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    SubjectRe: [PATCH/RFC 2/2] arm/tegra: add timeout to PCIe PLL lock detection loop
    * 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
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