Hi Viresh,
On Thursday 29 of August 2013 13:45:56 Viresh Kumar wrote:
> On Tue, Jun 18, 2013 at 11:59 AM, Chander Kashyap
>
> <chander.kashyap@xxxxxxxxxx> wrote:
> > Instead of having to specify the number for CPUs in Exynos5250 in
> > platsmp.c file, let the number of CPUs be determined by having this
> > information listed in Exynos5250 device tree file.
> >
> > Signed-off-by: Chander Kashyap <chander.kashyap@xxxxxxxxxx>
> > Reviewed-by: Tomasz Figa <t.figa@xxxxxxxxxxx>
> > ---
> >
> > arch/arm/boot/dts/exynos5250.dtsi | 16 ++++++++++++++++
> > arch/arm/mach-exynos/platsmp.c | 10 +++++++---
> > 2 files changed, 23 insertions(+), 3 deletions(-)
> >
> > diff --git a/arch/arm/boot/dts/exynos5250.dtsi
> > b/arch/arm/boot/dts/exynos5250.dtsi index 63ca03d..1aeef98 100644
> > --- a/arch/arm/boot/dts/exynos5250.dtsi
> > +++ b/arch/arm/boot/dts/exynos5250.dtsi
> > @@ -50,6 +50,22 @@
> >
> > pinctrl3 = &pinctrl_3;
> >
> > };
> >
> > + cpus {
> > + #address-cells = <1>;
> > + #size-cells = <0>;
> > +
> > + cpu@0 {
> > + device_type = "cpu";
> > + compatible = "arm,cortex-a15";
> > + reg = <0>;
> > + };
> > + cpu@1 {
> > + device_type = "cpu";
> > + compatible = "arm,cortex-a15";
> > + reg = <1>;
> > + };
> > + };
> > +
> >
> > pd_gsc: gsc-power-domain@0x10044000 {
> >
> > compatible = "samsung,exynos4210-pd";
> > reg = <0x10044000 0x20>;
> >
> > diff --git a/arch/arm/mach-exynos/platsmp.c
> > b/arch/arm/mach-exynos/platsmp.c index 1a4e4e5..85ea4ca 100644
> > --- a/arch/arm/mach-exynos/platsmp.c
> > +++ b/arch/arm/mach-exynos/platsmp.c
> > @@ -180,10 +180,14 @@ static void __init exynos_smp_init_cpus(void)
> >
> > void __iomem *scu_base = scu_base_addr();
> > unsigned int i, ncores;
> >
> > - if (soc_is_exynos5250())
> > - ncores = 2;
> > - else
> > + if (read_cpuid_part_number() == ARM_CPU_PART_CORTEX_A9)
> >
> > ncores = scu_base ? scu_get_core_count(scu_base) : 1;
> >
> > + else
> > + /*
> > + * CPU Nodes are passed thru DT and set_cpu_possible
> > + * is set by "arm_dt_init_cpu_maps".
> > + */
> > + return;
> >
> > /* sanity check */
> > if (ncores > nr_cpu_ids) {
>
> After this patch only one cpu is coming up for me on my Arndale board..
> Revert of this one fixes the issue though (Tested over v3.11-rc7)
It is quite likely that 0 and 1 are not real MPIDR values for CPU cores on
Exynos5250, because cluster ID might not be 0, as one could expect.
This is what I found out on Exynos4210 and 4x12, when trying to add CPU
nodes in DT for them, leading in turn to a series of regressions, for which
it was to late to do all the necessary code rework to fix them for 3.12, so
I had to defer this work for next release.
Best regards,
Tomasz
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