linux-kernel - Re: [PATCH v1] Bluetooth: btusb: Fix enable failure for a CSR BT dongle

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Message-ID: <8c9bbcde-6dcb-2e31-d3d8-c51d8fe03035@quicinc.com>
Date:   Fri, 28 Oct 2022 10:57:15 +0800
From:   quic_zijuhu <quic_zijuhu@...cinc.com>
To:     Paul Menzel <pmenzel@...gen.mpg.de>
CC:     <marcel@...tmann.org>, <johan.hedberg@...il.com>,
        <luiz.dentz@...il.com>, <luiz.von.dentz@...el.com>,
        <linux-kernel@...r.kernel.org>, <linux-bluetooth@...r.kernel.org>,
        <netdev@...r.kernel.org>, Zijun Hu <zijuhu@....qualcomm.com>
Subject: Re: [PATCH v1] Bluetooth: btusb: Fix enable failure for a CSR BT
 dongle

On 10/27/2022 7:18 PM, Paul Menzel wrote:
> Dear Zijun,
> 
> 
> Thank you for the patch.
> 
> 
> Am 27.10.22 um 13:06 schrieb Zijun Hu:
>> From: Zijun Hu <zijuhu@....qualcomm.com>
> 
> I‘d be more specific in the summary/title. Maybe:
> 
> Correct quirk check to include BT 4.0
> 
>> A CSR BT dongle fails to be enabled bcz it is not detected as fake
> 
> I’d write *because*.
> 
>> rightly, fixed by correcting fake detection condition.
>>
>> below btmon error log says HCI_QUIRK_BROKEN_FILTER_CLEAR_ALL is not set.
>>
>> < HCI Command: Set Event Filter (0x03|0x0005) plen 1        #23 [hci0]
>>          Type: Clear All Filters (0x00)
>>> HCI Event: Command Complete (0x0e) plen 4                 #24 [hci0]
>>        Set Event Filter (0x03|0x0005) ncmd 1
>>          Status: Invalid HCI Command Parameters (0x12)
>>
>> the quirk is not set bcz current fake detection does not mark the dongle
>> as fake with below version info.
>>
>> < HCI Command: Read Local Version In.. (0x04|0x0001) plen 0  #1 [hci0]
>>> HCI Event: Command Complete (0x0e) plen 12                 #2 [hci0]
>>        Read Local Version Information (0x04|0x0001) ncmd 1
>>          Status: Success (0x00)
>>          HCI version: Bluetooth 4.0 (0x06) - Revision 12576 (0x3120)
>>          LMP version: Bluetooth 4.0 (0x06) - Subversion 8891 (0x22bb)
>>          Manufacturer: Cambridge Silicon Radio (10)
>>
>> Link: https://bugzilla.kernel.org/show_bug.cgi?id=60824
>> Signed-off-by: Zijun Hu <zijuhu@....qualcomm.com>
> 
> Please add a Fixes: tag.
> 
> 
> Kind regards,
> 
> Paul
> 
> 
>> ---
>>   drivers/bluetooth/btusb.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
>> index 420be2ee2acf..727469d073f9 100644
>> --- a/drivers/bluetooth/btusb.c
>> +++ b/drivers/bluetooth/btusb.c
>> @@ -2155,7 +2155,7 @@ static int btusb_setup_csr(struct hci_dev *hdev)
>>           is_fake = true;
>>         else if (le16_to_cpu(rp->lmp_subver) <= 0x22bb &&
>> -         le16_to_cpu(rp->hci_ver) > BLUETOOTH_VER_4_0)
>> +         le16_to_cpu(rp->hci_ver) >= BLUETOOTH_VER_4_0)
>>           is_fake = true;
>>         /* Other clones which beat all the above checks */

thank you Paul for your code review.
i am sorry, please Ignore this wrong fix.
the enable failure should be  caused that below fix is not be picked up
https://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth-next.git/commit/?id=b3cf94c8b6b2f1a2b94825a025db291da2b151fd