From: Hilda Wu <hildawu@xxxxxxxxxxx>
For USB ALT 6 settings some Realtek chips need to transmit mSBC data
continuously without the zero length of USB packets.
In this commit, create BTUSB_ALT6_CONTINUOUS_TX to manage the workaround.
Therefore, create REALTEK_ALT6_CONTINUOUS_TX_CHIP to manage the specific
chip model for the workaround.
Signed-off-by: Max Chou <max.chou@xxxxxxxxxxx>
Signed-off-by: Hilda Wu <hildawu@xxxxxxxxxxx>
---
drivers/bluetooth/btrtl.c | 7 +++++++
drivers/bluetooth/btusb.c | 14 +++++++++++++-
2 files changed, 20 insertions(+), 1 deletion(-)
diff --git a/drivers/bluetooth/btrtl.c b/drivers/bluetooth/btrtl.c
index 15223b3ed94d..6d74175cd25f 100644
--- a/drivers/bluetooth/btrtl.c
+++ b/drivers/bluetooth/btrtl.c
@@ -782,6 +782,13 @@ void btrtl_set_quirks(struct hci_dev *hdev, struct btrtl_device_info *btrtl_dev)
set_bit(HCI_QUIRK_VALID_LE_STATES, &hdev->quirks);
set_bit(HCI_QUIRK_WIDEBAND_SPEECH_SUPPORTED, &hdev->quirks);
btrealtek_set_flag(hdev, REALTEK_WBS_FILTER);
+
+ /* RTL8852C needs to transmit mSBC data continuously without
+ * the zero length of USB packets for the ALT 6 supported chips
+ */
+ if (btrtl_dev->project_id == CHIP_ID_8852C)
+ btrealtek_set_flag(hdev, REALTEK_ALT6_CONTINUOUS_TX_CHIP);
+
hci_set_aosp_capable(hdev);
break;
default:
diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index 8e595e03655a..50a21061350e 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -626,6 +626,7 @@ static const struct dmi_system_id btusb_needs_reset_resume_table[] = {
#define BTUSB_TX_WAIT_VND_EVT 13
#define BTUSB_WAKEUP_AUTOSUSPEND 14
#define BTUSB_USE_ALT3_FOR_WBS 15
+#define BTUSB_ALT6_CONTINUOUS_TX 16
struct btusb_data {
struct hci_dev *hdev;
@@ -1284,11 +1285,18 @@ static void btusb_isoc_complete(struct urb *urb)
static inline void __fill_isoc_descriptor_msbc(struct urb *urb, int len,
int mtu, struct btusb_data *data)
{
- int i, offset = 0;
+ int i = 0, offset = 0;
unsigned int interval;
BT_DBG("len %d mtu %d", len, mtu);
+ /* For mSBC ALT 6 settings some Realtek chips need to transmit the data
+ * continuously without the zero length of USB packets.
+ */
+ if (test_bit(BTUSB_ALT6_CONTINUOUS_TX, &data->flags))
+ if (btrealtek_test_flag(data->hdev, REALTEK_ALT6_CONTINUOUS_TX_CHIP))
+ goto ignore_usb_alt6_packet_flow;
+
/* For mSBC ALT 6 setting the host will send the packet at continuous
* flow. As per core spec 5, vol 4, part B, table 2.1. For ALT setting
* 6 the HCI PACKET INTERVAL should be 7.5ms for every usb packets.
@@ -1308,6 +1316,7 @@ static inline void __fill_isoc_descriptor_msbc(struct urb *urb, int len,
urb->iso_frame_desc[i].length = offset;
}
+ignore_usb_alt6_packet_flow:
if (len && i < BTUSB_MAX_ISOC_FRAMES) {
urb->iso_frame_desc[i].offset = offset;
urb->iso_frame_desc[i].length = len;
@@ -3931,6 +3940,9 @@ static int btusb_probe(struct usb_interface *intf,
/* Realtek devices need to set remote wakeup on auto-suspend */
set_bit(BTUSB_WAKEUP_AUTOSUSPEND, &data->flags);
set_bit(BTUSB_USE_ALT3_FOR_WBS, &data->flags);
+
+ /* Some Realtek devices need to transmit mSBC data continuously */
+ set_bit(BTUSB_ALT6_CONTINUOUS_TX, &data->flags);
}
if (!reset)
--
2.17.1
