Nicolas, On Mon, Jun 23, 2014 at 9:11 PM, Nicolas Pitre <nicolas.pitre@xxxxxxxxxx> wrote: > The kernel already has the responsibility to handle resources such as the > CCI when hotplugging CPUs, during the booting of secondary CPUs, and when > resuming from suspend/idle. It would be more coherent and less confusing > if the CCI for the boot CPU (or cluster) was also initialized by the kernel rather than expecting the nit: wrap long line? > firmware/bootloader to do it and only in that case. After all, the kernel > has all the necessary code already and the bootloader shouldn't have to > care at all. > > The CCI may be turned on only when the cache is off. Leveraging the CPU > suspend code to loop back through the low-level MCPM entry point is all > that is needed to properly turn on the CCI from the kernel by using the > same code as for secondary boot. > > Let's provide a generic MCPM loopback function that can be invoked by > backend initialization code to set things (CCI or similar) on the boot > CPU just as it is done for the other CPUs. > > Signed-off-by: Nicolas Pitre <nico@xxxxxxxxxx> > --- > arch/arm/common/mcpm_entry.c | 52 ++++++++++++++++++++++++++++++++++++++++++++ > arch/arm/include/asm/mcpm.h | 16 ++++++++++++++ > 2 files changed, 68 insertions(+) Thank you very much for posting! With your series I'm able to boot all 8 cores on exynos5420-peach-pit and exynos5800-peach-pi sitting on my desk. Tested-by: Doug Anderson <dianders@xxxxxxxxxxxx> I will note that git yelled about whitespace damage on theis patch: # pwclient git-am 4406301 Applying patch #4406301 using 'git am' Description: [1/3] ARM: MCPM: provide infrastructure to allow for MCPM loopback Applying: ARM: MCPM: provide infrastructure to allow for MCPM loopback /b/tip/src/third_party/kernel/3.8/.git/rebase-apply/patch:51: trailing whitespace. /b/tip/src/third_party/kernel/3.8/.git/rebase-apply/patch:95: trailing whitespace. * to the MCPM low-level entry code before returning to the caller. warning: 2 lines add whitespace errors. -- 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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