Abhilash Kesavan <a.kesavan@xxxxxxxxxxx> writes: > Turning off a cluster when all 4 cores of the cluster are powered off > saves power significantly. Powering off the A15 L2 alone gives around > 100mW in savings. Add support for powering off the A15/A7 clusters on > exynos5420/5800. > > The patch enables specific register bits which ensure that: > - cluster L2 will be turned on before the first man is powered up. > - last man will be turned off before the cluster L2 is turned off. > - core is powered down before powering it up. > > Remove the exynos_cluster_power_control function completely as we can > rely on the above mentioned bits rather than polling the cluster power > status register. > > Signed-off-by: Abhilash Kesavan <a.kesavan@xxxxxxxxxxx> > Acked-by: Nicolas Pitre <nico@xxxxxxxxxx> > --- > Change in v2: > Added a macro for the COMMON_OPTION register and used it in the MCPM > back-end. > > The patch is based on Linux-next 20140619. It has been tested on an > exynos5420-based chromebook using the "/dev/bL_switcher" interface as > well as the script provided by Nicolas Pitre and Dave Martin [1]. > > Patch depends on: > [v2] ARM: EXYNOS: mcpm: Don't rely on firmware's secondary_cpu_start > > [1] http://www.spinics.net/lists/linux-samsung-soc/msg31257.html Tested on exynos5800/Chromebook2 along with the dependency patch and using the script from Dave and Nico. Tested-by: Kevin Hilman <khilman@xxxxxxxxxx> Kevin -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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