Received-SPF: pass (google.com: domain of linux-bluetooth+bounces-4443-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:40f1:3f00::1 as permitted sender) client-ip=2604:1380:40f1:3f00::1;
Message-ID: <70078624-d766-4db6-8ddb-511251baf0f2@marcan.st>
Date: Fri, 10 May 2024 12:13:30 +0900
Precedence: bulk
MIME-Version: 1.0
User-Agent: Mozilla Thunderbird
Subject: Re: [PATCH v1] Bluetooth: hci_sync: Use advertised PHYs on
 hci_le_ext_create_conn_sync
To: Luiz Augusto von Dentz <luiz.dentz@gmail.com>, Janne Grunau <j@jannau.net>
Cc: linux-bluetooth@vger.kernel.org, regressions@lists.linux.dev,
 asahi@lists.linux.dev
References: <20240405204037.3451091-1-luiz.dentz@gmail.com>
 <Zjz0atzRhFykROM9@robin>
 <CABBYNZLMODHp+jBu2oVDC5Pg6fyAKJugQF0N-XgarjWQJJPObg@mail.gmail.com>
 <Zj0tcmseJCjR4hK2@robin>
 <CABBYNZLnYz-vPrMbtsJTsLPsyo62j+cxctSkLjRom3bWEU9N3A@mail.gmail.com>
 <CABBYNZJ-6oyLnBov9H_jym9m-9qiUt1ELxYGuBOdZT29aj9MCA@mail.gmail.com>
Content-Language: en-US
From: Hector Martin <marcan@marcan.st>
In-Reply-To: <CABBYNZJ-6oyLnBov9H_jym9m-9qiUt1ELxYGuBOdZT29aj9MCA@mail.gmail.com>
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit

Hi,

On 2024/05/10 7:41, Luiz Augusto von Dentz wrote:
<snip>

> If I print the actual value then we got:
> 
> Primary PHY: Reserved (0x81)
> 
> I guess one needs to disregard the reserved range, well until they are
> no longer reserved then it will no longer work. Perhaps we should talk
> to broadcom to know what is up with using reserved values and if that
> is an apple thing then perhaps we could ask them to provide firmware
> that acts according to the spec.

Apple and Broadcom do not support Linux on this platform. The kernel has
to work with the existing firmware (which is the firmware macOS uses),
we don't get to request changes. If the firmware has quirks the kernel
has to deal with it, that's how it goes. It would be great if we had
vendor support, but that is not something we can control. This is common
(Linux is full of quirks to support noncompliant hardware/firmware).

- Hector