/*
* 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 implements functions that manage basic HPD components such as gpio.
* It also provides wrapper functions to execute HPD related programming. This
* file only manages basic HPD functionality. It doesn't manage detection or
* feature or signal specific HPD behaviors.
*/
#include "link_hpd.h"
#include "gpio_service_interface.h"
bool link_get_hpd_state(struct dc_link *link)
{
uint32_t state = 0;
dal_gpio_lock_pin(link->hpd_gpio);
dal_gpio_get_value(link->hpd_gpio, &state);
dal_gpio_unlock_pin(link->hpd_gpio);
return state;
}
void link_enable_hpd(const struct dc_link *link)
{
struct link_encoder *encoder = link->link_enc;
if (encoder != NULL && encoder->funcs->enable_hpd != NULL)
encoder->funcs->enable_hpd(encoder);
}
void link_disable_hpd(const struct dc_link *link)
{
struct link_encoder *encoder = link->link_enc;
if (encoder != NULL && encoder->funcs->enable_hpd != NULL)
encoder->funcs->disable_hpd(encoder);
}
void link_enable_hpd_filter(struct dc_link *link, bool enable)
{
struct gpio *hpd;
if (enable) {
link->is_hpd_filter_disabled = false;
program_hpd_filter(link);
} else {
link->is_hpd_filter_disabled = true;
/* Obtain HPD handle */
hpd = link_get_hpd_gpio(link->ctx->dc_bios, link->link_id, link->ctx->gpio_service);
if (!hpd)
return;
/* Setup HPD filtering */
if (dal_gpio_open(hpd, GPIO_MODE_INTERRUPT) == GPIO_RESULT_OK) {
struct gpio_hpd_config config;
config.delay_on_connect = 0;
config.delay_on_disconnect = 0;
dal_irq_setup_hpd_filter(hpd, &config);
dal_gpio_close(hpd);
} else {
ASSERT_CRITICAL(false);
}
/* Release HPD handle */
dal_gpio_destroy_irq(&hpd);
}
}
struct gpio *link_get_hpd_gpio(struct dc_bios *dcb,
struct graphics_object_id link_id,
struct gpio_service *gpio_service)
{
enum bp_result bp_result;
struct graphics_object_hpd_info hpd_info;
struct gpio_pin_info pin_info;
if (dcb->funcs->get_hpd_info(dcb, link_id, &hpd_info) != BP_RESULT_OK)
return NULL;
bp_result = dcb->funcs->get_gpio_pin_info(dcb,
hpd_info.hpd_int_gpio_uid, &pin_info);
if (bp_result != BP_RESULT_OK) {
ASSERT(bp_result == BP_RESULT_NORECORD);
return NULL;
}
return dal_gpio_service_create_irq(gpio_service,
pin_info.offset,
pin_info.mask);
}
bool query_hpd_status(struct dc_link *link, uint32_t *is_hpd_high)
{
struct gpio *hpd_pin = link_get_hpd_gpio(
link->ctx->dc_bios, link->link_id,
link->ctx->gpio_service);
if (!hpd_pin)
return false;
dal_gpio_open(hpd_pin, GPIO_MODE_INTERRUPT);
dal_gpio_get_value(hpd_pin, is_hpd_high);
dal_gpio_close(hpd_pin);
dal_gpio_destroy_irq(&hpd_pin);
return true;
}
enum hpd_source_id get_hpd_line(struct dc_link *link)
{
struct gpio *hpd;
enum hpd_source_id hpd_id;
hpd_id = HPD_SOURCEID_UNKNOWN;
hpd = link_get_hpd_gpio(link->ctx->dc_bios, link->link_id,
link->ctx->gpio_service);
if (hpd) {
switch (dal_irq_get_source(hpd)) {
case DC_IRQ_SOURCE_HPD1:
hpd_id = HPD_SOURCEID1;
break;
case DC_IRQ_SOURCE_HPD2:
hpd_id = HPD_SOURCEID2;
break;
case DC_IRQ_SOURCE_HPD3:
hpd_id = HPD_SOURCEID3;
break;
case DC_IRQ_SOURCE_HPD4:
hpd_id = HPD_SOURCEID4;
break;
case DC_IRQ_SOURCE_HPD5:
hpd_id = HPD_SOURCEID5;
break;
case DC_IRQ_SOURCE_HPD6:
hpd_id = HPD_SOURCEID6;
break;
default:
BREAK_TO_DEBUGGER();
break;
}
dal_gpio_destroy_irq(&hpd);
}
return hpd_id;
}
bool program_hpd_filter(const struct dc_link *link)
{
bool result = false;
struct gpio *hpd;
int delay_on_connect_in_ms = 0;
int delay_on_disconnect_in_ms = 0;
if (link->is_hpd_filter_disabled)
return false;
/* Verify feature is supported */
switch (link->connector_signal) {
case SIGNAL_TYPE_DVI_SINGLE_LINK:
case SIGNAL_TYPE_DVI_DUAL_LINK:
case SIGNAL_TYPE_HDMI_TYPE_A:
/* Program hpd filter */
delay_on_connect_in_ms = 500;
delay_on_disconnect_in_ms = 100;
break;
case SIGNAL_TYPE_DISPLAY_PORT:
case SIGNAL_TYPE_DISPLAY_PORT_MST:
/* Program hpd filter to allow DP signal to settle */
/* 500: not able to detect MST <-> SST switch as HPD is low for
* only 100ms on DELL U2413
* 0: some passive dongle still show aux mode instead of i2c
* 20-50: not enough to hide bouncing HPD with passive dongle.
* also see intermittent i2c read issues.
*/
delay_on_connect_in_ms = 80;
delay_on_disconnect_in_ms = 0;
break;
case SIGNAL_TYPE_LVDS:
case SIGNAL_TYPE_EDP:
default:
/* Don't program hpd filter */
return false;
}
/* Obtain HPD handle */
hpd = link_get_hpd_gpio(link->ctx->dc_bios, link->link_id,
link->ctx->gpio_service);
if (!hpd)
return result;
/* Setup HPD filtering */
if (dal_gpio_open(hpd, GPIO_MODE_INTERRUPT) == GPIO_RESULT_OK) {
struct gpio_hpd_config config;
config.delay_on_connect = delay_on_connect_in_ms;
config.delay_on_disconnect = delay_on_disconnect_in_ms;
dal_irq_setup_hpd_filter(hpd, &config);
dal_gpio_close(hpd);
result = true;
} else {
ASSERT_CRITICAL(false);
}
/* Release HPD handle */
dal_gpio_destroy_irq(&hpd);
return result;
}
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