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authorVenkata Lakshmi Narayana Gubba <gubbaven@codeaurora.org>2020-09-10 13:30:42 +0300
committerMarcel Holtmann <marcel@holtmann.org>2020-09-11 10:09:48 +0300
commitde8892df72be76828a1040799d47a34a1c58a563 (patch)
treeb540cf6e0d054fb3ac1505e91acd958d755437ec /drivers/bluetooth/hci_serdev.c
parent0fc1a726f897acfa774b17eeb62b38480d1c9ea0 (diff)
downloadlinux-de8892df72be76828a1040799d47a34a1c58a563.tar.xz
Bluetooth: hci_serdev: Close UART port if NON_PERSISTENT_SETUP is set
When HCI_QUIRK_NON_PERSISTENT_SETUP is set by drivers, it indicates that BT SoC will be completely powered OFF during BT OFF. On next BT ON firmware must be downloaded again. Holding UART port open during BT OFF is draining the battery. Now during BT OFF, UART port is closed if qurik HCI_QUIRK_NON_PERSISTENT_SETUP is set by clearing HCI_UART_PROTO_READY proto flag. On next BT ON, UART port is opened if HCI_UART_PROTO_READY proto flag is cleared. Signed-off-by: Venkata Lakshmi Narayana Gubba <gubbaven@codeaurora.org> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Diffstat (limited to 'drivers/bluetooth/hci_serdev.c')
-rw-r--r--drivers/bluetooth/hci_serdev.c36
1 files changed, 33 insertions, 3 deletions
diff --git a/drivers/bluetooth/hci_serdev.c b/drivers/bluetooth/hci_serdev.c
index 3977bba485c2..ef96ad06fa54 100644
--- a/drivers/bluetooth/hci_serdev.c
+++ b/drivers/bluetooth/hci_serdev.c
@@ -113,8 +113,22 @@ static int hci_uart_flush(struct hci_dev *hdev)
/* Initialize device */
static int hci_uart_open(struct hci_dev *hdev)
{
+ struct hci_uart *hu = hci_get_drvdata(hdev);
+ int err;
+
BT_DBG("%s %p", hdev->name, hdev);
+ /* When Quirk HCI_QUIRK_NON_PERSISTENT_SETUP is set by
+ * driver, BT SoC is completely turned OFF during
+ * BT OFF. Upon next BT ON UART port should be opened.
+ */
+ if (!test_bit(HCI_UART_PROTO_READY, &hu->flags)) {
+ err = serdev_device_open(hu->serdev);
+ if (err)
+ return err;
+ set_bit(HCI_UART_PROTO_READY, &hu->flags);
+ }
+
/* Undo clearing this from hci_uart_close() */
hdev->flush = hci_uart_flush;
@@ -124,11 +138,25 @@ static int hci_uart_open(struct hci_dev *hdev)
/* Close device */
static int hci_uart_close(struct hci_dev *hdev)
{
+ struct hci_uart *hu = hci_get_drvdata(hdev);
+
BT_DBG("hdev %p", hdev);
+ if (!test_bit(HCI_UART_PROTO_READY, &hu->flags))
+ return 0;
+
hci_uart_flush(hdev);
hdev->flush = NULL;
+ /* When QUIRK HCI_QUIRK_NON_PERSISTENT_SETUP is set by driver,
+ * BT SOC is completely powered OFF during BT OFF, holding port
+ * open may drain the battery.
+ */
+ if (test_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks)) {
+ clear_bit(HCI_UART_PROTO_READY, &hu->flags);
+ serdev_device_close(hu->serdev);
+ }
+
return 0;
}
@@ -354,8 +382,6 @@ void hci_uart_unregister_device(struct hci_uart *hu)
{
struct hci_dev *hdev = hu->hdev;
- clear_bit(HCI_UART_PROTO_READY, &hu->flags);
-
cancel_work_sync(&hu->init_ready);
if (test_bit(HCI_UART_REGISTERED, &hu->flags))
hci_unregister_dev(hdev);
@@ -364,6 +390,10 @@ void hci_uart_unregister_device(struct hci_uart *hu)
cancel_work_sync(&hu->write_work);
hu->proto->close(hu);
- serdev_device_close(hu->serdev);
+
+ if (test_bit(HCI_UART_PROTO_READY, &hu->flags)) {
+ clear_bit(HCI_UART_PROTO_READY, &hu->flags);
+ serdev_device_close(hu->serdev);
+ }
}
EXPORT_SYMBOL_GPL(hci_uart_unregister_device);