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Bluetooth: btintel_pcie: Support for S4 (Hibernate) 

During S4 (hibernate), the Bluetooth device loses power. Upon resume,
the driver performs the following actions:

1. Unregisters hdev
2. Calls function level reset
3. Registers hdev

Test case:
- run command sudo rtcwake -m disk -s 60

Signed-off-by: Ravindra <ravindra@intel.com>
Signed-off-by: Kiran K <kiran.k@intel.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
This commit is contained in:
Ravindra 2025-10-15 15:09:02 +05:30 committed by Luiz Augusto von Dentz
parent 5a6700a31c
commit 1fb0d830da
2 changed files with 43 additions and 0 deletions
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41
drivers/bluetooth/btintel_pcie.c
View File

@ -825,6 +825,11 @@ static inline bool btintel_pcie_in_d0(struct btintel_pcie_data *data)
return !(data->boot_stage_cache & BTINTEL_PCIE_CSR_BOOT_STAGE_D3_STATE_READY);
}
static inline bool btintel_pcie_in_device_halt(struct btintel_pcie_data *data)
{
return data->boot_stage_cache & BTINTEL_PCIE_CSR_BOOT_STAGE_DEVICE_HALTED;
}
static void btintel_pcie_wr_sleep_cntrl(struct btintel_pcie_data *data,
u32 dxstate)
{
@ -2532,6 +2537,8 @@ static int btintel_pcie_suspend_late(struct device *dev, pm_message_t mesg)
dxstate = (mesg.event == PM_EVENT_SUSPEND ?
BTINTEL_PCIE_STATE_D3_HOT : BTINTEL_PCIE_STATE_D3_COLD);
data->pm_sx_event = mesg.event;
data->gp0_received = false;
start = ktime_get();
@ -2581,6 +2588,20 @@ static int btintel_pcie_resume(struct device *dev)
start = ktime_get();
/* When the system enters S4 (hibernate) mode, bluetooth device loses
* power, which results in the erasure of its loaded firmware.
* Consequently, function level reset (flr) is required on system
* resume to bring the controller back into an operational state by
* initiating a new firmware download.
*/
if (data->pm_sx_event == PM_EVENT_FREEZE ||
data->pm_sx_event == PM_EVENT_HIBERNATE) {
set_bit(BTINTEL_PCIE_CORE_HALTED, &data->flags);
btintel_pcie_reset(data->hdev);
return 0;
}
/* Refer: 6.4.11.7 -> Platform power management */
btintel_pcie_wr_sleep_cntrl(data, BTINTEL_PCIE_STATE_D0);
err = wait_event_timeout(data->gp0_wait_q, data->gp0_received,
@ -2589,6 +2610,26 @@ static int btintel_pcie_resume(struct device *dev)
bt_dev_err(data->hdev,
"Timeout (%u ms) on alive interrupt for D0 entry",
BTINTEL_DEFAULT_INTR_TIMEOUT_MS);
/* Trigger function level reset if the controller is in error
* state during resume() to bring back the controller to
* operational mode
*/
data->boot_stage_cache = btintel_pcie_rd_reg32(data,
BTINTEL_PCIE_CSR_BOOT_STAGE_REG);
if (btintel_pcie_in_error(data) ||
btintel_pcie_in_device_halt(data)) {
bt_dev_err(data->hdev, "Controller in error state for D0 entry");
if (!test_and_set_bit(BTINTEL_PCIE_COREDUMP_INPROGRESS,
&data->flags)) {
data->dmp_hdr.trigger_reason =
BTINTEL_PCIE_TRIGGER_REASON_FW_ASSERT;
queue_work(data->workqueue, &data->rx_work);
}
set_bit(BTINTEL_PCIE_CORE_HALTED, &data->flags);
btintel_pcie_reset(data->hdev);
}
return -EBUSY;
}

2
drivers/bluetooth/btintel_pcie.h
View File

@ -464,6 +464,7 @@ struct btintel_pcie_dump_header {
* @txq: TX Queue struct
* @rxq: RX Queue struct
* @alive_intr_ctxt: Alive interrupt context
* @pm_sx_event: PM event on which system got suspended
*/
struct btintel_pcie_data {
struct pci_dev *pdev;
@ -513,6 +514,7 @@ struct btintel_pcie_data {
u32 alive_intr_ctxt;
struct btintel_pcie_dbgc dbgc;
struct btintel_pcie_dump_header dmp_hdr;
u8 pm_sx_event;
};
static inline u32 btintel_pcie_rd_reg32(struct btintel_pcie_data *data,