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authorAdam Lee <adam.lee@canonical.com>2015-01-28 15:30:27 -0500
committerMarcel Holtmann <marcel@holtmann.org>2015-01-29 19:12:21 +0100
commitc561a5753dd631920c4459a067d22679b3d110d6 (patch)
treee36b9b3e99a65517c22c6eb461ac321d67ba30fd
parentac363cf9eb0b0378165ebfcf41ffbf78295a817e (diff)
downloadop-kernel-dev-c561a5753dd631920c4459a067d22679b3d110d6.zip
op-kernel-dev-c561a5753dd631920c4459a067d22679b3d110d6.tar.gz
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>
-rw-r--r--drivers/bluetooth/ath3k.c8
1 files changed, 8 insertions, 0 deletions
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 @@ 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)
@@ -207,6 +209,9 @@ 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);
@@ -304,6 +309,9 @@ 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);
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