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From: <Nobuaki.Tsunashima@infineon.com>
To: <marcel@holtmann.org>, <luiz.dentz@gmail.com>
CC: <linux-bluetooth@vger.kernel.org>
Subject: [PATCH] Bluetooth: Patch for CYW4373 hci up fail issue
Thread-Topic: [PATCH] Bluetooth: Patch for CYW4373 hci up fail issue
Thread-Index: AdqnTUe0gn8yrR5qRPOdTOn0GveE1w==
Date: Thu, 16 May 2024 05:08:26 +0000
Message-ID: <6267800d70ae4344acaba3486b54bc0c@infineon.com>
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CYW4373 ROM FW has an issue that it claims LE_Read_Transmit_Power command
as supported in a response of Read_Local_Supported_Command command but
rejects the LE_Read_Transmit_Power command with "Unknown HCI Command"
status.
Due to the issue, Bluetooth driver of 5.15 and later kernel fails to hci up=
.
Especially in USB i/f case, it would be difficult to download patch FW that=
 includes
Its fix unless hci is up. The patch forces the driver to skip LE_Read_Trans=
mit_Power
Command when it detects CYW4373 with ROM FW build.

Signed-off-by: Nobuaki Tsunashima <nobuaki.tsunashima@infineon.com>

---
 drivers/bluetooth/btbcm.c | 32 +++++++++++++++++++++++++++++++-
 drivers/bluetooth/btusb.c |  4 ++++
 2 files changed, 35 insertions(+), 1 deletion(-)

diff --git a/drivers/bluetooth/btbcm.c b/drivers/bluetooth/btbcm.c
index 0a5445ac5e1b..c64d1ddd140d 100644
--- a/drivers/bluetooth/btbcm.c
+++ b/drivers/bluetooth/btbcm.c
@@ -437,18 +437,48 @@ static const struct dmi_system_id disable_broken_read=
_transmit_power[] =3D {
 	{ }
 };
=20
+struct bcm_chip_version_table {
+	u8	chip_id;
+	u16 baseline;
+};
+#define BCM_ROMFW_BASELINE_NUM	0xFFFF
+static const struct bcm_chip_version_table disable_broken_read_transmit_po=
wer_by_chip_ver[] =3D {
+	{0x87, BCM_ROMFW_BASELINE_NUM}		/* CYW4373/4373E */
+};
+static bool btbcm_is_disable_broken_read_tx_power_by_chip_ver(u8 chip_id, =
u16 baseline)
+{
+	int i;
+	int table_size =3D sizeof(disable_broken_read_transmit_power_by_chip_ver)=
/sizeof(disable_broken_read_transmit_power_by_chip_ver[0]);
+	struct bcm_chip_version_table *entry =3D &disable_broken_read_transmit_po=
wer_by_chip_ver[0];
+
+	for( i=3D0 ; i<table_size ; i++, entry++)
+	{
+		if( (chip_id =3D=3D entry->chip_id) && (baseline =3D=3D entry->baseline)=
 )
+			return true;
+	}
+
+	return false;
+}
+
 static int btbcm_read_info(struct hci_dev *hdev)
 {
 	struct sk_buff *skb;
+	u8 chip_id;
+	u16 baseline;
=20
 	/* Read Verbose Config Version Info */
 	skb =3D btbcm_read_verbose_config(hdev);
 	if (IS_ERR(skb))
 		return PTR_ERR(skb);
-
+	chip_id =3D skb->data[1];
+	baseline =3D skb->data[3] | (skb->data[4] << 8);
 	bt_dev_info(hdev, "BCM: chip id %u", skb->data[1]);
 	kfree_skb(skb);
=20
+	/* Check Chip ID and disable broken Read LE Min/Max Tx Power */
+	if (btbcm_is_disable_broken_read_tx_power_by_chip_ver(chip_id, baseline))
+		set_bit(HCI_QUIRK_BROKEN_READ_TRANSMIT_POWER, &hdev->quirks);
+
 	return 0;
 }
=20
diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index d31edad7a056..52561c8d8828 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -142,6 +142,10 @@ static const struct usb_device_id btusb_table[] =3D {
 	{ USB_VENDOR_AND_INTERFACE_INFO(0x04ca, 0xff, 0x01, 0x01),
 	  .driver_info =3D BTUSB_BCM_PATCHRAM },
=20
+	/* Cypress devices with vendor specific id */
+	{ USB_VENDOR_AND_INTERFACE_INFO(0x04b4, 0xff, 0x01, 0x01),
+	  .driver_info =3D BTUSB_BCM_PATCHRAM },
+
 	/* Broadcom devices with vendor specific id */
 	{ USB_VENDOR_AND_INTERFACE_INFO(0x0a5c, 0xff, 0x01, 0x01),
 	  .driver_info =3D BTUSB_BCM_PATCHRAM },
--=20
2.25.1