linux_dsm_epyc7002/drivers/bluetooth
Claire Chang 41d5b25fed Bluetooth: hci_qca: add PM support
Add PM suspend/resume callbacks for hci_qca driver.

BT host will make sure both Rx and Tx go into sleep state in
qca_suspend. Without this, Tx may still remain in awake state, which
prevents BTSOC from entering deep sleep. For example, BlueZ will send
Set Event Mask to device when suspending and this will wake the device
Rx up. However, the Tx idle timeout on the host side is 2000 ms. If the
host is suspended before its Tx idle times out, it won't send
HCI_IBS_SLEEP_IND to the device and the device Rx will remain awake.

We implement this by canceling relevant work in workqueue, sending
HCI_IBS_SLEEP_IND to the device and then waiting HCI_IBS_SLEEP_IND sent
by the device.

In order to prevent the device from being awaken again after qca_suspend
is called, we introduce QCA_SUSPEND flag. QCA_SUSPEND is set in the
beginning of qca_suspend to indicate system is suspending and that we'd
like to ignore any further wake events.

With QCA_SUSPEND and spinlock, we can avoid race condition, e.g. if
qca_enqueue acquires qca->hci_ibs_lock before qca_suspend calls
cancel_work_sync and then qca_enqueue adds a new qca->ws_awake_device
work after the previous one is cancelled.

If BTSOC wants to wake the whole system up after qca_suspend is called,
it will keep sending HCI_IBS_WAKE_IND and uart driver will take care of
waking the system. For example, uart driver will reconfigure its Rx pin
to a normal GPIO pin and enable irq wake on that pin when suspending.
Once host detects Rx falling, the system will begin resuming. Then, the
BT host clears QCA_SUSPEND flag in qca_resume and begins dealing with
normal HCI packets. By doing so, only a few HCI_IBS_WAKE_IND packets are
lost and there is no data packet loss.

Signed-off-by: Claire Chang <tientzu@chromium.org>
Reviewed-by: Balakrishna Godavarthi <bgodavar@codeaurora.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2019-11-04 15:17:52 +01:00
..
ath3k.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
bcm203x.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
bfusb.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
bluecard_cs.c bluetooth: bluecard_cs: Replace GFP_ATOMIC with GFP_KERNEL in bluecard_hci_set_baud_rate() 2018-07-23 18:05:00 +02:00
bpa10x.c Bluetooth: bpa10x: change return value 2019-09-04 16:11:46 +02:00
bt3c_cs.c Bluetooth: bt3c_cs: Fix obsolete function 2018-09-27 12:57:39 +02:00
btbcm.c bluetooth: bcm: Add support for loading firmware for BCM4345C5 2019-09-05 17:27:22 +02:00
btbcm.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
btintel.c Bluetooth: btusb: Trigger Intel FW download error recovery 2019-10-17 09:23:47 +02:00
btintel.h Bluetooth: btusb: Remove return statement in btintel_reset_to_bootloader 2019-10-19 09:56:20 +02:00
btmrvl_debugfs.c Bluetooth: btmrvl: Re-use kstrtol_from_user() 2018-05-30 08:16:05 +02:00
btmrvl_drv.h Bluetooth: btmrvl: Drop unused GPIO includes 2019-01-22 09:51:20 +01:00
btmrvl_main.c Bluetooth: btmrvl: support sysfs initiated firmware coredump 2018-05-29 15:59:50 +02:00
btmrvl_sdio.c Bluetooth: btmrvl: add support for SD8987 chipset 2019-04-23 19:01:45 +02:00
btmrvl_sdio.h btmrvl: add platform specific wakeup interrupt support 2016-05-02 19:26:15 +02:00
btmtksdio.c Bluetooth: btmtksdio: Add runtime PM support to SDIO based Bluetooth 2019-04-23 18:36:20 +02:00
btmtkuart.c Bluetooth: btmtkuart: add an implementation for clock osc property 2019-07-06 13:00:04 +02:00
btqca.c Bluetooth: hci_qca: wait for Pre shutdown complete event before sending the Power off pulse 2019-09-05 17:27:22 +02:00
btqca.h Bluetooth: hci_qca: Send VS pre shutdown command. 2019-08-12 18:23:50 +02:00
btqcomsmd.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 284 2019-06-05 17:36:37 +02:00
btrsi.c Bluetooth: btrsi: fix bt tx timeout issue 2018-09-27 12:53:40 +02:00
btrtl.c Bluetooth: btrtl: remove unneeded semicolon 2019-10-26 07:23:30 +02:00
btrtl.h Bluetooth: btrtl: HCI reset on close for Realtek BT chip 2019-07-06 12:32:50 +02:00
btsdio.c Bluetooth: btsdio: Do not bind to non-removable BCM4356 2019-07-06 12:27:55 +02:00
btusb.c Bluetooth: btusb: Trigger Intel FW download error recovery 2019-10-17 09:23:47 +02:00
dtl1_cs.c networking: add and use skb_put_u8() 2017-06-16 11:48:40 -04:00
h4_recv.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
hci_ag6xx.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
hci_ath.c Bluetooth: hci_uart: check for missing tty operations 2019-07-31 13:17:33 -07:00
hci_bcm.c Bluetooth: hci_bcm: Add compatible string for BCM43540 2019-10-26 07:25:37 +02:00
hci_bcsp.c Bluetooth: hci_bcsp: Fix memory leak in rx_skb 2019-07-06 13:02:38 +02:00
hci_h4.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
hci_h5.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
hci_intel.c Bluetooth: hci_uart: check for missing tty operations 2019-07-31 13:17:33 -07:00
hci_ldisc.c Bluetooth: hci_uart: check for missing tty operations 2019-07-31 13:17:33 -07:00
hci_ll.c Revert "Bluetooth: hci_ll: set operational frequency earlier" 2019-10-16 20:33:16 +02:00
hci_mrvl.c Bluetooth: hci_uart: check for missing tty operations 2019-07-31 13:17:33 -07:00
hci_nokia.c Bluetooth: hci_nokia: Save a few cycles in 'nokia_enqueue()' 2019-10-16 19:26:40 +02:00
hci_qca.c Bluetooth: hci_qca: add PM support 2019-11-04 15:17:52 +01:00
hci_serdev.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157 2019-05-30 11:26:37 -07:00
hci_uart.h Bluetooth: hci_uart: check for missing tty operations 2019-07-31 13:17:33 -07:00
hci_vhci.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
Kconfig Bluetooth: btwilink: drop superseded driver 2019-10-16 21:12:52 +02:00
Makefile Bluetooth: btwilink: drop superseded driver 2019-10-16 21:12:52 +02:00