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Subject[PATCH v2] Bluetooth: btusb: USB alternate setting 1 for WBS
Date
From: Hilda Wu <hildawu@realtek.com>

RTL8822CE supports transparent WBS to apply USB alternate setting 1.
Add a flag to the device match data to apply alternate setting 1 which
meet the transfer speed for WBS support.

Signed-off-by: Hilda Wu <hildawu@realtek.com>
---
Changes in v2:
- More descriptive commit log and short description.
- Use BTUSB_USE_ALT1_FOR_WBS replace BTUSB_WBS_ALT1 for descriptive name.
- Move alternate setting 1 check into the btusb_probe() function and adjust position of data->isoc for alternate setting check.
---
---
drivers/bluetooth/btusb.c | 34 ++++++++++++++++++++--------------
1 file changed, 20 insertions(+), 14 deletions(-)

diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index c7cc8e594166..e4a12c58501e 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -453,6 +453,7 @@ static const struct dmi_system_id btusb_needs_reset_resume_table[] = {
#define BTUSB_HW_RESET_ACTIVE 12
#define BTUSB_TX_WAIT_VND_EVT 13
#define BTUSB_WAKEUP_DISABLE 14
+#define BTUSB_USE_ALT1_FOR_WBS 15

struct btusb_data {
struct hci_dev *hdev;
@@ -1666,14 +1667,15 @@ static void btusb_work(struct work_struct *work)
new_alts = data->sco_num;
}
} else if (data->air_mode == HCI_NOTIFY_ENABLE_SCO_TRANSP) {
-
- data->usb_alt6_packet_flow = true;
-
/* Check if Alt 6 is supported for Transparent audio */
- if (btusb_find_altsetting(data, 6))
+ if (btusb_find_altsetting(data, 6)) {
+ data->usb_alt6_packet_flow = true;
new_alts = 6;
- else
+ } else if (test_bit(BTUSB_USE_ALT1_FOR_WBS, &data->flags)) {
+ new_alts = 1;
+ } else {
bt_dev_err(hdev, "Device does not support ALT setting 6");
+ }
}

if (btusb_switch_alt_setting(hdev, new_alts) < 0)
@@ -3954,6 +3956,15 @@ static int btusb_probe(struct usb_interface *intf,
btusb_check_needs_reset_resume(intf);
}

+ if (id->driver_info & BTUSB_AMP) {
+ /* AMP controllers do not support SCO packets */
+ data->isoc = NULL;
+ } else {
+ /* Interface orders are hardcoded in the specification */
+ data->isoc = usb_ifnum_to_if(data->udev, ifnum_base + 1);
+ data->isoc_ifnum = ifnum_base + 1;
+ }
+
if (IS_ENABLED(CONFIG_BT_HCIBTUSB_RTL) &&
(id->driver_info & BTUSB_REALTEK)) {
hdev->setup = btrtl_setup_realtek;
@@ -3965,21 +3976,16 @@ static int btusb_probe(struct usb_interface *intf,
* (DEVICE_REMOTE_WAKEUP)
*/
set_bit(BTUSB_WAKEUP_DISABLE, &data->flags);
+ if (btusb_find_altsetting(data, 1))
+ set_bit(BTUSB_USE_ALT1_FOR_WBS, &data->flags);
+ else
+ bt_dev_err(hdev, "Device does not support ALT setting 1");

err = usb_autopm_get_interface(intf);
if (err < 0)
goto out_free_dev;
}

- if (id->driver_info & BTUSB_AMP) {
- /* AMP controllers do not support SCO packets */
- data->isoc = NULL;
- } else {
- /* Interface orders are hardcoded in the specification */
- data->isoc = usb_ifnum_to_if(data->udev, ifnum_base + 1);
- data->isoc_ifnum = ifnum_base + 1;
- }
-
if (!reset)
set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);

--
2.17.1
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