Commit 1fb0d830 authored by Ravindra's avatar Ravindra Committed by Luiz Augusto von Dentz
Browse files

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: default avatarRavindra <ravindra@intel.com>
Signed-off-by: default avatarKiran K <kiran.k@intel.com>
Signed-off-by: default avatarLuiz Augusto von Dentz <luiz.von.dentz@intel.com>
parent 5a6700a3

drivers/bluetooth/btintel_pcie.c

+41 −0
Original line number Diff line number Diff line
@@ -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;

	}

drivers/bluetooth/btintel_pcie.h

+2 −0
Original line number Diff line number Diff line
@@ -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,