type ==
DDC_TRANSACTION_TYPE_I2C_OVER_AUX) ||
link->connector_signal == SIGNAL_TYPE_EDP) {
msg22.data = link->hdcp_caps.rx_caps.raw;
msg22.length = sizeof(link->hdcp_caps.rx_caps.raw);
msg22.msg_id = HDCP_MESSAGE_ID_RX_CAPS;
} else {
msg22.data = &link->hdcp_caps.rx_caps.fields.version;
msg22.length = sizeof(link->hdcp_caps.rx_caps.fields.version);
msg22.msg_id = HDCP_MESSAGE_ID_HDCP2VERSION;
}
msg22.version = HDCP_VERSION_22;
msg22.link = HDCP_LINK_PRIMARY;
msg22.max_retries = 5;
dc_process_hdcp_msg(signal, link, &msg22);
if (signal == SIGNAL_TYPE_DISPLAY_PORT || signal == SIGNAL_TYPE_DISPLAY_PORT_MST) {
msg14.data = &link->hdcp_caps.bcaps.raw;
msg14.length = sizeof(link->hdcp_caps.bcaps.raw);
msg14.msg_id = HDCP_MESSAGE_ID_READ_BCAPS;
msg14.version = HDCP_VERSION_14;
msg14.link = HDCP_LINK_PRIMARY;
msg14.max_retries = 5;
dc_process_hdcp_msg(signal, link, &msg14);
}
}
static void read_current_link_settings_on_detect(struct dc_link *link)
{
union lane_count_set lane_count_set = {0};
uint8_t link_bw_set = 0;
uint8_t link_rate_set = 0;
uint32_t read_dpcd_retry_cnt = 10;
enum dc_status status = DC_ERROR_UNEXPECTED;
int i;
union max_down_spread max_down_spread = {0};
// Read DPCD 00101h to find out the number of lanes currently set
for (i = 0; i < read_dpcd_retry_cnt; i++) {
status = core_link_read_dpcd(link,
DP_LANE_COUNT_SET,
&lane_count_set.raw,
sizeof(lane_count_set));
/* First DPCD read after VDD ON can fail if the particular board
* does not have HPD pin wired correctly. So if DPCD read fails,
* which it should never happen, retry a few times. Target worst
* case scenario of 80 ms.
*/
if (status == DC_OK) {
link->cur_link_settings.lane_count =
lane_count_set.bits.LANE_COUNT_SET;
break;
}
msleep(8);
}
// Read DPCD 00100h to find if standard link rates are set
core_link_read_dpcd(link, DP_LINK_BW_SET,
&link_bw_set, sizeof(link_bw_set));
if (link_bw_set == 0) {
if (link->connector_signal == SIGNAL_TYPE_EDP) {
/* If standard link rates are not being used,
* Read DPCD 00115h to find the edp link rate set used
*/
core_link_read_dpcd(link, DP_LINK_RATE_SET,
&link_rate_set, sizeof(link_rate_set));
// edp_supported_link_rates_count = 0 for DP
if (link_rate_set < link->dpcd_caps.edp_supported_link_rates_count) {
link->cur_link_settings.link_rate =
link->dpcd_caps.edp_supported_link_rates[link_rate_set];
link->cur_link_settings.link_rate_set = link_rate_set;
link->cur_link_settings.use_link_rate_set = true;
}
} else {
// Link Rate not found. Seamless boot may not work.
ASSERT(false);
}
} else {
link->cur_link_settings.link_rate = link_bw_set;
link->cur_link_settings.use_link_rate_set = false;
}
// Read DPCD 00003h to find the max down spread.
core_link_read_dpcd(link, DP_MAX_DOWNSPREAD,
&max_down_spread.raw, sizeof(max_down_spread));
link->cur_link_settings.link_spread =
max_down_spread.bits.MAX_DOWN_SPREAD ?
LINK_SPREAD_05_DOWNSPREAD_30KHZ : LINK_SPREAD_DISABLED;
}
static bool detect_dp(struct dc_link *link,
struct display_sink_capability *sink_caps,
enum dc_detect_reason reason)
{
struct audio_support *audio_support = &link->dc->res_pool->audio_support;
sink_caps->signal = link_detect_sink_signal_type(link, reason);
sink_caps->transaction_type =
get_ddc_transaction_type(sink_caps->signal);
if (sink_caps->transaction_type == DDC_TRANSACTION_TYPE_I2C_OVER_AUX) {
sink_caps->signal = SIGNAL_TYPE_DISPLAY_PORT;
if (!detect_dp_sink_caps(link))
return false;
if (is_dp_branch_device(link))
/* DP SST branch */
link->type = dc_connection_sst_branch;
} else {
if (link->dc->debug.disable_dp_plus_plus_wa &&
link->link_enc->features.flags.bits.IS_UHBR20_CAPABLE)
return false;
/* DP passive dongles */
sink_caps->signal = dp_passive_dongle_detection(link->ddc,
sink_caps,
audio_support);
link->dpcd_caps.dongle_type = sink_caps->dongle_type;
link->dpcd_caps.is_dongle_type_one = sink_caps->is_dongle_type_one;
link->dpcd_caps.dpcd_rev.raw = 0;
}
return true;
}
static bool is_same_edid(struct dc_edid *old_edid, struct dc_edid *new_edid)
{
if (old_edid->length != new_edid->length)
return false;
if (new_edid->length == 0)
return false;
return (memcmp(old_edid->raw_edid,
new_edid->raw_edid, new_edid->length) == 0);
}
static bool wait_for_entering_dp_alt_mode(struct dc_link *link)
{
/**
* something is terribly wrong if time out is > 200ms. (5Hz)
* 500 microseconds * 400 tries us 200 ms
**/
unsigned int sleep_time_in_microseconds = 500;
unsigned int tries_allowed = 400;
bool is_in_alt_mode;
unsigned long long enter_timestamp;
unsigned long long finish_timestamp;
unsigned long long time_taken_in_ns;
int tries_taken;
DC_LOGGER_INIT(link->ctx->logger);
/**
* this function will only exist if we are on dcn21 (is_in_alt_mode is a
* function pointer, so checking to see if it is equal to 0 is the same
* as checking to see if it is null
**/
if (!link->link_enc->funcs->is_in_alt_mode)
return true;
is_in_alt_mode = link->link_enc->funcs->is_in_alt_mode(link->link_enc);
DC_LOG_DC("DP Alt mode state on HPD: %d\n", is_in_alt_mode);
if (is_in_alt_mode)
return true;
enter_timestamp = dm_get_timestamp(link->ctx);
for (tries_taken = 0; tries_taken < tries_allowed; tries_taken++) {
udelay(sleep_time_in_microseconds);
/* ask the link if alt mode is enabled, if so return ok */
if (link->link_enc->funcs->is_in_alt_mode(link->link_enc)) {
finish_timestamp = dm_get_timestamp(link->ctx);
time_taken_in_ns =
dm_get_elapse_time_in_ns(link->ctx,
finish_timestamp,
enter_timestamp);
DC_LOG_WARNING("Alt mode entered finished after %llu ms\n",
div_u64(time_taken_in_ns, 1000000));
return true;
}
}
finish_timestamp = dm_get_timestamp(link->ctx);
time_taken_in_ns = dm_get_elapse_time_in_ns(link->ctx, finish_timestamp,
enter_timestamp);
DC_LOG_WARNING("Alt mode has timed out after %llu ms\n",
div_u64(time_taken_in_ns, 1000000));
return false;
}
static void apply_dpia_mst_dsc_always_on_wa(struct dc_link *link)
{
/* Apply work around for tunneled MST on certain USB4 docks. Always use DSC if dock
* reports DSC support.
*/
if (link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA &&
link->type == dc_connection_mst_branch &&
link->dpcd_caps.branch_dev_id == DP_BRANCH_DEVICE_ID_90CC24 &&
link->dpcd_caps.branch_hw_revision == DP_BRANCH_HW_REV_20 &&
link->dpcd_caps.dsc_caps.dsc_basic_caps.fields.dsc_support.DSC_SUPPORT &&
!link->dc->debug.dpia_debug.bits.disable_mst_dsc_work_around)
link->wa_flags.dpia_mst_dsc_always_on = true;
}
static void revert_dpia_mst_dsc_always_on_wa(struct dc_link *link)
{
/* Disable work around which keeps DSC on for tunneled MST on certain USB4 docks. */
if (link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA)
link->wa_flags.dpia_mst_dsc_always_on = false;
}
static bool discover_dp_mst_topology(struct dc_link *link, enum dc_detect_reason reason)
{
DC_LOGGER_INIT(link->ctx->logger);
LINK_INFO("link=%d, mst branch is now Connected\n",
link->link_index);
link->type = dc_connection_mst_branch;
apply_dpia_mst_dsc_always_on_wa(link);
dm_helpers_dp_update_branch_info(link->ctx, link);
if (dm_helpers_dp_mst_start_top_mgr(link->ctx,
link, (reason == DETECT_REASON_BOOT || reason == DETECT_REASON_RESUMEFROMS3S4))) {
link_disconnect_sink(link);
} else {
link->type = dc_connection_sst_branch;
}
return link->type == dc_connection_mst_branch;
}
bool link_reset_cur_dp_mst_topology(struct dc_link *link)
{
DC_LOGGER_INIT(link->ctx->logger);
LINK_INFO("link=%d, mst branch is now Disconnected\n",
link->link_index);
revert_dpia_mst_dsc_always_on_wa(link);
return dm_helpers_dp_mst_stop_top_mgr(link->ctx, link);
}
static bool should_prepare_phy_clocks_for_link_verification(const struct dc *dc,
enum dc_detect_reason reason)
{
int i;
bool can_apply_seamless_boot = false;
for (i = 0; i < dc->current_state->stream_count; i++) {
if (dc->current_state->streams[i]->apply_seamless_boot_optimization) {
can_apply_seamless_boot = true;
break;
}
}
return !can_apply_seamless_boot && reason != DETECT_REASON_BOOT;
}
static void prepare_phy_clocks_for_destructive_link_verification(const struct dc *dc)
{
dc_z10_restore(dc);
clk_mgr_exit_optimized_pwr_state(dc, dc->clk_mgr);
}
static void restore_phy_clocks_for_destructive_link_verification(const struct dc *dc)
{
clk_mgr_optimize_pwr_state(dc, dc->clk_mgr);
}
static void verify_link_capability_destructive(struct dc_link *link,
struct dc_sink *sink,
enum dc_detect_reason reason)
{
bool should_prepare_phy_clocks =
should_prepare_phy_clocks_for_link_verification(link->dc, reason);
if (should_prepare_phy_clocks)
prepare_phy_clocks_for_destructive_link_verification(link->dc);
if (dc_is_dp_signal(link->local_sink->sink_signal)) {
struct dc_link_settings known_limit_link_setting =
dp_get_max_link_cap(link);
link_set_all_streams_dpms_off_for_link(link);
dp_verify_link_cap_with_retries(
link, &known_limit_link_setting,
LINK_TRAINING_MAX_VERIFY_RETRY);
} else {
ASSERT(0);
}
if (should_prepare_phy_clocks)
restore_phy_clocks_for_destructive_link_verification(link->dc);
}
static void verify_link_capability_non_destructive(struct dc_link *link)
{
if (dc_is_dp_signal(link->local_sink->sink_signal)) {
if (dc_is_embedded_signal(link->local_sink->sink_signal) ||
link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA)
/* TODO - should we check link encoder's max link caps here?
* How do we know which link encoder to check from?
*/
link->verified_link_cap = link->reported_link_cap;
else
link->verified_link_cap = dp_get_max_link_cap(link);
}
}
static bool should_verify_link_capability_destructively(struct dc_link *link,
enum dc_detect_reason reason)
{
bool destrictive = false;
struct dc_link_settings max_link_cap;
bool is_link_enc_unavailable = link->link_enc &&
link->dc->res_pool->funcs->link_encs_assign &&
!link_enc_cfg_is_link_enc_avail(
link->ctx->dc,
link->link_enc->preferred_engine,
link);
if (dc_is_dp_signal(link->local_sink->sink_signal)) {
max_link_cap = dp_get_max_link_cap(link);
destrictive = true;
if (link->dc->debug.skip_detection_link_training ||
dc_is_embedded_signal(link->local_sink->sink_signal) ||
link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA) {
destrictive = false;
} else if (link_dp_get_encoding_format(&max_link_cap) ==
DP_8b_10b_ENCODING) {
if (link->dpcd_caps.is_mst_capable ||
is_link_enc_unavailable) {
destrictive = false;
}
}
}
return destrictive;
}
static void verify_link_capability(struct dc_link *link, struct dc_sink *sink,
enum dc_detect_reason reason)
{
if (should_verify_link_capability_destructively(link, reason))
verify_link_capability_destructive(link, sink, reason);
else
verify_link_capability_non_destructive(link);
}
/*
* detect_link_and_local_sink() - Detect if a sink is attached to a given link
*
* link->local_sink is created or destroyed as needed.
*
* This does not create remote sinks.
*/
static bool detect_link_and_local_sink(struct dc_link *link,
enum dc_detect_reason reason)
{
struct dc_sink_init_data sink_init_data = { 0 };
struct display_sink_capability sink_caps = { 0 };
uint32_t i;
bool converter_disable_audio = false;
struct audio_support *aud_support = &link->dc->res_pool->audio_support;
bool same_edid = false;
enum dc_edid_status edid_status;
struct dc_context *dc_ctx = link->ctx;
struct dc *dc = dc_ctx->dc;
struct dc_sink *sink = NULL;
struct dc_sink *prev_sink = NULL;
struct dpcd_caps prev_dpcd_caps;
enum dc_connection_type new_connection_type = dc_connection_none;
const uint32_t post_oui_delay = 30; // 30ms
DC_LOGGER_INIT(link->ctx->logger);
if (dc_is_virtual_signal(link->connector_signal))
return false;
if (((link->connector_signal == SIGNAL_TYPE_LVDS ||
link->connector_signal == SIGNAL_TYPE_EDP) &&
(!link->dc->config.allow_edp_hotplug_detection)) &&
link->local_sink) {
// need to re-write OUI and brightness in resume case
if (link->connector_signal == SIGNAL_TYPE_EDP &&
(link->dpcd_sink_ext_caps.bits.oled == 1)) {
dpcd_set_source_specific_data(link);
msleep(post_oui_delay);
set_default_brightness_aux(link);
}
return true;
}
if (!link_detect_connection_type(link, &new_connection_type)) {
BREAK_TO_DEBUGGER();
return false;
}
prev_sink = link->local_sink;
if (prev_sink) {
dc_sink_retain(prev_sink);
memcpy(&prev_dpcd_caps, &link->dpcd_caps, sizeof(struct dpcd_caps));
}
link_disconnect_sink(link);
if (new_connection_type != dc_connection_none) {
link->type = new_connection_type;
link->link_state_valid = false;
/* From Disconnected-to-Connected. */
switch (link->connector_signal) {
case SIGNAL_TYPE_HDMI_TYPE_A: {
sink_caps.transaction_type = DDC_TRANSACTION_TYPE_I2C;
if (aud_support->hdmi_audio_native)
sink_caps.signal = SIGNAL_TYPE_HDMI_TYPE_A;
else
sink_caps.signal = SIGNAL_TYPE_DVI_SINGLE_LINK;
break;
}
case SIGNAL_TYPE_DVI_SINGLE_LINK: {
sink_caps.transaction_type = DDC_TRANSACTION_TYPE_I2C;
sink_caps.signal = SIGNAL_TYPE_DVI_SINGLE_LINK;
break;
}
case SIGNAL_TYPE_DVI_DUAL_LINK: {
sink_caps.transaction_type = DDC_TRANSACTION_TYPE_I2C;
sink_caps.signal = SIGNAL_TYPE_DVI_DUAL_LINK;
break;
}
case SIGNAL_TYPE_LVDS: {
sink_caps.transaction_type = DDC_TRANSACTION_TYPE_I2C;
sink_caps.signal = SIGNAL_TYPE_LVDS;
break;
}
case SIGNAL_TYPE_EDP: {
detect_edp_sink_caps(link);
read_current_link_settings_on_detect(link);
/* Disable power sequence on MIPI panel + converter
*/
if (dc->config.enable_mipi_converter_optimization &&
dc_ctx->dce_version == DCN_VERSION_3_01 &&
link->dpcd_caps.sink_dev_id == DP_BRANCH_DEVICE_ID_0022B9 &&
memcmp(&link->dpcd_caps.branch_dev_name, DP_SINK_BRANCH_DEV_NAME_7580,
sizeof(link->dpcd_caps.branch_dev_name)) == 0) {
dc->config.edp_no_power_sequencing = true;
if (!link->dpcd_caps.set_power_state_capable_edp)
link->wa_flags.dp_keep_receiver_powered = true;
}
sink_caps.transaction_type = DDC_TRANSACTION_TYPE_I2C_OVER_AUX;
sink_caps.signal = SIGNAL_TYPE_EDP;
break;
}
case SIGNAL_TYPE_DISPLAY_PORT: {
/* wa HPD high coming too early*/
if (link->ep_type == DISPLAY_ENDPOINT_PHY &&
link->link_enc->features.flags.bits.DP_IS_USB_C == 1) {
/* if alt mode times out, return false */
if (!wait_for_entering_dp_alt_mode(link))
return false;
}
if (!detect_dp(link, &sink_caps, reason)) {
if (prev_sink)
dc_sink_release(prev_sink);
return false;
}
/* Active SST downstream branch device unplug*/
if (link->type == dc_connection_sst_branch &&
link->dpcd_caps.sink_count.bits.SINK_COUNT == 0) {
if (prev_sink)
/* Downstream unplug */
dc_sink_release(prev_sink);
return true;
}
/* disable audio for non DP to HDMI active sst converter */
if (link->type == dc_connection_sst_branch &&
is_dp_active_dongle(link) &&
(link->dpcd_caps.dongle_type !=
DISPLAY_DONGLE_DP_HDMI_CONVERTER))
converter_disable_audio = true;
/* limited link rate to HBR3 for DPIA until we implement USB4 V2 */
if (link->ep_type == DISPLAY_ENDPOINT_USB4_DPIA &&
link->reported_link_cap.link_rate > LINK_RATE_HIGH3)
link->reported_link_cap.link_rate = LINK_RATE_HIGH3;
/*
* If this is DP over USB4 link then we need to:
* - Enable BW ALLOC support on DPtx if applicable
*/
if (dc->config.usb4_bw_alloc_support) {
if (link_dp_dpia_set_dptx_usb4_bw_alloc_support(link)) {
/* update with non reduced link cap if bw allocation mode is supported */
if (link->dpia_bw_alloc_config.nrd_max_link_rate &&
link->dpia_bw_alloc_config.nrd_max_lane_count) {
link->reported_link_cap.link_rate =
link->dpia_bw_alloc_config.nrd_max_link_rate;
link->reported_link_cap.lane_count =
link->dpia_bw_alloc_config.nrd_max_lane_count;
}
}
}
break;
}
default:
DC_ERROR("Invalid connector type! signal:%d\n",
link->connector_signal);
if (prev_sink)
dc_sink_release(prev_sink);
return false;
} /* switch() */
if (link->dpcd_caps.sink_count.bits.SINK_COUNT)
link->dpcd_sink_count =
link->dpcd_caps.sink_count.bits.SINK_COUNT;
else
link->dpcd_sink_count = 1;
set_ddc_transaction_type(link->ddc,
sink_caps.transaction_type);
link->aux_mode =
link_is_in_aux_transaction_mode(link->ddc);
sink_init_data.link = link;
sink_init_data.sink_signal = sink_caps.signal;
sink = dc_sink_create(&sink_init_data);
if (!sink) {
DC_ERROR("Failed to create sink!\n");
if (prev_sink)
dc_sink_release(prev_sink);
return false;
}
sink->link->dongle_max_pix_clk = sink_caps.max_hdmi_pixel_clock;
sink->converter_disable_audio = converter_disable_audio;
/* dc_sink_create returns a new reference */
link->local_sink = sink;
edid_status = dm_helpers_read_local_edid(link->ctx,
link, sink);
switch (edid_status) {
case EDID_BAD_CHECKSUM:
DC_LOG_ERROR("EDID checksum invalid.\n");
break;
case EDID_PARTIAL_VALID:
DC_LOG_ERROR("Partial EDID valid, abandon invalid blocks.\n");
break;
case EDID_NO_RESPONSE:
DC_LOG_ERROR("No EDID read.\n");
/*
* Abort detection for non-DP connectors if we have
* no EDID
*
* DP needs to report as connected if HDP is high
* even if we have no EDID in order to go to
* fail-safe mode
*/
if (dc_is_hdmi_signal(link->connector_signal) ||
dc_is_dvi_signal(link->connector_signal)) {
if (prev_sink)
dc_sink_release(prev_sink);
return false;
}
if (link->type == dc_connection_sst_branch &&
link->dpcd_caps.dongle_type ==
DISPLAY_DONGLE_DP_VGA_CONVERTER &&
reason == DETECT_REASON_HPDRX) {
/* Abort detection for DP-VGA adapters when EDID
* can't be read and detection reason is VGA-side
* hotplug
*/
if (prev_sink)
dc_sink_release(prev_sink);
link_disconnect_sink(link);
return true;
}
break;
default:
break;
}
// Check if edid is the same
if ((prev_sink) &&
(edid_status == EDID_THE_SAME || edid_status == EDID_OK))
same_edid = is_same_edid(&prev_sink->dc_edid,
&sink->dc_edid);
if (sink->edid_caps.panel_patch.skip_scdc_overwrite)
link->ctx->dc->debug.hdmi20_disable = true;
if (sink->edid_caps.panel_patch.remove_sink_ext_caps)
link->dpcd_sink_ext_caps.raw = 0;
if (dc_is_hdmi_signal(link->connector_signal))
read_scdc_caps(link->ddc, link->local_sink);
if (link->connector_signal == SIGNAL_TYPE_DISPLAY_PORT &&
sink_caps.transaction_type ==
DDC_TRANSACTION_TYPE_I2C_OVER_AUX) {
/*
* TODO debug why certain monitors don't like
* two link trainings
*/
query_hdcp_capability(sink->sink_signal, link);
} else {
// If edid is the same, then discard new sink and revert back to original sink
if (same_edid) {
link_disconnect_remap(prev_sink, link);
sink = prev_sink;
prev_sink = NULL;
}
query_hdcp_capability(sink->sink_signal, link);
}
/* HDMI-DVI Dongle */
if (sink->sink_signal == SIGNAL_TYPE_HDMI_TYPE_A &&
!sink->edid_caps.edid_hdmi)
sink->sink_signal = SIGNAL_TYPE_DVI_SINGLE_LINK;
if (link->local_sink && dc_is_dp_signal(sink_caps.signal))
dp_trace_init(link);
/* Connectivity log: detection */
for (i = 0; i < sink->dc_edid.length / DC_EDID_BLOCK_SIZE; i++) {
CONN_DATA_DETECT(link,
&sink->dc_edid.raw_edid[i * DC_EDID_BLOCK_SIZE],
DC_EDID_BLOCK_SIZE,
"%s: [Block %d] ", sink->edid_caps.display_name, i);
}
DC_LOG_DETECTION_EDID_PARSER("%s: "
"manufacturer_id = %X, "
"product_id = %X, "
"serial_number = %X, "
"manufacture_week = %d, "
"manufacture_year = %d, "
"display_name = %s, "
"speaker_flag = %d, "
"audio_mode_count = %d\n",
__func__,
sink->edid_caps.manufacturer_id,
sink->edid_caps.product_id,
sink->edid_caps.serial_number,
sink->edid_caps.manufacture_week,
sink->edid_caps.manufacture_year,
sink->edid_caps.display_name,
sink->edid_caps.speaker_flags,
sink->edid_caps.audio_mode_count);
for (i = 0; i < sink->edid_caps.audio_mode_count; i++) {
DC_LOG_DETECTION_EDID_PARSER("%s: mode number = %d, "
"format_code = %d, "
"channel_count = %d, "
"sample_rate = %d, "
"sample_size = %d\n",
__func__,
i,
sink->edid_caps.audio_modes[i].format_code,
sink->edid_caps.audio_modes[i].channel_count,
sink->edid_caps.audio_modes[i].sample_rate,
sink->edid_caps.audio_modes[i].sample_size);
}
if (link->connector_signal == SIGNAL_TYPE_EDP) {
// Init dc_panel_config by HW config
if (dc_ctx->dc->res_pool->funcs->get_panel_config_defaults)
dc_ctx->dc->res_pool->funcs->get_panel_config_defaults(&link->panel_config);
// Pickup base DM settings
dm_helpers_init_panel_settings(dc_ctx, &link->panel_config, sink);
// Override dc_panel_config if system has specific settings
dm_helpers_override_panel_settings(dc_ctx, &link->panel_config);
//sink only can use supported link rate table, we are foreced to enable it
if (link->reported_link_cap.link_rate == LINK_RATE_UNKNOWN)
link->panel_config.ilr.optimize_edp_link_rate = true;
link->reported_link_cap.link_rate = get_max_edp_link_rate(link);
}
} else {
/* From Connected-to-Disconnected. */
link->type = dc_connection_none;
sink_caps.signal = SIGNAL_TYPE_NONE;
memset(&link->hdcp_caps, 0, sizeof(struct hdcp_caps));
/* When we unplug a passive DP-HDMI dongle connection, dongle_max_pix_clk
* is not cleared. If we emulate a DP signal on this connection, it thinks
* the dongle is still there and limits the number of modes we can emulate.
* Clear dongle_max_pix_clk on disconnect to fix this
*/
link->dongle_max_pix_clk = 0;
dc_link_clear_dprx_states(link);
dp_trace_reset(link);
}
LINK_INFO("link=%d, dc_sink_in=%p is now %s prev_sink=%p edid same=%d\n",
link->link_index, sink,
(sink_caps.signal ==
SIGNAL_TYPE_NONE ? "Disconnected" : "Connected"),
prev_sink, same_edid);
if (prev_sink)
dc_sink_release(prev_sink);
return true;
}
/*
* link_detect_connection_type() - Determine if there is a sink connected
*
* @type: Returned connection type
* Does not detect downstream devices, such as MST sinks
* or display connected through active dongles
*/
bool link_detect_connection_type(struct dc_link *link, enum dc_connection_type *type)
{
uint32_t is_hpd_high = 0;
if (link->connector_signal == SIGNAL_TYPE_LVDS) {
*type = dc_connection_single;
return true;
}
if (link->connector_signal == SIGNAL_TYPE_EDP) {
/*in case it is not on*/
if (!link->dc->config.edp_no_power_sequencing)
link->dc->hwss.edp_power_control(link, true);
link->dc->hwss.edp_wait_for_hpd_ready(link, true);
}
/* Link may not have physical HPD pin. */
if (link->ep_type != DISPLAY_ENDPOINT_PHY) {
if (link->is_hpd_pending || !dpia_query_hpd_status(link))
*type = dc_connection_none;
else
*type = dc_connection_single;
return true;
}
if (!query_hpd_status(link, &is_hpd_high))
goto hpd_gpio_failure;
if (is_hpd_high) {
*type = dc_connection_single;
/* TODO: need to do the actual detection */
} else {
*type = dc_connection_none;
if (link->connector_signal == SIGNAL_TYPE_EDP) {
/* eDP is not connected, power down it */
if (!link->dc->config.edp_no_power_sequencing)
link->dc->hwss.edp_power_control(link, false);
}
}
return true;
hpd_gpio_failure:
return false;
}
bool link_detect(struct dc_link *link, enum dc_detect_reason reason)
{
bool is_local_sink_detect_success;
bool is_delegated_to_mst_top_mgr = false;
enum dc_connection_type pre_link_type = link->type;
DC_LOGGER_INIT(link->ctx->logger);
is_local_sink_detect_success = detect_link_and_local_sink(link, reason);
if (is_local_sink_detect_success && link->local_sink)
verify_link_capability(link, link->local_sink, reason);
DC_LOG_DC("%s: link_index=%d is_local_sink_detect_success=%d pre_link_type=%d link_type=%d\n", __func__,
link->link_index, is_local_sink_detect_success, pre_link_type, link->type);
if (is_local_sink_detect_success && link->local_sink &&
dc_is_dp_signal(link->local_sink->sink_signal) &&
link->dpcd_caps.is_mst_capable)
is_delegated_to_mst_top_mgr = discover_dp_mst_topology(link, reason);
if (pre_link_type == dc_connection_mst_branch &&
link->type != dc_connection_mst_branch)
is_delegated_to_mst_top_mgr = link_reset_cur_dp_mst_topology(link);
return is_local_sink_detect_success && !is_delegated_to_mst_top_mgr;
}
void link_clear_dprx_states(struct dc_link *link)
{
memset(&link->dprx_states, 0, sizeof(link->dprx_states));
}
bool link_is_hdcp14(struct dc_link *link, enum signal_type signal)
{
bool ret = false;
switch (signal) {
case SIGNAL_TYPE_DISPLAY_PORT:
case SIGNAL_TYPE_DISPLAY_PORT_MST:
ret = link->hdcp_caps.bcaps.bits.HDCP_CAPABLE;
break;
case SIGNAL_TYPE_DVI_SINGLE_LINK:
case SIGNAL_TYPE_DVI_DUAL_LINK:
case SIGNAL_TYPE_HDMI_TYPE_A:
/* HDMI doesn't tell us its HDCP(1.4) capability, so assume to always be capable,
* we can poll for bksv but some displays have an issue with this. Since its so rare
* for a display to not be 1.4 capable, this assumtion is ok
*/
ret = true;
break;
default:
break;
}
return ret;
}
bool link_is_hdcp22(struct dc_link *link, enum signal_type signal)
{
bool ret = false;
switch (signal) {
case SIGNAL_TYPE_DISPLAY_PORT:
case SIGNAL_TYPE_DISPLAY_PORT_MST:
ret = (link->hdcp_caps.bcaps.bits.HDCP_CAPABLE &&
link->hdcp_caps.rx_caps.fields.byte0.hdcp_capable &&
(link->hdcp_caps.rx_caps.fields.version == 0x2)) ? 1 : 0;
break;
case SIGNAL_TYPE_DVI_SINGLE_LINK:
case SIGNAL_TYPE_DVI_DUAL_LINK:
case SIGNAL_TYPE_HDMI_TYPE_A:
ret = (link->hdcp_caps.rx_caps.fields.version == 0x4) ? 1:0;
break;
default:
break;
}
return ret;
}
const struct dc_link_status *link_get_status(const struct dc_link *link)
{
return &link->link_status;
}
static bool link_add_remote_sink_helper(struct dc_link *dc_link, struct dc_sink *sink)
{
if (dc_link->sink_count >= MAX_SINKS_PER_LINK) {
BREAK_TO_DEBUGGER();
return false;
}
dc_sink_retain(sink);
dc_link->remote_sinks[dc_link->sink_count] = sink;
dc_link->sink_count++;
return true;
}
struct dc_sink *link_add_remote_sink(
struct dc_link *link,
const uint8_t *edid,
int len,
struct dc_sink_init_data *init_data)
{
struct dc_sink *dc_sink;
enum dc_edid_status edid_status;
if (len > DC_MAX_EDID_BUFFER_SIZE) {
dm_error("Max EDID buffer size breached!\n");
return NULL;
}
if (!init_data) {
BREAK_TO_DEBUGGER();
return NULL;
}
if (!init_data->link) {
BREAK_TO_DEBUGGER();
return NULL;
}
dc_sink = dc_sink_create(init_data);
if (!dc_sink)
return NULL;
memmove(dc_sink->dc_edid.raw_edid, edid, len);
dc_sink->dc_edid.length = len;
if (!link_add_remote_sink_helper(
link,
dc_sink))
goto fail_add_sink;
edid_status = dm_helpers_parse_edid_caps(
link,
&dc_sink->dc_edid,
&dc_sink->edid_caps);
/*
* Treat device as no EDID device if EDID
* parsing fails
*/
if (edid_status != EDID_OK && edid_status != EDID_PARTIAL_VALID) {
dc_sink->dc_edid.length = 0;
dm_error("Bad EDID, status%d!\n", edid_status);
}
return dc_sink;
fail_add_sink:
dc_sink_release(dc_sink);
return NULL;
}
void link_remove_remote_sink(struct dc_link *link, struct dc_sink *sink)
{
int i;
if (!link->sink_count) {
BREAK_TO_DEBUGGER();
return;
}
for (i = 0; i < link->sink_count; i++) {
if (link->remote_sinks[i] == sink) {
dc_sink_release(sink);
link->remote_sinks[i] = NULL;
/* shrink array to remove empty place */
while (i < link->sink_count - 1) {
link->remote_sinks[i] = link->remote_sinks[i+1];
i++;
}
link->remote_sinks[i] = NULL;
link->sink_count--;
return;
}
}
}
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