On 09/09/2014 09:45 AM, Roger Quadros wrote:
[...]
>>> /* We look only at the bits of our instance. */
>>> val &= mask;
>>> - while ((readl(priv->raminit_ctrlreg) & mask) != val)
>>> + while ((readl(priv->raminit_ctrlreg) & mask) != val) {
>>> udelay(1);
>>> + timeout++;
>>> +
>>> + if (timeout == 1000) {
>>
>> How did we come up with this number?
>
> wild guess ;), that it should be set in a few microseconds and the delay is not too
> large.
>
> Till I don't hear from hardware guys, it will remain a guess.
>
in cases like these, I suggest using emperical data as point ->
example doing some 10,000 iterations of the operation and picking up
the worse case number and double it.
Either way, you need to document the same, else a few years down the
line, when that number is in question, no one will know what it's
basis was..
--
Regards,
Nishanth Menon
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