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Fri, 26 Nov 2021 15:15:59 +0000 Received: from PN2PR01MB4411.INDPRD01.PROD.OUTLOOK.COM ([fe80::152a:9391:5b99:13e8]) by PN2PR01MB4411.INDPRD01.PROD.OUTLOOK.COM ([fe80::152a:9391:5b99:13e8%6]) with mapi id 15.20.4734.023; Fri, 26 Nov 2021 15:15:59 +0000 From: Aditya Garg To: Thorsten Leemhuis CC: Marcel Holtmann , Orlando Chamberlain , Daniel Winkler , Greg KH , Johan Hedberg , "linux-bluetooth@vger.kernel.org" , "linux-kernel@vger.kernel.org" , Luiz Augusto von Dentz , "regressions@lists.linux.dev" , "sonnysasaka@chromium.org" Subject: Re: [PATCHv2] Bluetooth: quirk disabling LE Read Transmit Power Thread-Topic: [PATCHv2] Bluetooth: quirk disabling LE Read Transmit Power Thread-Index: AQHX0vJ15A6zQVMGfEiNGmUN6kF0hKv3vuGAgA4gSACAAAxJAIAABrOAgAEuUwCAAEInAIAAIdSAgAAEmwCAADPsAIAAaCCAgAMCoICACSHJgIABwZoA Date: Fri, 26 Nov 2021 15:15:59 +0000 Message-ID: References: <20211001083412.3078-1-redecorating@protonmail.com> <70a875d0-7162-d149-dbc1-c2f5e1a8e701@leemhuis.info> <20211116090128.17546-1-redecorating@protonmail.com> <3B8E16FA-97BF-40E5-9149-BBC3E2A245FE@live.com> <52DEDC31-EEB2-4F39-905F-D5E3F2BBD6C0@live.com> <8919a36b-e485-500a-2722-529ffa0d2598@leemhuis.info> <20211117124717.12352-1-redecorating@protonmail.com> <40550C00-4EE5-480F-AFD4-A2ACA01F9DBB@live.com> <332a19f1-30f0-7058-ac18-c21cf78759bb@leemhuis.info> In-Reply-To: <332a19f1-30f0-7058-ac18-c21cf78759bb@leemhuis.info> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-tmn: [woERxkV5XLI5WA7t55+1mvcAMm3vIlDesVa/AYpWSrtPYN2Ei005WxpdMe/kr32G] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: ee55d546-3470-456d-dfbc-08d9b0efa6f3 x-ms-traffictypediagnostic: PN1PR0101MB1294: x-microsoft-antispam: BCL:0; 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charset="us-ascii" Content-ID: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: sct-15-20-3174-20-msonline-outlook-a1a1a.templateTenant X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: PN2PR01MB4411.INDPRD01.PROD.OUTLOOK.COM X-MS-Exchange-CrossTenant-RMS-PersistedConsumerOrg: 00000000-0000-0000-0000-000000000000 X-MS-Exchange-CrossTenant-Network-Message-Id: ee55d546-3470-456d-dfbc-08d9b0efa6f3 X-MS-Exchange-CrossTenant-originalarrivaltime: 26 Nov 2021 15:15:59.3173 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 84df9e7f-e9f6-40af-b435-aaaaaaaaaaaa X-MS-Exchange-CrossTenant-rms-persistedconsumerorg: 00000000-0000-0000-0000-000000000000 X-MS-Exchange-Transport-CrossTenantHeadersStamped: PN1PR0101MB1294 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > On 25-Nov-2021, at 5:56 PM, Thorsten Leemhuis = wrote: >=20 > Hi, this is your Linux kernel regression tracker speaking again. >=20 > On 19.11.21 17:59, Aditya Garg wrote: >>> On 18-Nov-2021, at 12:31 AM, Marcel Holtmann wrot= e: >>>>> So if this just affects two macs, why can't the fix be realized as a >>>>> quirk that is only enabled on those two systems? Or are they impossib= le >>>>> to detect clearly via DMI data or something like that? >>>>=20 >>>> I think we should be able to quirk based off the acpi _CID "apple-uart= -blth" >>>> or _HID "BCM2E7C". Marcel suggested quirking based of the acpi table h= ere >>>> https://lore.kernel.org/linux-bluetooth/1D2217A9-EA73-4D93-8D0B-5BC271= 8D4788@holtmann.org/ >>>>=20 >>>> This would catch some unaffected Macs, but they don't support the LE R= ead >>>> Transmit Power command anyway (the affected macs were released after i= t >>>> was added to the Bluetooth spec, while the unaffected Macs were releas= ed >>>> before it was added to the spec, and thus don't support it). >>>>=20 >>>> I'm not sure how to go about applying a quirk based off this, there ar= e >>>> quirks in drivers/bluetooth/hci_bcm.c (no_early_set_baudrate and >>>> drive_rts_on_open), but they don't seem to be based off acpi ids. >>>>=20 >>>> It might be simpler to make it ignore the Unknown Command error, like >>>> in this patch https://lore.kernel.org/linux-bluetooth/CABBYNZLjSfcG_Kq= TEbL6NOSvHhA5-b1t_S=3D3FQP4=3DGwW21kuzg@mail.gmail.com/ >>>> however that only applies on bluetooth-next and needed the status it >>>> checks for to be -56, not 0x01. >>>=20 >>> so we abstain from try-and-error sending of commands. The Bluetooth spe= c >>> has a list of supported commands that a host can query for a reason. Th= is >>> is really broken behavior of the controller and needs to be pointed out= as >>> such. >> Well all I can do is provide you any logs or information I can. But we d= o really wish to get this regression fixed soon. >>>=20 >>> The question is just how we quirk it. >=20 > This thread once again looks stalled and smells a lot like "everyone > agrees that his should be fixed, but afaics nobody submitted a fix or > committed to work on one". Please speak up if my impression is wrong, as > this is a regression and thus needs to be fixed, ideally quickly. Part > of my job is to make that happen and thus remind developers and > maintainers about this until we have a fix. On the basis of DMI data, I have made this patch to disable read transmit p= ower on 16,1. I have tested this on my 16,1 successfully. Still consider th= is as a draft as more models have to be added. I am sending this to get the= approval of the maintainers whether this quirk is acceptable or not. If ye= s, I shall send the final patch. >From 3dab2e1e9e0b266574f5f010efc6680417fb0c61 Mon Sep 17 00:00:00 2001 From: Aditya Garg Date: Fri, 26 Nov 2021 18:28:46 +0530 Subject: [PATCH] Add quirk to disable read transmit power on MacBook Pro 16 inch, 2019 --- net/bluetooth/hci_core.c | 18 +++++++++++++++++- 1 file changed, 17 insertions(+), 1 deletion(-) diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c index 8d33aa64846b1c..d11064cb3666ef 100644 --- a/net/bluetooth/hci_core.c +++ b/net/bluetooth/hci_core.c @@ -32,6 +32,7 @@ #include #include #include +#include #include =20 #include @@ -461,9 +462,23 @@ static void hci_set_event_mask_page_2(struct hci_reque= st *req) sizeof(events), events); } =20 +static const struct dmi_system_id fix_up_apple_bluetooth[] =3D { + { + /* Match for Apple MacBook Pro 16 inch, 2019 which needs + * read transmit power to be disabled + */ + .matches =3D { + DMI_MATCH(DMI_BOARD_VENDOR, "Apple Inc."), + DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro16,1"), + }, + }, + { } +}; + static int hci_init3_req(struct hci_request *req, unsigned long opt) { struct hci_dev *hdev =3D req->hdev; + const struct dmi_system_id *dmi_id; u8 p; =20 hci_setup_event_mask(req); @@ -619,7 +634,8 @@ static int hci_init3_req(struct hci_request *req, unsig= ned long opt) hci_req_add(req, HCI_OP_LE_READ_ADV_TX_POWER, 0, NULL); } =20 - if (hdev->commands[38] & 0x80) { + dmi_id =3D dmi_first_match(fix_up_apple_bluetooth); + if (hdev->commands[38] & 0x80 && (!dmi_id)) { /* Read LE Min/Max Tx Power*/ hci_req_add(req, HCI_OP_LE_READ_TRANSMIT_POWER, 0, NULL); >=20 > Ciao, Thorsten >=20 > #regzbot title bluetooth: "Query LE tx power on startup" broke Bluetooth > on MacBookPro16,1 > #regzbot poke