HI,
I use the following code to enable portsc of uhci
under DOS,but the port enable failed (set the bit but
it doesn`t take effect) , I don't know why . Is there
anyone know what's the problem ? Thanks :)
static void uhci_reset_port(unsigned int port)
{
unsigned short status;
status = inw(port);
outw(status | USBPORTSC_PR, port); /* reset port */
wait_ms(10);
outw(status & ~USBPORTSC_PR, port);
udelay(5);
status = inw(port);
outw(status | USBPORTSC_PE, port); /* enable port */
wait_ms(10);
status = inw(port);
if(!(status & USBPORTSC_PE)) {
outw(status | USBPORTSC_PE, port); /* one more try
at enabling port */
wait_ms(50);
}
}
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