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Bluetooth: ath3k: workaround the compatibility issue with xHCI controller

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commit c561a5753d upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Adam Lee
2015-01-28 15:30:27 -05:00
committed by Greg Kroah-Hartman
parent ef16065a9e
commit 31e48a8de9
1 changed files with 8 additions and 0 deletions
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8
drivers/bluetooth/ath3k.c
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@@ -151,6 +151,8 @@ static 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)
@@ -181,6 +183,9 @@ static int ath3k_load_firmware(struct usb_device *udev,
count -= 20;
while (count) {
/* workaround the compatibility issue with xHCI controller*/
usleep_range(TIMEGAP_USEC_MIN, TIMEGAP_USEC_MAX);
size = min_t(uint, count, BULK_SIZE);
pipe = usb_sndbulkpipe(udev, 0x02);
memcpy(send_buf, firmware->data + sent, size);
@@ -277,6 +282,9 @@ static int ath3k_load_fwfile(struct usb_device *udev,
count -= size;
while (count) {
/* workaround the compatibility issue with xHCI controller*/
usleep_range(TIMEGAP_USEC_MIN, TIMEGAP_USEC_MAX);
size = min_t(uint, count, BULK_SIZE);
pipe = usb_sndbulkpipe(udev, 0x02);