On 12/21/2014 03:52 PM, Dmitry Osipenko wrote:
Commit 7232398abc6a ("ARM: tegra: Convert PMC to a driver") changed tegra_resume()
location storing from late to early and as result broke suspend on tegra20.
PMC scratch register 41 was used by tegra lp1 suspend core code for storing
physical memory address of common resume function and in the same time used by
tegra20 cpuidle driver for storing cpu1 "resettable" status, so it implied
strict order of scratch register use. Fix it by using scratch 40 instead of 41
for tegra_resume() location store.
You likely can't simply change the PMC scratch register usage
arbitrarily; specific registers are designated for specific purposes,
and code outside the Linux kernel (bootloaders, LP0 resume code, secure
monitors, etc.) may depend on those specific values being in those
registers. Without significant research, I'd suggest not changing the
PMC scratch register usage.
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