Hi Marcel On Fri, Nov 22, 2019 at 6:15 PM Marcel Holtmann <marcel@xxxxxxxxxxxx> wrote: > > Hi Sathish, > > > For msbc encoded audio stream over usb transport, btusb driver > > to be set to alternate settings 6 as per BT core spec 5.0. This > > done from hci_sync_conn_complete_evt. The type of air mode is known > > during this event. For this reason the btusb is to be notifed > > about the TRANSPARENT air mode and the ALT setting 6 is selected. > > The changes are made considering some discussion over the similar > > patch submitted earlier from Kuba Pawlak(link below) > > https://www.spinics.net/lists/linux-bluetooth/msg64577.html > > > > (am from https://www.spinics.net/lists/linux-bluetooth/msg76982.html) > > > > Reported-by: kbuild test robot <lkp@xxxxxxxxx> > > Signed-off-by: Sathish Narasimman <sathish.narasimman@xxxxxxxxx> > > Signed-off-by: Chethan T N <chethan.tumkur.narayan@xxxxxxxxx> > > Signed-off-by: Hsin-Yu Chao <hychao@xxxxxxxxxxxx> > > Signed-off-by: Amit K Bag <amit.k.bag@xxxxxxxxx> > > --- > > drivers/bluetooth/btusb.c | 157 ++++++++++++++++++++++++------- > > include/net/bluetooth/hci.h | 7 +- > > include/net/bluetooth/hci_core.h | 3 + > > net/bluetooth/hci_conn.c | 2 - > > net/bluetooth/hci_event.c | 9 ++ > > 5 files changed, 137 insertions(+), 41 deletions(-) > > > > diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c > > index 04a139e7793f..7a4260757822 100644 > > --- a/drivers/bluetooth/btusb.c > > +++ b/drivers/bluetooth/btusb.c > > @@ -483,6 +483,8 @@ struct btusb_data { > > __u8 cmdreq; > > > > unsigned int sco_num; > > + unsigned int air_mode; > > + bool usb_alt6_packet_flow; > > int isoc_altsetting; > > int suspend_count; > > > > @@ -974,6 +976,42 @@ static void btusb_isoc_complete(struct urb *urb) > > } > > } > > > > +static inline void __fill_isoc_descriptor_msbc(struct urb *urb, int len, > > + int mtu, bool packet_flow) > > +{ > > + int i, offset = 0; > > + unsigned int interval; > > + > > + /* 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. > > + * To maintain the rate we send 63bytes of usb packets alternatively for > > + * 7ms and 8ms to maintain the rate as 7.5ms. > > + */ > > + if (packet_flow) { > > + interval = 7; > > + packet_flow = false; > > + } else { > > + interval = 6; > > + packet_flow = true; > > + } > > + > > + BT_DBG("interval:%d len %d mtu %d", interval, len, mtu); > > + > > + for (i = 0; i < interval; i++) { > > + urb->iso_frame_desc[i].offset = offset; > > + urb->iso_frame_desc[i].length = offset; > > + } > > + > > + if (len && i < BTUSB_MAX_ISOC_FRAMES) { > > + urb->iso_frame_desc[i].offset = offset; > > + urb->iso_frame_desc[i].length = len; > > + i++; > > + } > > + > > + urb->number_of_packets = i; > > +} > > + > > static inline void __fill_isoc_descriptor(struct urb *urb, int len, int mtu) > > { > > int i, offset = 0; > > @@ -1376,9 +1414,13 @@ static struct urb *alloc_isoc_urb(struct hci_dev *hdev, struct sk_buff *skb) > > > > urb->transfer_flags = URB_ISO_ASAP; > > > > - __fill_isoc_descriptor(urb, skb->len, > > + if (data->isoc_altsetting == 6) > > + __fill_isoc_descriptor_msbc(urb, skb->len, > > + le16_to_cpu(data->isoc_tx_ep->wMaxPacketSize), > > + data->usb_alt6_packet_flow); > > + else > > + __fill_isoc_descriptor(urb, skb->len, > > le16_to_cpu(data->isoc_tx_ep->wMaxPacketSize)); > > - > > skb->dev = (void *)hdev; > > > > return urb; > > @@ -1474,6 +1516,7 @@ static void btusb_notify(struct hci_dev *hdev, unsigned int evt) > > > > if (hci_conn_num(hdev, SCO_LINK) != data->sco_num) { > > data->sco_num = hci_conn_num(hdev, SCO_LINK); > > + data->air_mode = evt; > > schedule_work(&data->work); > > } > > } > > @@ -1521,11 +1564,70 @@ static inline int __set_isoc_interface(struct hci_dev *hdev, int altsetting) > > return 0; > > } > > > > +static int bt_switch_alt_setting(struct hci_dev *hdev, int new_alts) > > +{ > > + struct btusb_data *data = hci_get_drvdata(hdev); > > + int err; > > + > > + if (data->isoc_altsetting != new_alts) { > > + unsigned long flags; > > + > > + clear_bit(BTUSB_ISOC_RUNNING, &data->flags); > > + usb_kill_anchored_urbs(&data->isoc_anchor); > > + > > + /* When isochronous alternate setting needs to be > > + * changed, because SCO connection has been added > > + * or removed, a packet fragment may be left in the > > + * reassembling state. This could lead to wrongly > > + * assembled fragments. > > + * > > + * Clear outstanding fragment when selecting a new > > + * alternate setting. > > + */ > > + spin_lock_irqsave(&data->rxlock, flags); > > + kfree_skb(data->sco_skb); > > + data->sco_skb = NULL; > > + spin_unlock_irqrestore(&data->rxlock, flags); > > + > > + err = __set_isoc_interface(hdev, new_alts); > > + if (err < 0) > > + return err; > > + } > > + if (!test_and_set_bit(BTUSB_ISOC_RUNNING, &data->flags)) { > > + if (btusb_submit_isoc_urb(hdev, GFP_KERNEL) < 0) > > + clear_bit(BTUSB_ISOC_RUNNING, &data->flags); > > + else > > + btusb_submit_isoc_urb(hdev, GFP_KERNEL); > > + } > > + > > + return 0; > > +} > > + > > +static struct usb_host_interface *btusb_find_altsetting(struct btusb_data *data, int alt) > > +{ > > + struct usb_interface *intf = data->isoc; > > + int i; > > + > > + BT_DBG("Looking for Alt no :%d", alt); > > + > > + if (intf == NULL) { > > + BT_ERR("INterface NULL"); > > + return NULL; > > + } > > + > > + for (i = 0; i < intf->num_altsetting; i++) { > > + if (intf->altsetting[i].desc.bAlternateSetting == alt) > > + return &intf->altsetting[i]; > > + } > > + > > + return NULL; > > +} > > + > > static void btusb_work(struct work_struct *work) > > { > > struct btusb_data *data = container_of(work, struct btusb_data, work); > > struct hci_dev *hdev = data->hdev; > > - int new_alts; > > + int new_alts = 0; > > int err; > > > > if (data->sco_num > 0) { > > @@ -1540,44 +1642,27 @@ static void btusb_work(struct work_struct *work) > > set_bit(BTUSB_DID_ISO_RESUME, &data->flags); > > } > > > > - if (hdev->voice_setting & 0x0020) { > > - static const int alts[3] = { 2, 4, 5 }; > > - > > - new_alts = alts[data->sco_num - 1]; > > - } else { > > - new_alts = data->sco_num; > > - } > > - > > - if (data->isoc_altsetting != new_alts) { > > - unsigned long flags; > > + if (data->air_mode == HCI_NOTIFY_ENABLE_SCO_CVSD) { > > + if (hdev->voice_setting & 0x0020) { > > + static const int alts[3] = { 2, 4, 5 }; > > > > - clear_bit(BTUSB_ISOC_RUNNING, &data->flags); > > - usb_kill_anchored_urbs(&data->isoc_anchor); > > - > > - /* When isochronous alternate setting needs to be > > - * changed, because SCO connection has been added > > - * or removed, a packet fragment may be left in the > > - * reassembling state. This could lead to wrongly > > - * assembled fragments. > > - * > > - * Clear outstanding fragment when selecting a new > > - * alternate setting. > > - */ > > - spin_lock_irqsave(&data->rxlock, flags); > > - kfree_skb(data->sco_skb); > > - data->sco_skb = NULL; > > - spin_unlock_irqrestore(&data->rxlock, flags); > > + new_alts = alts[data->sco_num - 1]; > > + } else { > > + new_alts = data->sco_num; > > + } > > + } else if (data->air_mode == HCI_NOTIFY_ENABLE_SCO_TRANSP) { > > > > - if (__set_isoc_interface(hdev, new_alts) < 0) > > - return; > > - } > > + data->usb_alt6_packet_flow = true; > > > > - if (!test_and_set_bit(BTUSB_ISOC_RUNNING, &data->flags)) { > > - if (btusb_submit_isoc_urb(hdev, GFP_KERNEL) < 0) > > - clear_bit(BTUSB_ISOC_RUNNING, &data->flags); > > + /* Check if Alt 6 is supported for Transparent audio*/ > > + if (btusb_find_altsetting(data, 6)) > > + new_alts = 6; > > else > > - btusb_submit_isoc_urb(hdev, GFP_KERNEL); > > + BT_ERR("%s Device does not support ALT setting 6", hdev->name); > > } > > + > > + if (bt_switch_alt_setting(hdev, new_alts) < 0) > > + BT_ERR("%s Set USB Alt: %d failed!", hdev->name, new_alts); > > } else { > > clear_bit(BTUSB_ISOC_RUNNING, &data->flags); > > usb_kill_anchored_urbs(&data->isoc_anchor); > > diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h > > index 5bc1e30dedde..8183394c2cc0 100644 > > --- a/include/net/bluetooth/hci.h > > +++ b/include/net/bluetooth/hci.h > > @@ -49,9 +49,10 @@ > > #define HCI_DEV_SETUP 9 > > > > /* HCI notify events */ > > -#define HCI_NOTIFY_CONN_ADD 1 > > -#define HCI_NOTIFY_CONN_DEL 2 > > -#define HCI_NOTIFY_VOICE_SETTING 3 > > +#define HCI_NOTIFY_ENABLE_SCO_CVSD 1 > > +#define HCI_NOTIFY_ENABLE_SCO_TRANSP 2 > > +#define HCI_NOTIFY_CONN_DEL 3 > > +#define HCI_NOTIFY_VOICE_SETTING 4 > > hmmm. Can we keep CONN_ADD and CONN_DEL for the ACL and LE links. And then introduce ENABLE_SCO_CVSD, ENABLE_SCO_TRANSP and DISABLE_SCO. Right now this patch creates an imbalance. we have HCI_NOTIFY_CONN_DEL what is the reason the use DISABLE_SCO. where we need to notify this. Do I miss something? > > And we need to split the core changes and the USB driver changes into separate patches. will split it and update the next version > > Regards > > Marcel > Regards Sathish N
