• Dmitry Osipenko's avatar
    ARM: tegra20: Store CPU "resettable" status in IRAM · 4d48edb3
    Dmitry Osipenko authored
    Commit 7232398a ("ARM: tegra: Convert PMC to a driver") changed tegra_resume()
    location storing from late to early and, as a result, broke suspend on Tegra20.
    PMC scratch register 41 is used by tegra LP1 resume code for retrieving stored
    physical memory address of common resume function and in the same time used by
    tegra20_cpu_shutdown() (shared by Tegra20 cpuidle driver and platform SMP code),
    which is storing CPU1 "resettable" status. It implies strict order of scratch
    register usage, otherwise resume function address is lost on Tegra20 after
    disabling non-boot CPU's on suspend. Fix it by storing "resettable" status in
    IRAM instead of PMC scratch register.
    Signed-off-by: default avatarDmitry Osipenko <digetx@gmail.com>
    Fixes: 7232398a (ARM: tegra: Convert PMC to a driver)
    Cc: <stable@vger.kernel.org> # v3.17+
    Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
    4d48edb3
reset-handler.S 6.98 KB