On the Touch Book (which has the same transceiver as Beagleboard), we experience a similar problem with high speed USB. I'm playing with those various options and patches but it's not working so far. I'm then very interested to get any help on this problem too. More documentation about Smart Reflex would help, Grégoire On Sat, 2009-08-15 at 23:04 +0300, Siarhei Siamashka wrote: > On Saturday 15 August 2009, Frantisek Dufka wrote: > > Gerald Coley wrote: > > > You need to enable Smart Reflex on VDD2 in the Kernel. I can't seem to > > > get anyone around here to help me formalize exactly how to do this in > > > the Kernel. So if you can figure it out, I would go ahead and do it. If > > > you could please then post it to the community, that would be great. > > > > > > Gerald > > > > http://www.webos-internals.org/wiki/Patch_webOS_CPU_Frequency_or_Voltage_Sc > >aling#Enable_SmartReflex > > > > the file is there but after running > > echo -n 1 > /sys/power/sr_vdd2_autocomp > > there is still zero in the file and in kernel log I see > > OPP3 doesn't support SmartReflex > > SR2: VDD autocomp not activated > > > > Maybe different kernel would do. > > Would it make sense to ask for help in the linux-omap mailing list? > I guess Gerald has a reply from TI or a new errata list or something else > which says that "enabling Smart Reflex on VDD2" can workaround EHCI problem. > > Now somebody knowledgeable about kernel internals, OMAP3, Smart Reflex > and power management code in general could probably provide some hints > or even a patch to enable this bugfix in the kernel. Maybe the fix is even > sitting in somebody's branch already and we just don't know. Or maybe a > solution for EHCI problem has been explained in the list, but just was > lost in the pile of other messages in linux-omap (it has quite a heavy > traffic). > > It may make sense to look at the 'pm' branch: > http://elinux.org/OMAP_Power_Management > > But this wiki page has comment: > "Enables SmartReflex autocompensation on VDD2 (Note: This feature can only be > tested on a ES3.1 silicon): > # echo 1 > /sys/power/sr_vdd2_autocomp" > > And AFAIK beagleboard revision C has ES3.0 silicon. So no luck here. Or can > something still be done? > > The whole beagleboard EHCI story starts here: > http://groups.google.com/group/beagleboard/browse_thread/thread/5b8385f0bb1f63da/d46625fe49783a8a > -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
