Bluetooth: ath3k: workaround the compatibility issue with xHCI controller
BugLink: https://bugs.launchpad.net/bugs/1400215
ath3k devices fail to load firmwares on xHCI buses, but work well on
EHCI, this might be a compatibility issue between xHCI and ath3k chips.
As my testing result, those chips will work on xHCI buses again with
this patch.
This workaround is from Qualcomm, they also did some workarounds in
Windows driver.
Signed-off-by: Adam Lee <adam.lee@canonical.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
diff --git a/drivers/bluetooth/ath3k.c b/drivers/bluetooth/ath3k.c
index 13a64d0..de4c849 100644
--- a/drivers/bluetooth/ath3k.c
+++ b/drivers/bluetooth/ath3k.c
@@ -176,6 +176,8 @@
#define USB_REQ_DFU_DNLOAD 1
#define BULK_SIZE 4096
#define FW_HDR_SIZE 20
+#define TIMEGAP_USEC_MIN 50
+#define TIMEGAP_USEC_MAX 100
static int ath3k_load_firmware(struct usb_device *udev,
const struct firmware *firmware)
@@ -207,6 +209,9 @@
pipe = usb_sndbulkpipe(udev, 0x02);
while (count) {
+ /* workaround the compatibility issue with xHCI controller*/
+ usleep_range(TIMEGAP_USEC_MIN, TIMEGAP_USEC_MAX);
+
size = min_t(uint, count, BULK_SIZE);
memcpy(send_buf, firmware->data + sent, size);
@@ -304,6 +309,9 @@
pipe = usb_sndbulkpipe(udev, 0x02);
while (count) {
+ /* workaround the compatibility issue with xHCI controller*/
+ usleep_range(TIMEGAP_USEC_MIN, TIMEGAP_USEC_MAX);
+
size = min_t(uint, count, BULK_SIZE);
memcpy(send_buf, firmware->data + sent, size);