[PATCH] Bluetooth: Patch for CYW4373 hci up fail issue

Nobuaki.Tsunashima
2024-05-16T05:08:28Z

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_Transmit_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[] = {
{ }
};

+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_power_by_chip_ver[] = {
+ {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 = 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 = &disable_broken_read_transmit_power_by_chip_ver[0];
+
+ for( i=0 ; i<table_size ; i++, entry++)
+ {
+ if( (chip_id == entry->chip_id) && (baseline == entry->baseline) )
+ return true;
+ }
+
+ return false;
+}
+
static int btbcm_read_info(struct hci_dev *hdev)
{
struct sk_buff *skb;
+ u8 chip_id;
+ u16 baseline;

/* Read Verbose Config Version Info */
skb = btbcm_read_verbose_config(hdev);
if (IS_ERR(skb))
return PTR_ERR(skb);
-
+ chip_id = skb->data[1];
+ baseline = skb->data[3] | (skb->data[4] << 8);
bt_dev_info(hdev, "BCM: chip id %u", skb->data[1]);
kfree_skb(skb);

+ /* 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;
}

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[] = {
{ USB_VENDOR_AND_INTERFACE_INFO(0x04ca, 0xff, 0x01, 0x01),
.driver_info = BTUSB_BCM_PATCHRAM },

+ /* Cypress devices with vendor specific id */
+ { USB_VENDOR_AND_INTERFACE_INFO(0x04b4, 0xff, 0x01, 0x01),
+ .driver_info = BTUSB_BCM_PATCHRAM },
+
/* Broadcom devices with vendor specific id */
{ USB_VENDOR_AND_INTERFACE_INFO(0x0a5c, 0xff, 0x01, 0x01),
.driver_info = BTUSB_BCM_PATCHRAM },
--
2.25.1