[PATCH AUTOSEL 5.18 77/93] Bluetooth: hci_sync: Check LMP feature bit instead of quirk

Sasha Levin
2022-08-11T16:09:46Z

From: Zijun Hu <quic_zijuhu@quicinc.com>

[ Upstream commit 766ae2422b4312a73510ebee9266bc23b466fbbb ]

BT core driver should addtionally check LMP feature bit
"Erroneous Data Reporting" instead of quirk
HCI_QUIRK_BROKEN_ERR_DATA_REPORTING set by BT device driver to decide if
HCI commands HCI_Read|Write_Default_Erroneous_Data_Reporting are broken.

BLUETOOTH CORE SPECIFICATION Version 5.3 | Vol 2, Part C | page 587
This feature indicates whether the device is able to support the
Packet_Status_Flag and the HCI commands HCI_Write_Default_-
Erroneous_Data_Reporting and HCI_Read_Default_Erroneous_-
Data_Reporting.

the quirk was introduced by 'commit cde1a8a99287 ("Bluetooth: btusb: Fix
and detect most of the Chinese Bluetooth controllers")' to mark HCI
commands HCI_Read|Write_Default_Erroneous_Data_Reporting broken by BT
device driver, but the reason why these two HCI commands are broken is
that feature "Erroneous Data Reporting" is not enabled by firmware, this
scenario is illustrated by below log of QCA controllers with USB I/F:

@ RAW Open: hcitool (privileged) version 2.22
< HCI Command: Read Local Supported Commands (0x04|0x0002) plen 0
> HCI Event: Command Complete (0x0e) plen 68
Read Local Supported Commands (0x04|0x0002) ncmd 1
Status: Success (0x00)
Commands: 288 entries
......
Read Default Erroneous Data Reporting (Octet 18 - Bit 2)
Write Default Erroneous Data Reporting (Octet 18 - Bit 3)
......

< HCI Command: Read Default Erroneous Data Reporting (0x03|0x005a) plen 0
> HCI Event: Command Complete (0x0e) plen 4
Read Default Erroneous Data Reporting (0x03|0x005a) ncmd 1
Status: Unknown HCI Command (0x01)

< HCI Command: Read Local Supported Features (0x04|0x0003) plen 0
> HCI Event: Command Complete (0x0e) plen 12
Read Local Supported Features (0x04|0x0003) ncmd 1
Status: Success (0x00)
Features: 0xff 0xfe 0x0f 0xfe 0xd8 0x3f 0x5b 0x87
3 slot packets
......

Signed-off-by: Zijun Hu <quic_zijuhu@quicinc.com>
Tested-by: Zijun Hu <quic_zijuhu@quicinc.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
include/net/bluetooth/hci.h | 1 +
net/bluetooth/hci_sync.c | 4 ++--
2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
index 62a9bb022aed..61051d9d53a2 100644
--- a/include/net/bluetooth/hci.h
+++ b/include/net/bluetooth/hci.h
@@ -496,6 +496,7 @@ enum {
#define LMP_EXT_INQ 0x01
#define LMP_SIMUL_LE_BR 0x02
#define LMP_SIMPLE_PAIR 0x08
+#define LMP_ERR_DATA_REPORTING 0x20
#define LMP_NO_FLUSH 0x40

#define LMP_LSTO 0x01
diff --git a/net/bluetooth/hci_sync.c b/net/bluetooth/hci_sync.c
index 351c2390164d..5c352db71819 100644
--- a/net/bluetooth/hci_sync.c
+++ b/net/bluetooth/hci_sync.c
@@ -3191,7 +3191,7 @@ static int hci_read_page_scan_activity_sync(struct hci_dev *hdev)
static int hci_read_def_err_data_reporting_sync(struct hci_dev *hdev)
{
if (!(hdev->commands[18] & 0x04) ||
- test_bit(HCI_QUIRK_BROKEN_ERR_DATA_REPORTING, &hdev->quirks))
+ !(hdev->features[0][6] & LMP_ERR_DATA_REPORTING))
return 0;

return __hci_cmd_sync_status(hdev, HCI_OP_READ_DEF_ERR_DATA_REPORTING,
@@ -3676,7 +3676,7 @@ static int hci_set_err_data_report_sync(struct hci_dev *hdev)
bool enabled = hci_dev_test_flag(hdev, HCI_WIDEBAND_SPEECH_ENABLED);

if (!(hdev->commands[18] & 0x08) ||
- test_bit(HCI_QUIRK_BROKEN_ERR_DATA_REPORTING, &hdev->quirks))
+ !(hdev->features[0][6] & LMP_ERR_DATA_REPORTING))
return 0;

if (enabled == hdev->err_data_reporting)
--
2.35.1