Re: [PATCH v2] Bluetooth: btusb: Add a new quirk to skip HCI_FLT_CLEAR_ALL on fake CSR controllers
From: Paul Menzel
Date: Tue Jan 18 2022 - 07:16:18 EST
Dear Ismael,
Thank you for working on fixing these controllers. Just a nit, to make
the commit message summary a little shorter, you can just write:
Add quirk to skip HCI_FLT_CLEAR_ALL on fake CSR controllers
Am 18.01.22 um 08:14 schrieb Ismael Ferreras Morezuelas:
Another subset of the more recent batch of Chinese clones aren't
specs-compliant and seem to lock up whenever they receive a
HCI_OP_SET_EVENT_FLT with flt_type set to zero/HCI_FLT_CLEAR_ALL,
which on Linux happens right at BR/EDR setup.
So, while all the previous efforts to wrangle the herd of fake CSRs
seem to be paying off (and these also get detected as such) we
still need to take care of this quirk; testers seem to agree
that these dongles tend to work well enough afterwards.
From some cursory USB packet capture on Windows it seems like
that driver doesn't appear to use this clear-all functionality at all.
This patch was tested on some really popular AliExpress-style
dongles, in my case marked as "V5.0". Chip markings: UG8413,
the backside of the PCB says "USB Dangel" (sic).
Here is the `hciconfig -a` output; for completeness:
hci0: Type: Primary Bus: USB
BD Address: 00:1A:7D:DA:7X:XX ACL MTU: 679:8 SCO MTU: 48:16
UP RUNNING PSCAN ISCAN
Features: 0xbf 0x3e 0x4d 0xfa 0xdb 0x3d 0x7b 0xc7
Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
Link policy: RSWITCH SNIFF
Link mode: PERIPHERAL ACCEPT
Name: 'CSR8510 A10.'
Class: 0x7c0104
Service Classes: Rendering, Capturing, Object Transfer, Audio, Telephony
Device Class: Computer, Desktop workstation
HCI Version: 4.0 (0x6) Revision: 0x3120
LMP Version: 4.0 (0x6) Subversion: 0x22bb
Manufacturer: Cambridge Silicon Radio (10)
As well as the `lsusb -vv -d 0a12:0001`:
ID 0a12:0001 Cambridge Silicon Radio, Ltd Bluetooth Dongle (HCI mode)
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 224 Wireless
bDeviceSubClass 1 Radio Frequency
bDeviceProtocol 1 Bluetooth
bMaxPacketSize0 64
idVendor 0x0a12 Cambridge Silicon Radio, Ltd
idProduct 0x0001 Bluetooth Dongle (HCI mode)
bcdDevice 88.91
iManufacturer 0
iProduct 2 BT DONGLE10
iSerial 0
bNumConfigurations 1
Also, changed the benign dmesg print that shows up whenever the
generic force-suspend fails from bt_dev_err to bt_dev_warn;
it's okay and done on a best-effort basis, not a problem
if that does not work.
If there are more iterations, you might want to split that one into a
separate commit.
Also, swapped the HCI subver and LMP subver numbers for the Barrot
in the comment, which I copied wrong the last time around.
Fixes: 81cac64ba258a ("Bluetooth: Deal with USB devices that are faking CSR vendor")
Fixes: cde1a8a992875 ("Bluetooth: btusb: Fix and detect most of the Chinese Bluetooth controllers")
Fixes: d74e0ae7e0303 ("Bluetooth: btusb: Fix detection of some fake CSR controllers with a bcdDevice val of 0x0134")
Fixes: 0671c0662383e ("Bluetooth: btusb: Add workaround for remote-wakeup issues with Barrot 8041a02 fake CSR controllers")
Fixes: f4292e2faf522 ("Bluetooth: btusb: Make the CSR clone chip force-suspend workaround more generic")
https://bugzilla.kernel.org/show_bug.cgi?id=60824
The tags Link and BugLink exist (in `scripts/checkpatch.pl`), and you
might want to use these tags.
The bug report is from 2013 and talks about a regression upgrading from
Linux 3.9 to 3.11. Was the bug report repurposed, or is the original
issue also fixed by your change?
https://gist.github.com/nevack/6b36b82d715dc025163d9e9124840a07
Cc: stable@xxxxxxxxxxxxxxx
Cc: Hans de Goede <hdegoede@xxxxxxxxxx>
Tested-by: Gonzalo Tornaría <tornaria@xxxxxxxxxxx>
Tested-by: Mateus Lemos <lemonsmateus@xxxxxxxxx>
Tested-by: Ismael Ferreras Morezuelas <swyterzone@xxxxxxxxx>
Signed-off-by: Ismael Ferreras Morezuelas <swyterzone@xxxxxxxxx>
---
Changes for v2:
* Added HCI_QUIRK_NO_SUSPEND_NOTIFIER to btusb_setup_csr().
In theory we already disable runtime suspend in btusb, button
better safe than sorry. Doesn't hurt to explicitly avoid the
hci_suspend_dev() codepath, it also works as example.
* Improved the quirk description in hci.h, as suggested by Hans
de Goede. Explain the need to disable runtime suspend.
* Also check for the quirk in hci_req_set_event_filter();
mirror its hci_req_clear_event_filter() counterpart.
* The struct hci_dev *hdev variables always go first.
* Removed some misc formatting changes.
The dongles still seem all peachy after the v2 changes. :)
drivers/bluetooth/btusb.c | 6 ++++--
include/net/bluetooth/hci.h | 10 ++++++++++
net/bluetooth/hci_core.c | 11 ++++++++---
net/bluetooth/hci_request.c | 13 ++++++++++---
4 files changed, 32 insertions(+), 8 deletions(-)
diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index 75c83768c..c3bfb9bbe 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -1932,6 +1932,8 @@ static int btusb_setup_csr(struct hci_dev *hdev)
*/
set_bit(HCI_QUIRK_BROKEN_STORED_LINK_KEY, &hdev->quirks);
set_bit(HCI_QUIRK_BROKEN_ERR_DATA_REPORTING, &hdev->quirks);
+ set_bit(HCI_QUIRK_BROKEN_FILTER_CLEAR_ALL, &hdev->quirks);
+ set_bit(HCI_QUIRK_NO_SUSPEND_NOTIFIER, &hdev->quirks);
/* Clear the reset quirk since this is not an actual
* early Bluetooth 1.1 device from CSR.
@@ -1942,7 +1944,7 @@ static int btusb_setup_csr(struct hci_dev *hdev)
/*
* Special workaround for these BT 4.0 chip clones, and potentially more:
*
- * - 0x0134: a Barrot 8041a02 (HCI rev: 0x1012 sub: 0x0810)
+ * - 0x0134: a Barrot 8041a02 (HCI rev: 0x0810 sub: 0x1012)
* - 0x7558: IC markings FR3191AHAL 749H15143 (HCI rev/sub-version: 0x0709)
*
* These controllers are really messed-up.
@@ -1971,7 +1973,7 @@ static int btusb_setup_csr(struct hci_dev *hdev)
if (ret >= 0)
msleep(200);
else
- bt_dev_err(hdev, "CSR: Failed to suspend the device for our Barrot 8041a02 receive-issue workaround");
+ bt_dev_warn(hdev, "CSR: Couldn't suspend the device for our Barrot 8041a02 receive-issue workaround");
pm_runtime_forbid(&data->udev->dev);
diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
index 63065bc01..a17b8453a 100644
--- a/include/net/bluetooth/hci.h
+++ b/include/net/bluetooth/hci.h
@@ -246,6 +246,16 @@ enum {
* HCI after resume.
*/
HCI_QUIRK_NO_SUSPEND_NOTIFIER,
+
+ /* When this quirk is set, HCI_OP_SET_EVENT_FLT requests with
+ * HCI_FLT_CLEAR_ALL are ignored and event filtering is
+ * completely avoided. A subset of the CSR controller
+ * clones struggle with this and instantly lock up.
+ *
+ * Note that devices using this must (separately) disable
+ * runtime suspend, because event filtering takes place there.
+ */
+ HCI_QUIRK_BROKEN_FILTER_CLEAR_ALL,
};
/* HCI device flags */
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 8d33aa648..51d53c476 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -148,6 +148,7 @@ static int hci_init1_req(struct hci_request *req, unsigned long opt)
static void bredr_setup(struct hci_request *req)
{
+ struct hci_dev *hdev = req->hdev;
__le16 param;
__u8 flt_type;
@@ -169,9 +170,13 @@ static void bredr_setup(struct hci_request *req)
/* Read Current IAC LAP */
hci_req_add(req, HCI_OP_READ_CURRENT_IAC_LAP, 0, NULL);
- /* Clear Event Filters */
- flt_type = HCI_FLT_CLEAR_ALL;
- hci_req_add(req, HCI_OP_SET_EVENT_FLT, 1, &flt_type);
+ /* Clear Event Filters; some fake CSR controllers lock up after setting
+ * this type of filter, so avoid sending the request altogether.
+ */
+ if (!test_bit(HCI_QUIRK_BROKEN_FILTER_CLEAR_ALL, &hdev->quirks)) {
+ flt_type = HCI_FLT_CLEAR_ALL;
+ hci_req_add(req, HCI_OP_SET_EVENT_FLT, 1, &flt_type);
+ }
/* Connection accept timeout ~20 secs */
param = cpu_to_le16(0x7d00);
diff --git a/net/bluetooth/hci_request.c b/net/bluetooth/hci_request.c
index 92611bfc0..c417325fe 100644
--- a/net/bluetooth/hci_request.c
+++ b/net/bluetooth/hci_request.c
@@ -979,12 +979,16 @@ void hci_req_add_le_passive_scan(struct hci_request *req)
static void hci_req_clear_event_filter(struct hci_request *req)
{
+ struct hci_dev *hdev = req->hdev;
struct hci_cp_set_event_filter f;
- if (!hci_dev_test_flag(req->hdev, HCI_BREDR_ENABLED))
+ if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED))
+ return;
+
+ if (test_bit(HCI_QUIRK_BROKEN_FILTER_CLEAR_ALL, &hdev->quirks))
return;
- if (hci_dev_test_flag(req->hdev, HCI_EVENT_FILTER_CONFIGURED)) {
+ if (hci_dev_test_flag(hdev, HCI_EVENT_FILTER_CONFIGURED)) {
memset(&f, 0, sizeof(f));
f.flt_type = HCI_FLT_CLEAR_ALL;
hci_req_add(req, HCI_OP_SET_EVENT_FLT, 1, &f);
@@ -993,15 +997,18 @@ static void hci_req_clear_event_filter(struct hci_request *req)
static void hci_req_set_event_filter(struct hci_request *req)
{
+ struct hci_dev *hdev = req->hdev;
struct bdaddr_list_with_flags *b;
struct hci_cp_set_event_filter f;
- struct hci_dev *hdev = req->hdev;
u8 scan = SCAN_DISABLED;
bool scanning = test_bit(HCI_PSCAN, &hdev->flags);
if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED))
return;
+ if (test_bit(HCI_QUIRK_BROKEN_FILTER_CLEAR_ALL, &hdev->quirks))
+ return;
+
/* Always clear event filter when starting */
hci_req_clear_event_filter(req);
Acked-by: Paul Menzel <pmenzel@xxxxxxxxxxxxx>
Kind regards,
Paul