Hello Marcel, thanks for the quick response. On Wed, Apr 24, 2019 at 12:17 AM Marcel Holtmann <marcel@xxxxxxxxxxxx> wrote: > > 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? > That was my initial expectation as well -- maybe you can show the problem to some Qualcomm contacts? > > 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. > Agreed. > > < 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. > Makes sense, I'm sending an updated version ignoring unexpected CC events on all hardware. Looking at the code it seems the only exception is a CC event for HCI_OP_RESET on some CSR controllers, which is handled in hci_req_cmd_complete, so I'm letting that flow through. -- João Paulo Rechi Vita http://about.me/jprvita
