Hi Joao Paulo, > As reported previously on [1], it is currently not possible to discover > BLE devices with QCA9377 controllers. When trying to start an active > scanning procedure with this controller, three commands are queued, > LE_SET_RANDOM_ADDR, LE_SET_SCAN_PARAM and LE_SET_SCAN_ENABLE. After the > first command is sent to the controller, a command complete event for it > is received, and the second command is sent, an extra command complete > for the first command is received. At this point the kernel sends the > next command and fails to process the command complete event for the > LE_SET_SCAN_PARAM command, because when it arrives it does not match the > last command that was sent. This makes hdev->le_scan_type never be > updated and the kernel behaves as if a passive scanning procedure was > being performed, thus no device found events are sent to userspace. > > [1] https://www.spinics.net/lists/linux-bluetooth/msg79102.html > > I have received no replies on the previous report and on further > attempts to contact the QCA addresses that have submitted Bluetooth > firmware blobs to linux-firmware upstream. This series avoids the > problem described above, but I believe ideally the controller should not > be sending this extra command complete event. > > I'm not 100% sure if the approach taken here is the best way to work > around this problem in the kernel, as I am not super familiar with the > HCI layer. I'll be happy to hear suggestions of better approaches. > > Full logs from btmon can be found bellow this message, and the extra > command complete event can be seen at timestamp 27.420131. so can we get a fixed firmware from Qualcomm? Or at least some ROM patches for it? > Best regards, > > João Paulo Rechi Vita (2): > Bluetooth: Create new HCI_QUIRK_WAIT_FOR_MATCHING_CC > Bluetooth: Set HCI_QUIRK_WAIT_FOR_MATCHING_CC for QCA9377 > > drivers/bluetooth/btusb.c | 9 +++++++++ > include/net/bluetooth/hci.h | 4 ++++ > include/net/bluetooth/hci_core.h | 1 + > net/bluetooth/hci_core.c | 3 +++ > net/bluetooth/hci_event.c | 4 ++++ > 5 files changed, 21 insertions(+) > > -- > 2.20.1 > > Bluetooth monitor ver 5.50 > = Note: Linux version 5.0.0+ (x86_64) 0.352340 > = Note: Bluetooth subsystem version 2.22 0.352343 > = New Index: 80:C5:F2:8F:87:84 (Primary,USB,hci0) [hci0] 0.352344 > = Open Index: 80:C5:F2:8F:87:84 [hci0] 0.352345 > = Index Info: 80:C5:F2:8F:87:84 (Qualcomm) [hci0] 0.352346 > @ MGMT Open: bluetoothd (privileged) version 1.14 {0x0001} 0.352347 > @ MGMT Open: btmon (privileged) version 1.14 {0x0002} 0.352366 > @ MGMT Open: btmgmt (privileged) version 1.14 {0x0003} 27.302164 > @ MGMT Command: Start Discovery (0x0023) plen 1 {0x0003} [hci0] 27.302310 > Address type: 0x06 > LE Public > LE Random > < HCI Command: LE Set Random Address (0x08|0x0005) plen 6 #1 [hci0] 27.302496 > Address: 15:60:F2:91:B2:24 (Non-Resolvable) >> HCI Event: Command Complete (0x0e) plen 4 #2 [hci0] 27.419117 > LE Set Random Address (0x08|0x0005) ncmd 1 > Status: Success (0x00) > < HCI Command: LE Set Scan Parameters (0x08|0x000b) plen 7 #3 [hci0] 27.419244 > Type: Active (0x01) > Interval: 11.250 msec (0x0012) > Window: 11.250 msec (0x0012) > Own address type: Random (0x01) > Filter policy: Accept all advertisement (0x00) >> HCI Event: Command Complete (0x0e) plen 4 #4 [hci0] 27.420131 > LE Set Random Address (0x08|0x0005) ncmd 1 > Status: Success (0x00) so we really need to ignore this command complete and not start ahead with the next command. Especially since we really only support one command at a time right now. > < HCI Command: LE Set Scan Enable (0x08|0x000c) plen 2 #5 [hci0] 27.420259 > Scanning: Enabled (0x01) > Filter duplicates: Enabled (0x01) >> HCI Event: Command Complete (0x0e) plen 4 #6 [hci0] 27.420969 > LE Set Scan Parameters (0x08|0x000b) ncmd 1 > Status: Success (0x00) We need for this command complete to arrive and only then continue with LE Set Scan Enable. We don’t need a quirk for it. Just add support for dealing with unexpected command complete opcodes. And print a big error if that happens. >> HCI Event: Command Complete (0x0e) plen 4 #7 [hci0] 27.421983 > LE Set Scan Enable (0x08|0x000c) ncmd 1 > Status: Success (0x00) > @ MGMT Event: Command Complete (0x0001) plen 4 {0x0003} [hci0] 27.422059 > Start Discovery (0x0023) plen 1 > Status: Success (0x00) > Address type: 0x06 > LE Public > LE Random Regards Marcel
