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https://github.com/Telecominfraproject/OpenCellular.git
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d7c19b0236
Add a retry mechanism for EC to PD host commands to make the communication channel more robust. BUG=none BRANCH=none TEST=run on system to verify that we don't drop host commands to PD MCU. Change-Id: Ida6f02a149e4dd9e85a5aac21790928b16864104 Signed-off-by: Alec Berg <alecaberg@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/205148 Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
82 lines
1.9 KiB
C
82 lines
1.9 KiB
C
/* Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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/* Host command module for PD MCU */
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#include "charge_state.h"
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#include "common.h"
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#include "console.h"
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#include "host_command.h"
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#include "task.h"
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#include "timer.h"
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#include "util.h"
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#define CPRINTS(format, args...) cprints(CC_PD_HOST_CMD, format, ## args)
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#define TASK_EVENT_EXCHANGE_PD_STATUS TASK_EVENT_CUSTOM(1)
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static int pd_charger_connected;
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void host_command_pd_send_status(void)
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{
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task_set_event(TASK_ID_PDCMD, TASK_EVENT_EXCHANGE_PD_STATUS, 0);
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}
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static void pd_exchange_status(void)
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{
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struct ec_params_pd_status ec_status;
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struct ec_response_pd_status pd_status;
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int rv = 0, tries = 0;
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/*
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* TODO(crosbug.com/p/29499): Change sending state of charge to
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* remaining capacity for finer grained control.
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*/
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/* Send battery state of charge */
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if (charge_get_flags() & CHARGE_FLAG_BATT_RESPONSIVE)
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ec_status.batt_soc = charge_get_percent();
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else
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ec_status.batt_soc = -1;
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/* Try 3 times to get the PD MCU status. */
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while (tries++ < 3) {
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rv = pd_host_command(EC_CMD_PD_EXCHANGE_STATUS, 0, &ec_status,
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sizeof(struct ec_params_pd_status), &pd_status,
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sizeof(struct ec_response_pd_status));
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if (rv >= 0)
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break;
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task_wait_event(500*MSEC);
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}
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if (rv >= 0)
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pd_charger_connected = pd_status.status &
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EC_CMD_PD_STATUS_FLAG_CHARGER_CONN;
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else
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CPRINTS("Host command to PD MCU failed");
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}
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/*
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* TODO(crosbug.com/p/29841): remove hack for getting extpower
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* is present status from PD MCU.
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*/
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int pd_extpower_is_present(void)
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{
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return pd_charger_connected;
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}
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void pd_command_task(void)
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{
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while (1) {
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/* Wait for the next command event */
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int evt = task_wait_event(-1);
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/* Process event to send status to PD */
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if (evt & TASK_EVENT_EXCHANGE_PD_STATUS)
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pd_exchange_status();
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}
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}
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