[PATCH v9] ARM: EXYNOS: Use MCPM call-backs to support S2R on Exynos5420

[kgene@kernel.org (Kukjin Kim)]

Javier Martinez Canillas wrote:
> 
> Hello Abhilash,
> 
> On Wed, Oct 8, 2014 at 7:41 AM, Abhilash Kesavan <a.kesavan@samsung.com> wrote:
> > Use the MCPM layer to handle core suspend/resume on Exynos5420.
> > Also, restore the entry address setup code post-resume.
> >
> > Signed-off-by: Abhilash Kesavan <a.kesavan@samsung.com>
> > Acked-by: Nicolas Pitre <nico@linaro.org>
> > ---
> > Changes in v2:
> >         - Made use of the MCPM suspend/powered_up call-backs
> > Changes in v3:
> >         - Used the residency value to indicate the entered state
> > Changes in v4:
> >         - Checked if MCPM has been enabled to prevent build error
> > Changes in v5:
> >         - Removed the MCPM flags and just used a local flag to
> >         indicate that we are suspending.
> > Changes in v6:
> >         - Read the SYS_PWR_REG value to decide if we are suspending
> >         the system.
> >         - Restore the SYS_PWR_REG value post-resume.
> >         - Modified the comments to reflect the first change.
> > Changes in v7:
> >         - Add the suspend check in exynos_cpu_power_down() rather
> >         than the MCPM back-end.
> >         - Clean-up unnecessary changes related to earlier versions.
> > Changes in v8:
> >         - Rebased on the latest exynos PMU/PM support patches.
> > Changes in v9:
> >         - Fixed rebasing issues in v8
> >         - Used pmu_raw_readl instead of __raw_readl
> >
> > This patch is based on kgene's for-next branch.
> > http://git.kernel.org/cgit/linux/kernel/git/kgene/linux-samsung.git/log/?h=for-next
> >
> > Here are the dependencies:
> > 1) Decouple syscon interface from platform devices - v7
> > http://lkml.org/lkml/2014/9/30/156
> >
> > 2) ARM: Exynos: Convert PMU implementation into a platform driver - v9
> > https://lkml.org/lkml/2014/10/6/89
> >
> > 3) Exynos5420 PMU/S2R Series - v9
> > http://www.spinics.net/lists/arm-kernel/msg368207.html
> >
> >  arch/arm/mach-exynos/mcpm-exynos.c |   32 +++++++++++++++--------
> >  arch/arm/mach-exynos/platsmp.c     |   12 +++++++++
> >  arch/arm/mach-exynos/suspend.c     |   49 ++++++++++++++++++++++++++++++++----
> >  3 files changed, 78 insertions(+), 15 deletions(-)

[...]

> > --
> 
> Patch looks good to me and also I tested on my Exynos5420 Peach Pit
> and Suspend-to-Ram and resume is working correctly, so:
> 
> Reviewed-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
> Tested-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
> 
Thanks for your review and test.

- Kukjin