Messages in this thread | | | Date | Tue, 6 Mar 2012 20:09:12 +0100 | From | Thierry Reding <> | Subject | Re: [PATCH/RFC 2/2] arm/tegra: add timeout to PCIe PLL lock detection loop |
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* Stephen Warren wrote: > On 03/06/2012 01:45 AM, Dmitry Artamonow wrote: > > Tegra PCIe driver waits for PLL to lock using busy loop. > > If PLL fails to lock for some reason, this leads to silent lockup > > while booting (as PCIe code is not modular). > > > > Fix by adding timeout, so if PLL doesn't lock in a couple > > of seconds, just PCIe driver fails and machine continues to boot. > > > > Signed-off-by: Dmitry Artamonow <mad_soft@inbox.ru> > > That seems reasonable. So once the mdelay discussion is resolved, > > Acked-by: Stephen Warren <swarren@wwwdotorg.org> > > Any idea why the PLL doesn't lock sometimes?
I've seen this happen when the 1.05V regulator (GPIO#2 of the PMU on Harmony) isn't enabled.
Thierry [unhandled content-type:application/pgp-signature] | |