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Thu, 05 Nov 2026 22:05:27 -0800 (PST) Received: from macbookair ([150.203.68.27]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-8b3597f0161sm306194b3a.26.2026.11.05.22.05.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 05 Nov 2026 22:05:26 -0800 (PST) Date: Fri, 6 Nov 2026 17:05:19 +1100 From: Myria Sarvay To: Andre Eikmeyer Cc: marcel@holtmann.org, luiz.dentz@gmail.com, linux-bluetooth@vger.kernel.org, linux-kernel@vger.kernel.org, sven@kernel.org, j@jannau.net, neal@gompa.dev, asahi@lists.linux.dev, linux-arm-kernel@lists.infradead.org, Yossef Osman , Aditya Garg Subject: Re: [PATCH v2 1/2] Bluetooth: btbcm: raise ACL priority on Apple Broadcom controllers Message-ID: References: <20261105085750.120392-1-dev@deq.rocks> <20261105085750.120392-2-dev@deq.rocks> X-Mailing-List: linux-bluetooth@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20261105085750.120392-2-dev@deq.rocks> On Thu, Nov 05, 2026 at 09:57:49AM +0100, Andre Eikmeyer wrote: > On the MacBookPro15,1 (BCM4364B0 over UART) A2DP audio drops out as > soon as WLAN runs on 2.4 GHz with traffic. The host keeps the eight ACL > buffers of the controller filled, but the controller holds single ACL > packets for 160-200 ms, so the sink runs dry. > > Sending the Broadcom vendor command 0xfc57 (HCI_BRCM_SET_ACL_PRIORITY, > handle and priority, as used by the Android Broadcom vendor library) with > priority high for the audio link stops the dropouts. Setting it back to > normal brings them back right away. The BCM4377 of the MacBookAir9,1 > accepts the command as well. > > Raise the priority for every BR/EDR ACL link once its Connection Complete > event arrives. This covers audio as well as HID links. hci_bcm does this > on Apple machines only, hci_bcm4377 always, since it only runs on Apple > machines. The PCIe driver receives events in hard interrupt context, so > the command is queued from a work item. Hi Andre, Just wanted to point it out, if you hadn't seen it before, that Sasha has in the past sent a different patch [1] to run these priority commands. They seem to take a different approach to when to enable/run them. Wasn't sure if one was better or worse though. Thanks, Myria [1]: https://lore.kernel.org/asahi/20260525-brcm-prio-v3-1-6259e10233f8@chaosmail.tech/