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usb: dw: Add sleep before FIFO flash

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Adding sleep before TX FIFO flash fixes splitting networking packets
sent over USB endpoints making ECM broken since there is no flow
control other then frame sizes.

Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@intel.com>
This commit is contained in:
Andrei Emeltchenko 2017-10-24 12:32:55 +03:00 • committed by Anas Nashif
commit fe9dee0107
1 changed files with 3 additions and 1 deletions
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4
drivers/usb/device/usb_dc_dw.c
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@ -400,17 +400,19 @@ static int usb_dw_tx(u8_t ep, const u8_t *const data,
unsigned int key;
u32_t i;
key = irq_lock();
/* Check if FIFO space available */
avail_space = usb_dw_tx_fifo_avail(ep_idx);
if (avail_space != usb_dw_ctrl.in_ep_ctrl[ep_idx].fifo_size) {
SYS_LOG_DBG("USB IN EP%d fifo not empty: %d",
ep_idx, avail_space);
k_sleep(20);
usb_dw_flush_tx_fifo(ep_idx);
avail_space = usb_dw_tx_fifo_avail(ep_idx);
}
key = irq_lock();
avail_space *= 4;
if (!avail_space) {
SYS_LOG_ERR("USB IN EP%d no space available, DTXFSTS %x",