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From: Aditya Garg <gargaditya08@live.com>
To: Thorsten Leemhuis <regressions@leemhuis.info>
Cc: Marcel Holtmann <marcel@holtmann.org>,
	Orlando Chamberlain <redecorating@protonmail.com>,
	Daniel Winkler <danielwinkler@google.com>,
	Greg KH <gregkh@linuxfoundation.org>,
	Johan Hedberg <johan.hedberg@intel.com>,
	"linux-bluetooth@vger.kernel.org"
	<linux-bluetooth@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Luiz Augusto von Dentz <luiz.dentz@gmail.com>,
	"regressions@lists.linux.dev" <regressions@lists.linux.dev>,
	"sonnysasaka@chromium.org" <sonnysasaka@chromium.org>
Subject: Re: [PATCHv2] Bluetooth: quirk disabling LE Read Transmit Power
Date: Fri, 26 Nov 2021 15:15:59 +0000	[thread overview]
Message-ID: <D9375D91-1062-4265-9DE9-C7CF2B705F3F@live.com> (raw)
In-Reply-To: <332a19f1-30f0-7058-ac18-c21cf78759bb@leemhuis.info>



> On 25-Nov-2021, at 5:56 PM, Thorsten Leemhuis <regressions@leemhuis.info> wrote:
> 
> Hi, this is your Linux kernel regression tracker speaking again.
> 
> On 19.11.21 17:59, Aditya Garg wrote:
>>> On 18-Nov-2021, at 12:31 AM, Marcel Holtmann <marcel@holtmann.org> wrote:
>>>>> 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 impossible
>>>>> to detect clearly via DMI data or something like that?
>>>> 
>>>> 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 here
>>>> https://lore.kernel.org/linux-bluetooth/1D2217A9-EA73-4D93-8D0B-5BC2718D4788@holtmann.org/
>>>> 
>>>> This would catch some unaffected Macs, but they don't support the LE Read
>>>> Transmit Power command anyway (the affected macs were released after it
>>>> was added to the Bluetooth spec, while the unaffected Macs were released
>>>> before it was added to the spec, and thus don't support it).
>>>> 
>>>> I'm not sure how to go about applying a quirk based off this, there are
>>>> 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.
>>>> 
>>>> It might be simpler to make it ignore the Unknown Command error, like
>>>> in this patch https://lore.kernel.org/linux-bluetooth/CABBYNZLjSfcG_KqTEbL6NOSvHhA5-b1t_S=3FQP4=GwW21kuzg@mail.gmail.com/
>>>> however that only applies on bluetooth-next and needed the status it
>>>> checks for to be -56, not 0x01.
>>> 
>>> so we abstain from try-and-error sending of commands. The Bluetooth spec
>>> has a list of supported commands that a host can query for a reason. This
>>> 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 do really wish to get this regression fixed soon.
>>> 
>>> The question is just how we quirk it.
> 
> 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 power on 16,1. I have tested this on my 16,1 successfully. Still consider this 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 yes, I shall send the final patch.

From 3dab2e1e9e0b266574f5f010efc6680417fb0c61 Mon Sep 17 00:00:00 2001
From: Aditya Garg <gargaditya08@live.com>
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 <linux/property.h>
 #include <linux/suspend.h>
 #include <linux/wait.h>
+#include <linux/dmi.h>
 #include <asm/unaligned.h>
 
 #include <net/bluetooth/bluetooth.h>
@@ -461,9 +462,23 @@ static void hci_set_event_mask_page_2(struct hci_request *req)
 			    sizeof(events), events);
 }
 
+static const struct dmi_system_id fix_up_apple_bluetooth[] = {
+	{
+		/* Match for Apple MacBook Pro 16 inch, 2019 which needs
+		 * read transmit power to be disabled
+		 */
+		.matches = {
+			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 = req->hdev;
+	const struct dmi_system_id *dmi_id;
 	u8 p;
 
 	hci_setup_event_mask(req);
@@ -619,7 +634,8 @@ 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) {
+		dmi_id = 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);
> 
> Ciao, Thorsten
> 
> #regzbot title bluetooth: "Query LE tx power on startup" broke Bluetooth
> on MacBookPro16,1
> #regzbot poke


  reply	other threads:[~2021-11-26 15:16 UTC|newest]

Thread overview: 87+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-29  5:09 [regression] Bluetooth: Query LE tx power on startup broke Bluetooth on MacBookPro16,1 Orlando Chamberlain
2021-09-29  5:56 ` Thorsten Leemhuis
2021-09-30  6:32 ` Orlando Chamberlain
2021-09-30  6:51   ` Greg KH
2021-09-30 14:13   ` [PATCH] Bluetooth: add quirk disabling query LE tx power Orlando Chamberlain
2021-09-30 17:03     ` Thorsten Leemhuis
2021-09-30 17:58     ` Marcel Holtmann
2021-10-01  3:37       ` Orlando Chamberlain
2021-10-01  8:36         ` [PATCHv2] Bluetooth: quirk disabling LE Read Transmit Power Orlando Chamberlain
2021-10-01  9:35           ` Marcel Holtmann
2021-10-01 13:28             ` Orlando Chamberlain
2021-10-04 11:15               ` Orlando Chamberlain
2021-11-05 13:39                 ` Thorsten Leemhuis
2021-11-05 21:47           ` Luiz Augusto von Dentz
2021-11-06  9:41             ` Aditya Garg
2021-11-06 11:49               ` Greg KH
2021-11-06 17:27                 ` Aditya Garg
2021-11-07  8:35                   ` Greg KH
2021-11-16  8:18                     ` Thorsten Leemhuis
2021-11-16  9:02                       ` Orlando Chamberlain
2021-11-16  9:26                         ` Thorsten Leemhuis
2021-11-17  3:28                           ` Aditya Garg
2021-11-17  7:25                             ` Greg KH
2021-11-17  9:26                               ` Aditya Garg
2021-11-17  9:42                                 ` Thorsten Leemhuis
2021-11-17  9:59                                   ` Aditya Garg
2021-11-17 12:48                                   ` Orlando Chamberlain
2021-11-17 19:01                                     ` Marcel Holtmann
2021-11-19 16:59                                       ` Aditya Garg
2021-11-25 12:26                                         ` Thorsten Leemhuis
2021-11-26 15:15                                           ` Aditya Garg [this message]
2021-11-29  7:12                                             ` Aditya Garg
2021-11-29  7:22                                             ` [PATCH 1/6] Bluetooth: add " Aditya Garg
2021-11-29  7:27                                               ` [PATCH 2/6] btbcm: disable read tx power for MacBook Pro 16,1 (16 inch, 2019) Aditya Garg
2021-11-29  7:28                                                 ` [PATCH 3/6] btbcm: disable read tx power for MacBook Pro 16,2 (13 inch - 4 Thunderbolt Ports, 2020) Aditya Garg
2021-11-29  7:30                                                   ` [PATCH 4/6] btbcm: disable read tx power for MacBook Pro 16,4 (16 inch, 2019) Aditya Garg
2021-11-29  7:31                                                     ` [PATCH 5/6] btbcm: disable read tx power for iMac 20,1 (Retina 5K, 27-inch, 2020) Aditya Garg
2021-11-29  7:32                                                       ` [PATCH 6/6] btbcm: disable read tx power for iMac 20,2 " Aditya Garg
2021-11-29  7:46                                                     ` [PATCH v2 4/6] btbcm: disable read tx power for MacBook Pro 16,4 (16 inch, 2019) Aditya Garg
2021-11-29  7:45                                                   ` [PATCH v2 3/6] btbcm: disable read tx power for MacBook Pro 16,2 (13 inch - 4 Thunderbolt Ports, 2020) Aditya Garg
2021-11-29  7:44                                                 ` [PATCH v2 2/6] btbcm: disable read tx power for MacBook Pro 16,1 (16 inch, 2019) Aditya Garg
2021-11-29  8:08                                                 ` [PATCH " Marcel Holtmann
2021-11-29  8:11                                                   ` Aditya Garg
2021-11-29  8:22                                                     ` Marcel Holtmann
2021-11-29  8:42                                                       ` Aditya Garg
2021-11-29  7:32                                               ` [PATCH 1/6] Bluetooth: add quirk disabling LE Read Transmit Power Greg KH
2021-11-29  7:42                                                 ` [PATCH v2 " Aditya Garg
2021-11-29  7:47                                                   ` Greg KH
2021-11-29  7:49                                                     ` Aditya Garg
2021-11-29  7:47                                                   ` Greg KH
2021-11-29  8:05                                                   ` Marcel Holtmann
2021-11-29  8:32                                                     ` [PATCH v3 1/2] " Aditya Garg
2021-11-29  8:35                                                       ` [PATCH v3 2/2] btbcm: disable read tx power for affected Macs with the T2 Security chip Aditya Garg
2021-11-29  8:50                                                         ` [PATCH v3 resend " Aditya Garg
2021-11-29  9:05                                                           ` [PATCH v4 " Aditya Garg
2021-11-29  9:25                                                             ` [PATCH v5 " Aditya Garg
2021-11-29 11:03                                                           ` [PATCH v3 resend " Marcel Holtmann
2021-11-29 12:01                                                             ` Aditya Garg
2021-11-29  8:47                                                       ` [PATCH v3 resend 1/2] Bluetooth: add quirk disabling LE Read Transmit Power Aditya Garg
2021-11-29  9:03                                                         ` [PATCH v4 " Aditya Garg
2021-11-29  9:24                                                           ` [PATCH v5 " Aditya Garg
2021-11-29 13:59                                                             ` [PATCH v6 " Aditya Garg
2021-11-29 14:00                                                               ` [PATCH v6 2/2] btbcm: disable read tx power for affected Macs with the T2 Security chip Aditya Garg
2021-11-30  8:45                                                                 ` Aditya Garg
2021-11-30  8:54                                                                   ` Greg KH
2021-11-30 10:28                                                                 ` Orlando Chamberlain
2021-11-30 11:38                                                               ` [PATCH v7 1/2] Bluetooth: add quirk disabling LE Read Transmit Power Aditya Garg
2021-11-30 11:40                                                                 ` [PATCH v7 2/2] btbcm: disable read tx power for affected Macs with the T2 Security chip Aditya Garg
2021-11-30 11:41                                                                 ` [PATCH v7 1/2] Bluetooth: add quirk disabling LE Read Transmit Power Greg KH
2021-11-30 11:50                                                                   ` Aditya Garg
2021-11-30 11:48                                                                 ` [PATCH v7 resend " Aditya Garg
2021-11-30 11:49                                                                   ` [PATCH v7 resend 2/2] btbcm: disable read tx power for affected Macs with the T2 Security chip Aditya Garg
2021-11-30 12:03                                                                   ` [PATCH v7 resend 1/2] Bluetooth: add quirk disabling LE Read Transmit Power Greg KH
2021-11-30 12:53                                                                     ` Aditya Garg
2021-11-30 12:53                                                                   ` [PATCH v8 " Aditya Garg
2021-11-30 12:54                                                                     ` [PATCH v8 2/2] btbcm: disable read tx power for affected Macs with the T2 Security chip Aditya Garg
2021-12-01  7:25                                                                     ` [PATCH v8 1/2] Bluetooth: add quirk disabling LE Read Transmit Power Marcel Holtmann
2021-12-02 10:15                                                                     ` [PATCH v9 " Aditya Garg
2021-12-02 10:16                                                                       ` [PATCH v9 2/2] btbcm: disable read tx power for affected Macs with the T2 Security chip Aditya Garg
2021-12-02 12:41                                                                       ` [PATCH v10 1/2] Bluetooth: add quirk disabling LE Read Transmit Power Aditya Garg
2021-12-02 12:42                                                                         ` [PATCH v10 2/2] btbcm: disable read tx power for some Macs with the T2 Security chip Aditya Garg
2021-12-03 21:28                                                                           ` Marcel Holtmann
2021-12-21 13:44                                                                             ` Thorsten Leemhuis
2021-12-03 21:28                                                                         ` [PATCH v10 1/2] Bluetooth: add quirk disabling LE Read Transmit Power Marcel Holtmann
2021-11-29  8:52                                                       ` [PATCH v3 " Thorsten Leemhuis
2021-11-29 11:02                                                       ` Marcel Holtmann
2021-11-07  3:25             ` [PATCHv2] Bluetooth: " Orlando Chamberlain

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