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@xxxxxxxxxxxxx> Signed-off-by: Marcel Holtmann <marcel@xxxxxxxxxxxx> (cherry picked from commit c561a5753dd631920c4459a067d22679b3d110d6) --- drivers/bluetooth/ath3k.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/bluetooth/ath3k.c b/drivers/bluetooth/ath3k.c index 086240c..f2b945d 100644 --- a/drivers/bluetooth/ath3k.c +++ b/drivers/bluetooth/ath3k.c @@ -170,6 +170,8 @@ static const struct usb_device_id ath3k_blist_tbl[] = { #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) @@ -201,6 +203,9 @@ static int ath3k_load_firmware(struct usb_device *udev, 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); @@ -298,6 +303,9 @@ static int ath3k_load_fwfile(struct usb_device *udev, 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); -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html