On Tue, Apr 07, 2020 at 11:01:14PM +0300, Souza, Jose wrote:
> [...]
> > > + } while (ret == -EAGAIN);
> >
> > Let's protect against an endless loop.
>
> const ktime_t timeout = ktime_add_ms(ktime_get_raw(), 3);
> int ret;
>
> do {
> ret = sandybridge_pcode_write_timeout(i915,
> ICL_PCODE_EXIT_TCCOLD,
> 0, 250, 1);
> } while (ret == -EAGAIN && ktime_compare(timeout, ktime_get_raw()) > 0);
Why not just a simple
trial = 0;
while (1) {
ret = pcode_write();
if (ret != -EAGAIN || ++trial == 3)
break;
msleep(1);
}
with the msleep(1), as if the PCODE run/busy flag didn't get cleared after
the 1ms polling, it probably doesn't make sense to retry in a tight loop.
--Imre
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