linux-kernel - Re: [PATCH 2/6] btbcm: disable read tx power for MacBook Pro 16,1 (16 inch, 2019)

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Date:   Mon, 29 Nov 2021 08:42:53 +0000
From:   Aditya Garg <gargaditya08@...e.com>
To:     Marcel Holtmann <marcel@...tmann.org>
CC:     Thorsten Leemhuis <regressions@...mhuis.info>,
        Orlando Chamberlain <redecorating@...tonmail.com>,
        Daniel Winkler <danielwinkler@...gle.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        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 2/6] btbcm: disable read tx power for MacBook Pro 16,1 (16
 inch, 2019)



> On 29-Nov-2021, at 1:52 PM, Marcel Holtmann <marcel@...tmann.org> wrote:
> 
> Hi Aditya,
> 
>>>> Bluetooth on Apple MacBook Pro 16,1 is unable to start due to LE Min/Max Tx Power being queried on startup. Add a DMI based quirk so that it is disabled.
>>> 
>>> list all the MacBooks that you found problematic right now. We add the
>>> initial as a large batch instead of all individual.
>>> 
>>>> 
>>>> Signed-off-by: Aditya Garg <gargaditya08@...e.com>
>>>> Tested-by: Aditya Garg <gargaditya08@...e.com>
>>>> ---
>>>> drivers/bluetooth/btbcm.c | 20 ++++++++++++++++++++
>>>> 1 file changed, 20 insertions(+)
>>>> 
>>>> diff --git a/drivers/bluetooth/btbcm.c b/drivers/bluetooth/btbcm.c
>>>> index e4182acee488c5..c1b0ca63880a68 100644
>>>> --- a/drivers/bluetooth/btbcm.c
>>>> +++ b/drivers/bluetooth/btbcm.c
>>>> @@ -8,6 +8,7 @@
>>>> 
>>>> #include <linux/module.h>
>>>> #include <linux/firmware.h>
>>>> +#include <linux/dmi.h>
>>>> #include <asm/unaligned.h>
>>>> 
>>>> #include <net/bluetooth/bluetooth.h>
>>>> @@ -343,9 +344,23 @@ static struct sk_buff *btbcm_read_usb_product(struct hci_dev *hdev)
>>>> 	return skb;
>>>> }
>>>> 
>>>> +static const struct dmi_system_id disable_broken_read_transmit_power[] = {
>>>> +	{
>>>> +		/* Match for Apple MacBook Pro 16,1 which needs
>>>> +		 * Read LE Min/Max Tx Power to be disabled.
>>>> +		 */
>>> 
>>> Actually leave the comment out. You are not adding any value that isn’t
>>> already in the variable name or the DMI. It is just repeating the obvious.
>> Alright, I prepare the patches into a single one
> 
> two patches, one for adding the quirk to the core and one for adjusting the driver.
Sent
> 
> Regards
> 
> Marcel
>