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DM USB: temporary solution for corner case of control transfer 

In the process of implementation for USB isochronous transfer, the
timeout (100ms) is not enough for Plantronics USB headset. So pass
longer timeout (300ms) to function libusb_control_transfer will
make USB headset of Plantronics work.

This change only results a longer execution time in ENUMERATION process
for few devices like Plantronics USB headset which need more time to do
its internal operations. For most USB devices, time less than 100ms are
enough to complete the execution of libusb_control_transfer. So basically
it will not affect the whole system performance.

In the long term, a better solution (eg: async control transfer) will be
introduced to replace current implementation.

Change-Id: I380e0cc337ec5741b1e4ce989abacce826b7dde4
Tracked-On:
Signed-off-by: Xiaoguang Wu <xiaoguang.wu@intel.com>
Reviewed-by: Liang Yang <liang3.yang@intel.com>
Acked-by: Yu Wang <yu1.wang@intel.com>
This commit is contained in:
Xiaoguang Wu 2018-07-18 18:32:17 +08:00 committed by lijinxia
parent 3389e83177
commit b95f93927b
1 changed files with 6 additions and 2 deletions
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8
devicemodel/hw/platform/usb_pmapper.c
View File

@ -772,9 +772,13 @@ usb_dev_request(void *pdata, struct usb_data_xfer *xfer)
}
/* send it to physical device */
/* TODO: should this be async operation? */
/* FIXME: In the process of implementation of USB isochronouse transfer,
* the timeout time is not enough for Plantronics headset. So this
* issue should be investigated detailly, and at worst situation, the
* control transfer should be also changed to async operation.
*/
rc = libusb_control_transfer(udev->handle, request_type, request,
value, index, data, len, 100);
value, index, data, len, 300);
if (rc >= 0 && blk) {
blk->blen = len - rc;