/*!
*
* @param mmio
* @param pipe_reg
* @param time_interval
*
* @return 0 on success
* @return 1 on failure
*/
int wait_for_vblank_timeout_plb(
unsigned char *mmio,
unsigned long pipe_reg,
unsigned long time_interval)
{
int ret;
unsigned long pipe_status_reg = pipe_reg + PIPE_STATUS_OFFSET;
unsigned long tmp;
os_alarm_t timeout;
unsigned long request_for;
EMGD_TRACE_ENTER;
EMGD_DEBUG("Parameters: MMIO = %p, pipe_reg = %lx, time_interval = %lx",
mmio, pipe_reg, time_interval);
/* If pipe is off then just return */
if(!((1L<<31) & EMGD_READ32(EMGD_MMIO(mmio) + pipe_reg))) {
EMGD_DEBUG("Pipe disabled/Off");
EMGD_TRACE_EXIT;
return 1;
}
/*
* When VGA plane is on the normal wait for vblank won't work
* so just skip it.
*/
if(!(EMGD_READ32(EMGD_MMIO(mmio) + 0x71400) & 0x80000000)) {
EMGD_DEBUG("VGA Plane On");
EMGD_TRACE_EXIT;
return 1;
}
/* 1. Request the interrupt handler to record the next VBlank: */
request_for = VBINT_REQUEST(VBINT_WAIT,
(pipe_status_reg == PIPEA_STAT) ? VBINT_PORT2 : VBINT_PORT4);
mode_context->dispatch->full->request_vblanks(request_for, mmio);
/* 2. Wait & poll for the next VBlank: */
timeout = OS_SET_ALARM(time_interval);
do {
OS_SCHEDULE();
tmp = mode_context->dispatch->full->vblank_occured(request_for);
} while ((tmp == 0x00) && (!OS_TEST_ALARM(timeout)));
if (tmp == 0) {
EMGD_ERROR_EXIT("Timeout waiting for VBLANK");
ret = 0;
} else {
ret = 1;
}
/* 3. End our request for the next VBlank: */
mode_context->dispatch->full->end_request(request_for, mmio);
EMGD_TRACE_EXIT;
return ret;
} /* wait_for_vblank_timeout_plb */
/*!
* Function to sleep in micro seconds. This can be called with millisecond
* ranges.
*
* @param usec
*
* @return void
*/
void igd_pd_usleep(unsigned long usec)
{
if (usec <= 1000) {
OS_SLEEP(usec);
} else {
os_alarm_t alarm = OS_SET_ALARM((usec+999)/1000);
do {
OS_SCHEDULE();
} while (!OS_TEST_ALARM(alarm));
}
} /* end igd_pd_usleep() */