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)
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