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More expeirmentation suggests that 10ms isn't as reliable as

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previously thought, but 100ms seems to be.  Likely there's a good
middle ground, but for now be conservative.
This commit is contained in:
Warner Losh 2011-06-18 03:16:51 +00:00
parent 0b96c05a7a
commit cf95dbae06
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=223219
1 changed files with 2 additions and 2 deletions
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4
sys/dev/pccbb/pccbb.c
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@ -811,14 +811,14 @@ cbb_power(device_t brdev, int volts)
mtx_unlock(&sc->mtx);
/*
* Relax for 10ms. Some bridges appear to assert this signal
* Relax for 100ms. Some bridges appear to assert this signal
* right away, but before the card has stabilized. Other
* cards need need more time to cope up reliabily.
* Experiments with troublesome setups show this to be a
* "cheap" way to enhance reliabilty. We need not do this for
* "off" since we don't touch the card after we turn it off.
*/
pause("cbbPwr", min(hz / 100, 1));
pause("cbbPwr", min(hz / 10, 1));
/*
* The TOPIC95B requires a little bit extra time to get its