Bluetooth: hci_h5: btrtl: Maintain flow control if wakeup is enabled

For chips that doesn't reset on suspend, we need to provide the correct
value of flow_control when it resumes. Therefore, store the flow
control value when reading from the config file to be reused upon
suspend.

Signed-off-by: Archie Pusaka <apusaka@chromium.org>
Reviewed-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>
Reviewed-by: Hilda Wu <hildawu@realtek.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

diff --git a/drivers/bluetooth/hci_h5.c b/drivers/bluetooth/hci_h5.c
index fd67211..cbc63b0 100644 (file)
--- a/drivers/bluetooth/hci_h5.c
+++ b/drivers/bluetooth/hci_h5.c
@@ -54,6 +54,7 @@ enum {
        H5_RX_ESC,              /* SLIP escape mode */
        H5_TX_ACK_REQ,          /* Pending ack to send */
        H5_WAKEUP_DISABLE,      /* Device cannot wake host */
+       H5_HW_FLOW_CONTROL,     /* Use HW flow control */
 };
 
 struct h5 {
@@ -920,6 +921,9 @@ static int h5_btrtl_setup(struct h5 *h5)
        serdev_device_set_baudrate(h5->hu->serdev, controller_baudrate);
        serdev_device_set_flow_control(h5->hu->serdev, flow_control);
 
+       if (flow_control)
+               set_bit(H5_HW_FLOW_CONTROL, &h5->flags);
+
        err = btrtl_download_firmware(h5->hu->hdev, btrtl_dev);
        /* Give the device some time before the hci-core sends it a reset */
        usleep_range(10000, 20000);
@@ -1012,7 +1016,11 @@ static int h5_btrtl_resume(struct h5 *h5)
                queue_work(system_long_wq, &reprobe->work);
        } else {
                gpiod_set_value_cansleep(h5->device_wake_gpio, 1);
+
+               if (test_bit(H5_HW_FLOW_CONTROL, &h5->flags))
+                       serdev_device_set_flow_control(h5->hu->serdev, true);
        }
+
        return 0;
 }