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/*
* Copyright (c) 2014,2017 Qualcomm Atheros, Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "wil6210.h"
#include <linux/jiffies.h>
#include <linux/pm_runtime.h>
#define WIL6210_AUTOSUSPEND_DELAY_MS (1000)
int wil_can_suspend(struct wil6210_priv *wil, bool is_runtime)
{
int rc = 0;
struct wireless_dev *wdev = wil->wdev;
struct net_device *ndev = wil_to_ndev(wil);
bool wmi_only = test_bit(WMI_FW_CAPABILITY_WMI_ONLY,
wil->fw_capabilities);
wil_dbg_pm(wil, "can_suspend: %s\n", is_runtime ? "runtime" : "system");
if (wmi_only || debug_fw) {
wil_dbg_pm(wil, "Deny any suspend - %s mode\n",
wmi_only ? "wmi_only" : "debug_fw");
rc = -EBUSY;
goto out;
}
if (is_runtime && !wil->platform_ops.suspend) {
rc = -EBUSY;
goto out;
}
if (!(ndev->flags & IFF_UP)) {
/* can always sleep when down */
wil_dbg_pm(wil, "Interface is down\n");
goto out;
}
if (test_bit(wil_status_resetting, wil->status)) {
wil_dbg_pm(wil, "Delay suspend when resetting\n");
rc = -EBUSY;
goto out;
}
if (wil->recovery_state != fw_recovery_idle) {
wil_dbg_pm(wil, "Delay suspend during recovery\n");
rc = -EBUSY;
goto out;
}
/* interface is running */
switch (wdev->iftype) {
case NL80211_IFTYPE_MONITOR:
wil_dbg_pm(wil, "Sniffer\n");
rc = -EBUSY;
goto out;
/* for STA-like interface, don't runtime suspend */
case NL80211_IFTYPE_STATION:
case NL80211_IFTYPE_P2P_CLIENT:
if (test_bit(wil_status_fwconnecting, wil->status)) {
wil_dbg_pm(wil, "Delay suspend when connecting\n");
rc = -EBUSY;
goto out;
}
/* Runtime pm not supported in case the interface is up */
if (is_runtime) {
wil_dbg_pm(wil, "STA-like interface\n");
rc = -EBUSY;
goto out;
}
break;
/* AP-like interface - can't suspend */
default:
wil_dbg_pm(wil, "AP-like interface\n");
rc = -EBUSY;
break;
}
out:
wil_dbg_pm(wil, "can_suspend: %s => %s (%d)\n",
is_runtime ? "runtime" : "system", rc ? "No" : "Yes", rc);
if (rc)
wil->suspend_stats.rejected_by_host++;
return rc;
}
static int wil_resume_keep_radio_on(struct wil6210_priv *wil)
{
int rc = 0;
/* wil_status_resuming will be cleared when getting
* WMI_TRAFFIC_RESUME_EVENTID
*/
set_bit(wil_status_resuming, wil->status);
clear_bit(wil_status_suspended, wil->status);
wil_c(wil, RGF_USER_CLKS_CTL_0, BIT_USER_CLKS_RST_PWGD);
wil_unmask_irq(wil);
wil6210_bus_request(wil, wil->bus_request_kbps_pre_suspend);
/* Send WMI resume request to the device */
rc = wmi_resume(wil);
if (rc) {
wil_err(wil, "device failed to resume (%d)\n", rc);
if (no_fw_recovery)
goto out;
rc = wil_down(wil);
if (rc) {
wil_err(wil, "wil_down failed (%d)\n", rc);
goto out;
}
rc = wil_up(wil);
if (rc) {
wil_err(wil, "wil_up failed (%d)\n", rc);
goto out;
}
}
/* Wake all queues */
if (test_bit(wil_status_fwconnected, wil->status))
wil_update_net_queues_bh(wil, NULL, false);
out:
if (rc)
set_bit(wil_status_suspended, wil->status);
return rc;
}
static int wil_suspend_keep_radio_on(struct wil6210_priv *wil)
{
int rc = 0;
unsigned long start, data_comp_to;
wil_dbg_pm(wil, "suspend keep radio on\n");
/* Prevent handling of new tx and wmi commands */
set_bit(wil_status_suspending, wil->status);
if (test_bit(wil_status_collecting_dumps, wil->status)) {
/* Device collects crash dump, cancel the suspend */
wil_dbg_pm(wil, "reject suspend while collecting crash dump\n");
clear_bit(wil_status_suspending, wil->status);
wil->suspend_stats.rejected_by_host++;
return -EBUSY;
}
wil_update_net_queues_bh(wil, NULL, true);
if (!wil_is_tx_idle(wil)) {
wil_dbg_pm(wil, "Pending TX data, reject suspend\n");
wil->suspend_stats.rejected_by_host++;
goto reject_suspend;
}
if (!wil_is_rx_idle(wil)) {
wil_dbg_pm(wil, "Pending RX data, reject suspend\n");
wil->suspend_stats.rejected_by_host++;
goto reject_suspend;
}
if (!wil_is_wmi_idle(wil)) {
wil_dbg_pm(wil, "Pending WMI events, reject suspend\n");
wil->suspend_stats.rejected_by_host++;
goto reject_suspend;
}
/* Send WMI suspend request to the device */
rc = wmi_suspend(wil);
if (rc) {
wil_dbg_pm(wil, "wmi_suspend failed, reject suspend (%d)\n",
rc);
goto reject_suspend;
}
/* Wait for completion of the pending RX packets */
start = jiffies;
data_comp_to = jiffies + msecs_to_jiffies(WIL_DATA_COMPLETION_TO_MS);
if (test_bit(wil_status_napi_en, wil->status)) {
while (!wil_is_rx_idle(wil)) {
if (time_after(jiffies, data_comp_to)) {
if (wil_is_rx_idle(wil))
break;
wil_err(wil,
"TO waiting for idle RX, suspend failed\n");
wil->suspend_stats.r_on.failed_suspends++;
goto resume_after_fail;
}
wil_dbg_ratelimited(wil, "rx vring is not empty -> NAPI\n");
napi_synchronize(&wil->napi_rx);
msleep(20);
}
}
/* In case of pending WMI events, reject the suspend
* and resume the device.
* This can happen if the device sent the WMI events before
* approving the suspend.
*/
if (!wil_is_wmi_idle(wil)) {
wil_err(wil, "suspend failed due to pending WMI events\n");
wil->suspend_stats.r_on.failed_suspends++;
goto resume_after_fail;
}
wil_mask_irq(wil);
/* Disable device reset on PERST */
wil_s(wil, RGF_USER_CLKS_CTL_0, BIT_USER_CLKS_RST_PWGD);
if (wil->platform_ops.suspend) {
rc = wil->platform_ops.suspend(wil->platform_handle, true);
if (rc) {
wil_err(wil, "platform device failed to suspend (%d)\n",
rc);
wil->suspend_stats.r_on.failed_suspends++;
wil_c(wil, RGF_USER_CLKS_CTL_0, BIT_USER_CLKS_RST_PWGD);
wil_unmask_irq(wil);
goto resume_after_fail;
}
}
/* Save the current bus request to return to the same in resume */
wil->bus_request_kbps_pre_suspend = wil->bus_request_kbps;
wil6210_bus_request(wil, 0);
set_bit(wil_status_suspended, wil->status);
clear_bit(wil_status_suspending, wil->status);
return rc;
resume_after_fail:
set_bit(wil_status_resuming, wil->status);
clear_bit(wil_status_suspending, wil->status);
rc = wmi_resume(wil);
/* if resume succeeded, reject the suspend */
if (!rc) {
rc = -EBUSY;
if (test_bit(wil_status_fwconnected, wil->status))
wil_update_net_queues_bh(wil, NULL, false);
}
return rc;
reject_suspend:
clear_bit(wil_status_suspending, wil->status);
if (test_bit(wil_status_fwconnected, wil->status))
wil_update_net_queues_bh(wil, NULL, false);
return -EBUSY;
}
static int wil_suspend_radio_off(struct wil6210_priv *wil)
{
int rc = 0;
struct net_device *ndev = wil_to_ndev(wil);
wil_dbg_pm(wil, "suspend radio off\n");
set_bit(wil_status_suspending, wil->status);
if (test_bit(wil_status_collecting_dumps, wil->status)) {
/* Device collects crash dump, cancel the suspend */
wil_dbg_pm(wil, "reject suspend while collecting crash dump\n");
clear_bit(wil_status_suspending, wil->status);
wil->suspend_stats.rejected_by_host++;
return -EBUSY;
}
/* if netif up, hardware is alive, shut it down */
if (ndev->flags & IFF_UP) {
rc = wil_down(wil);
if (rc) {
wil_err(wil, "wil_down : %d\n", rc);
wil->suspend_stats.r_off.failed_suspends++;
goto out;
}
}
/* Disable PCIe IRQ to prevent sporadic IRQs when PCIe is suspending */
wil_dbg_pm(wil, "Disabling PCIe IRQ before suspending\n");
wil_disable_irq(wil);
if (wil->platform_ops.suspend) {
rc = wil->platform_ops.suspend(wil->platform_handle, false);
if (rc) {
wil_enable_irq(wil);
wil->suspend_stats.r_off.failed_suspends++;
goto out;
}
}
set_bit(wil_status_suspended, wil->status);
out:
clear_bit(wil_status_suspending, wil->status);
wil_dbg_pm(wil, "suspend radio off: %d\n", rc);
return rc;
}
static int wil_resume_radio_off(struct wil6210_priv *wil)
{
int rc = 0;
struct net_device *ndev = wil_to_ndev(wil);
wil_dbg_pm(wil, "Enabling PCIe IRQ\n");
wil_enable_irq(wil);
/* if netif up, bring hardware up
* During open(), IFF_UP set after actual device method
* invocation. This prevent recursive call to wil_up()
* wil_status_suspended will be cleared in wil_reset
*/
if (ndev->flags & IFF_UP)
rc = wil_up(wil);
else
clear_bit(wil_status_suspended, wil->status);
return rc;
}
int wil_suspend(struct wil6210_priv *wil, bool is_runtime, bool keep_radio_on)
{
int rc = 0;
wil_dbg_pm(wil, "suspend: %s\n", is_runtime ? "runtime" : "system");
if (test_bit(wil_status_suspended, wil->status)) {
wil_dbg_pm(wil, "trying to suspend while suspended\n");
return 0;
}
if (!keep_radio_on)
rc = wil_suspend_radio_off(wil);
else
rc = wil_suspend_keep_radio_on(wil);
wil_dbg_pm(wil, "suspend: %s => %d\n",
is_runtime ? "runtime" : "system", rc);
return rc;
}
int wil_resume(struct wil6210_priv *wil, bool is_runtime, bool keep_radio_on)
{
int rc = 0;
wil_dbg_pm(wil, "resume: %s\n", is_runtime ? "runtime" : "system");
if (wil->platform_ops.resume) {
rc = wil->platform_ops.resume(wil->platform_handle,
keep_radio_on);
if (rc) {
wil_err(wil, "platform_ops.resume : %d\n", rc);
goto out;
}
}
if (keep_radio_on)
rc = wil_resume_keep_radio_on(wil);
else
rc = wil_resume_radio_off(wil);
out:
wil_dbg_pm(wil, "resume: %s => %d\n", is_runtime ? "runtime" : "system",
rc);
return rc;
}
void wil_pm_runtime_allow(struct wil6210_priv *wil)
{
struct device *dev = wil_to_dev(wil);
pm_runtime_put_noidle(dev);
pm_runtime_set_autosuspend_delay(dev, WIL6210_AUTOSUSPEND_DELAY_MS);
pm_runtime_use_autosuspend(dev);
pm_runtime_allow(dev);
}
void wil_pm_runtime_forbid(struct wil6210_priv *wil)
{
struct device *dev = wil_to_dev(wil);
pm_runtime_forbid(dev);
pm_runtime_get_noresume(dev);
}
int wil_pm_runtime_get(struct wil6210_priv *wil)
{
int rc;
struct device *dev = wil_to_dev(wil);
rc = pm_runtime_get_sync(dev);
if (rc < 0) {
wil_err(wil, "pm_runtime_get_sync() failed, rc = %d\n", rc);
pm_runtime_put_noidle(dev);
return rc;
}
return 0;
}
void wil_pm_runtime_put(struct wil6210_priv *wil)
{
struct device *dev = wil_to_dev(wil);
pm_runtime_mark_last_busy(dev);
pm_runtime_put_autosuspend(dev);
}
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