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Date:   Wed, 20 Jul 2022 22:07:23 +0800
From:   Zijun Hu <quic_zijuhu@...cinc.com>
To:     <marcel@...tmann.org>, <johan.hedberg@...il.com>,
        <luiz.dentz@...il.com>, <davem@...emloft.net>,
        <edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
        <luiz.von.dentz@...el.com>, <swyterzone@...il.com>,
        <quic_zijuhu@...cinc.com>
CC:     <linux-kernel@...r.kernel.org>, <linux-bluetooth@...r.kernel.org>,
        <netdev@...r.kernel.org>
Subject: [PATCH v1 1/3] Bluetooth: hci_sync: Remove HCI_QUIRK_BROKEN_ERR_DATA_REPORTING

Check feature bit "Erroneous Data Reporting" instead of quirk
HCI_QUIRK_BROKEN_ERR_DATA_REPORTING to decide if HCI command
HCI_Read|Write_Default_Erroneous_Data_Reporting work fine.

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.

ALL BT controller whose device driver set the quirk currently does not
enable the fearture bit as shown by below btmon log:

@ 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@...cinc.com>
Tested-by: Zijun Hu <quic_zijuhu@...cinc.com>
---
 include/net/bluetooth/hci.h | 12 +-----------
 net/bluetooth/hci_sync.c    |  7 ++-----
 2 files changed, 3 insertions(+), 16 deletions(-)

diff --git a/include/net/bluetooth/hci.h b/include/net/bluetooth/hci.h
index 4a45c48eb0d2..927f51b92854 100644
--- a/include/net/bluetooth/hci.h
+++ b/include/net/bluetooth/hci.h
@@ -228,17 +228,6 @@ enum {
 	 */
 	HCI_QUIRK_VALID_LE_STATES,
 
-	/* When this quirk is set, then erroneous data reporting
-	 * is ignored. This is mainly due to the fact that the HCI
-	 * Read Default Erroneous Data Reporting command is advertised,
-	 * but not supported; these controllers often reply with unknown
-	 * command and tend to lock up randomly. Needing a hard reset.
-	 *
-	 * This quirk can be set before hci_register_dev is called or
-	 * during the hdev->setup vendor callback.
-	 */
-	HCI_QUIRK_BROKEN_ERR_DATA_REPORTING,
-
 	/*
 	 * When this quirk is set, then the hci_suspend_notifier is not
 	 * registered. This is intended for devices which drop completely
@@ -497,6 +486,7 @@ 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 464a5e2c56fb..0b6987b37c03 100644
--- a/net/bluetooth/hci_sync.c
+++ b/net/bluetooth/hci_sync.c
@@ -3221,7 +3221,7 @@ 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,
@@ -3706,7 +3706,7 @@ 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)
@@ -3865,9 +3865,6 @@ static const struct {
 	HCI_QUIRK_BROKEN(STORED_LINK_KEY,
 			 "HCI Delete Stored Link Key command is advertised, "
 			 "but not supported."),
-	HCI_QUIRK_BROKEN(ERR_DATA_REPORTING,
-			 "HCI Read Default Erroneous Data Reporting command is "
-			 "advertised, but not supported."),
 	HCI_QUIRK_BROKEN(READ_TRANSMIT_POWER,
 			 "HCI Read Transmit Power Level command is advertised, "
 			 "but not supported."),
-- 
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