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author | Hans de Goede <hdegoede@redhat.com> | 2021-06-29 21:59:07 +0200 |
---|---|---|
committer | Marcel Holtmann <marcel@holtmann.org> | 2021-07-22 16:06:09 +0200 |
commit | b4a46996f1d21c23269cc6b989e4db22ce69061f (patch) | |
tree | 07e85c16f6dae7c77ba1f38a06a659c72c316da9 /drivers | |
parent | 4431531c482a2c05126caaa9fcc5053a4a5c495b (diff) | |
download | linux-stable-b4a46996f1d21c23269cc6b989e4db22ce69061f.tar.gz linux-stable-b4a46996f1d21c23269cc6b989e4db22ce69061f.tar.bz2 linux-stable-b4a46996f1d21c23269cc6b989e4db22ce69061f.zip |
Bluetooth: hci_h5: Disable the hci_suspend_notifier for btrtl devices
The hci_suspend_notifier which was introduced last year, is causing
problems for uart attached btrtl devices. These devices may loose their
firmware and their baudrate setting over a suspend/resume.
Since we don't even know the baudrate after a suspend/resume recovering
from this is tricky. The driver solves this by treating these devices
the same as USB BT HCIs which drop of the bus during suspend.
Specifically the driver:
1. Simply unconditionally turns the device fully off during
system-suspend to save maximum power.
2. Calls device_reprobe() from a workqueue to fully re-init the device
from scratch on system-resume (unregistering the old HCI and
registering a new HCI).
This means that these devices do not benefit from the suspend / resume
handling work done by the hci_suspend_notifier. At best this unnecessarily
adds some time to the suspend/resume time.
But in practice this is actually causing problems:
1. These btrtl devices seem to not like the HCI_OP_WRITE_SCAN_ENABLE(
SCAN_DISABLED) request being send to them when entering the
BT_SUSPEND_CONFIGURE_WAKE state. The same request send on
BT_SUSPEND_DISCONNECT works fine, but the second one send (unnecessarily?)
from the BT_SUSPEND_CONFIGURE_WAKE transition causes the device to hang:
[ 573.497754] PM: suspend entry (s2idle)
[ 573.554615] Filesystems sync: 0.056 seconds
[ 575.837753] Bluetooth: hci0: Timed out waiting for suspend events
[ 575.837801] Bluetooth: hci0: Suspend timeout bit: 4
[ 575.837925] Bluetooth: hci0: Suspend notifier action (3) failed: -110
2. The PM_POST_SUSPEND / BT_RUNNING transition races with the
driver-unbinding done by the device_reprobe() work.
If the hci_suspend_notifier wins the race it is talking to a dead
device leading to the following errors being logged:
[ 598.686060] Bluetooth: hci0: Timed out waiting for suspend events
[ 598.686124] Bluetooth: hci0: Suspend timeout bit: 5
[ 598.686237] Bluetooth: hci0: Suspend notifier action (4) failed: -110
In both cases things still work, but the suspend-notifier is causing
these ugly errors getting logged and ut increase both the suspend- and
the resume-time by 2 seconds.
This commit avoids these problems by disabling the hci_suspend_notifier.
Cc: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Cc: Vasily Khoruzhick <anarsoul@gmail.com>
Cc: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/bluetooth/hci_h5.c | 7 | ||||
-rw-r--r-- | drivers/bluetooth/hci_serdev.c | 3 | ||||
-rw-r--r-- | drivers/bluetooth/hci_uart.h | 7 |
3 files changed, 14 insertions, 3 deletions
diff --git a/drivers/bluetooth/hci_h5.c b/drivers/bluetooth/hci_h5.c index e0520639f4ba..7b985c7cd26d 100644 --- a/drivers/bluetooth/hci_h5.c +++ b/drivers/bluetooth/hci_h5.c @@ -916,6 +916,13 @@ out_free: static void h5_btrtl_open(struct h5 *h5) { + /* + * Since h5_btrtl_resume() does a device_reprobe() the suspend handling + * done by the hci_suspend_notifier is not necessary; it actually causes + * delays and a bunch of errors to get logged, so disable it. + */ + set_bit(HCI_UART_NO_SUSPEND_NOTIFIER, &h5->hu->flags); + /* Devices always start with these fixed parameters */ serdev_device_set_flow_control(h5->hu->serdev, false); serdev_device_set_parity(h5->hu->serdev, SERDEV_PARITY_EVEN); diff --git a/drivers/bluetooth/hci_serdev.c b/drivers/bluetooth/hci_serdev.c index 9e03402ef1b3..3b00d82d36cf 100644 --- a/drivers/bluetooth/hci_serdev.c +++ b/drivers/bluetooth/hci_serdev.c @@ -343,6 +343,9 @@ int hci_uart_register_device(struct hci_uart *hu, hdev->setup = hci_uart_setup; SET_HCIDEV_DEV(hdev, &hu->serdev->dev); + if (test_bit(HCI_UART_NO_SUSPEND_NOTIFIER, &hu->flags)) + set_bit(HCI_QUIRK_NO_SUSPEND_NOTIFIER, &hdev->quirks); + if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags)) set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks); diff --git a/drivers/bluetooth/hci_uart.h b/drivers/bluetooth/hci_uart.h index 4e039d7a16f8..fb4a2d0d8cc8 100644 --- a/drivers/bluetooth/hci_uart.h +++ b/drivers/bluetooth/hci_uart.h @@ -86,9 +86,10 @@ struct hci_uart { }; /* HCI_UART proto flag bits */ -#define HCI_UART_PROTO_SET 0 -#define HCI_UART_REGISTERED 1 -#define HCI_UART_PROTO_READY 2 +#define HCI_UART_PROTO_SET 0 +#define HCI_UART_REGISTERED 1 +#define HCI_UART_PROTO_READY 2 +#define HCI_UART_NO_SUSPEND_NOTIFIER 3 /* TX states */ #define HCI_UART_SENDING 1 |