linux-kernel - Re: [PATCH v3 1/2] Bluetooth: add quirk disabling LE Read Transmit Power

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Message-Id: <516543B6-9C30-479E-AC9B-A658C836C703@holtmann.org>
Date:   Mon, 29 Nov 2021 12:02:23 +0100
From:   Marcel Holtmann <marcel@...tmann.org>
To:     Aditya Garg <gargaditya08@...e.com>
Cc:     Greg KH <gregkh@...uxfoundation.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 v3 1/2] Bluetooth: add quirk disabling LE Read Transmit
 Power

Hi Aditya,

> 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>
> ---
> 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)) {

		if ((hdev->commands[38] && 0x80) &&
		    !test_bit(HCI_QUIRK_.., &hdev->quirks)) {

> 			/* Read LE Min/Max Tx Power*/
> 			hci_req_add(req, HCI_OP_LE_READ_TRANSMIT_POWER,
> 				    0, NULL);
> 

Regards

Marcel