Messages in this thread | | | Date | Mon, 19 Jan 2015 18:14:30 +0300 | From | Dmitry Osipenko <> | Subject | Re: [PATCH] ARM: tegra20: Store CPU "resettable" status in IRAM |
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19.01.2015 17:12, Thierry Reding пишет: > On Thu, Jan 15, 2015 at 01:58:57PM +0300, Dmitry Osipenko wrote: >> Commit 7232398abc6a ("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: Dmitry Osipenko <digetx@gmail.com> >> Fixes: 7232398abc6a (ARM: tegra: Convert PMC to a driver) >> Cc: <stable@vger.kernel.org> # v3.17+ >> --- >> arch/arm/mach-tegra/cpuidle-tegra20.c | 5 ++--- >> arch/arm/mach-tegra/reset-handler.S | 10 +++++++--- >> arch/arm/mach-tegra/reset.h | 4 ++++ >> arch/arm/mach-tegra/sleep-tegra20.S | 37 ++++++++++++++++++++--------------- >> arch/arm/mach-tegra/sleep.h | 4 ++++ >> 5 files changed, 38 insertions(+), 22 deletions(-) > > I'm leaning towards applying this. Stephen, Alex, Peter: any objections? > > Thierry > Btw, I'm preparing cleanup for cpuidle and hotplug code. So this asm "ugliness" should go away.
-- Dmitry
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