linux-kernel - Re: [PATCH v7 1/2] Bluetooth: add quirk disabling LE Read Transmit Power

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Message-ID: <AF3FE4B9-2210-40CE-93F4-A8EAFFD81E3B@live.com>
Date:   Tue, 30 Nov 2021 11:50:06 +0000
From:   Aditya Garg <gargaditya08@...e.com>
To:     Greg KH <gregkh@...uxfoundation.org>
CC:     Marcel Holtmann <marcel@...tmann.org>,
        Thorsten Leemhuis <regressions@...mhuis.info>,
        Orlando Chamberlain <redecorating@...tonmail.com>,
        Daniel Winkler <danielwinkler@...gle.com>,
        Johan Hedberg <johan.hedberg@...el.com>,
        "linux-bluetooth@...r.kernel.org" <linux-bluetooth@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        "regressions@...ts.linux.dev" <regressions@...ts.linux.dev>,
        "sonnysasaka@...omium.org" <sonnysasaka@...omium.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH v7 1/2] Bluetooth: add quirk disabling LE Read Transmit
 Power



> On 30-Nov-2021, at 5:11 PM, Greg KH <gregkh@...uxfoundation.org> wrote:
> 
> On Tue, Nov 30, 2021 at 11:38:58AM +0000, Aditya Garg wrote:
>> From: Aditya Garg <gargaditya08@...e.com>
>> 
>> Some devices have a bug causing them to not work if they query 
>> LE tx power on startup. Thus we add a quirk in order to not query it 
>> and default min/max tx power values to HCI_TX_POWER_INVALID.
>> 
>> Signed-off-by: Aditya Garg <gargaditya08@...e.com>
>> Reported-by: Orlando Chamberlain <redecorating@...tonmail.com>
>> Tested-by: Orlando Chamberlain <redecorating@...tonmail.com>
>> Link:
>> https://lore.kernel.org/r/4970a940-211b-25d6-edab-21a815313954@protonmail.com
>> Fixes: 7c395ea521e6 ("Bluetooth: Query LE tx power on startup")
>> ---
>> v7 :- Added Tested-by.
>> include/net/bluetooth/hci.h | 9 +++++++++
>> net/bluetooth/hci_core.c    | 3 ++-
>> 2 files changed, 11 insertions(+), 1 deletion(-)
>> 
>> diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
>> index 63065bc01b766c..383342efcdc464 100644
>> --- a/include/net/bluetooth/hci.h
>> +++ b/include/net/bluetooth/hci.h
>> @@ -246,6 +246,15 @@ enum {
>> 	 * HCI after resume.
>> 	 */
>> 	HCI_QUIRK_NO_SUSPEND_NOTIFIER,
>> +
>> +	/*
>> +	 * When this quirk is set, LE tx power is not queried on startup
>> +	 * and the min/max tx power values default to HCI_TX_POWER_INVALID.
>> +	 *
>> +	 * This quirk can be set before hci_register_dev is called or
>> +	 * during the hdev->setup vendor callback.
>> +	 */
>> +	HCI_QUIRK_BROKEN_READ_TRANSMIT_POWER,
>> };
>> 
>> /* HCI device flags */
>> diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
>> index 8d33aa64846b1c..434c6878fe9640 100644
>> --- a/net/bluetooth/hci_core.c
>> +++ b/net/bluetooth/hci_core.c
>> @@ -619,7 +619,8 @@ static int hci_init3_req(struct hci_request *req, unsigned long opt)
>> 			hci_req_add(req, HCI_OP_LE_READ_ADV_TX_POWER, 0, NULL);
>> 		}
>> 
>> -		if (hdev->commands[38] & 0x80) {
>> +		if ((hdev->commands[38] & 0x80) &&
>> +		!test_bit(HCI_QUIRK_BROKEN_READ_TRANSMIT_POWER, &hdev->quirks)) {
> 
> This line is still not properly formatted.
I hope its fine in the resent patch. I sent the patch as HTML by mistake.
> 
> Please always use scripts/checkpatch.pl to find issues like this.
> 
> thanks,
> 
> greg k-h