Re: exynos5422-odroid-xu3: MCPM: only 6 of 8 CPUs coming online

[Abhilash Kesavan <a.kesavan@samsung.com>]

Hi Kevin,

I had noticed a similar issue where only 6 cores would come up during development on 5420. This was because there was a check in our u-boot secondary boot-up path which would put a core into WFI if a flag was not present and hence fail to boot. I wonder if it is the same situation in your case too.
Is the u-boot for odroid-xu3 publically available or can you check if there is any such code present in your secondary bring-up path.

Regards,
Abhilash
------- Original Message -------
Sender : Kevin Hilman<khilman@linaro.org>
Date : Oct 09, 2014 00:28 (GMT+05:30)
Title : exynos5422-odroid-xu3: MCPM: only 6 of 8 CPUs coming online

Hi Chander, Abhilash,

I'm using the exynos5422 odroid-xu3 and only 6 of 8 cores are coming
online when using MCPM[1].  All the A15s are booting but only 2 of the
A7s, one of which is the primary CPU.

After booting, if I try to manually bring one of the CPUs online via
/sys/devices/.../cpuX/online, I hit the BUG() in
mcpm-exynos.c:exynos_power_up().

Any ideas why 2 of the A7s aren't booting up?

Kevin

[1]
[    0.001719] CPU: Testing write buffer coherency: ok
[    0.002171] CPU0: update cpu_capacity 448
[    0.002187] CPU0: thread -1, cpu 0, socket 1, mpidr 80000100
[    0.002429] Setting up static identity map for 0x4046df70 - 0x4046dfc8
[    0.002732] ARM CCI driver probed
[    0.002815] exynos_mcpm_usage_count_init: cpu 0 cluster 1
[    0.003010] Exynos MCPM support installed
[    0.030310] mcpm_boot_secondary: logical CPU 1 is physical CPU 0 cluster 0
[    0.030326] exynos_power_up: cpu 0 cluster 0
[    0.030626] CPU1: Booted secondary processor
[    0.030686] CPU1: update cpu_capacity 1535
[    0.030693] CPU1: thread -1, cpu 0, socket 0, mpidr 80000000
[    0.040314] mcpm_boot_secondary: logical CPU 2 is physical CPU 1 cluster 0
[    0.040340] exynos_power_up: cpu 1 cluster 0
[    0.040629] CPU2: Booted secondary processor
[    0.040672] CPU2: update cpu_capacity 1535
[    0.040679] CPU2: thread -1, cpu 1, socket 0, mpidr 80000001
[    0.050321] mcpm_boot_secondary: logical CPU 3 is physical CPU 2 cluster 0
[    0.050347] exynos_power_up: cpu 2 cluster 0
[    0.050659] CPU3: Booted secondary processor
[    0.050703] CPU3: update cpu_capacity 1535
[    0.050710] CPU3: thread -1, cpu 2, socket 0, mpidr 80000002
[    0.060316] mcpm_boot_secondary: logical CPU 4 is physical CPU 3 cluster 0
[    0.060343] exynos_power_up: cpu 3 cluster 0
[    0.060631] CPU4: Booted secondary processor
[    0.060675] CPU4: update cpu_capacity 1535
[    0.060682] CPU4: thread -1, cpu 3, socket 0, mpidr 80000003
[    0.070316] mcpm_boot_secondary: logical CPU 5 is physical CPU 1 cluster 1
[    0.070343] exynos_power_up: cpu 1 cluster 1
[    1.070007] CPU5: failed to come online
[    1.080322] mcpm_boot_secondary: logical CPU 6 is physical CPU 2 cluster 1
[    1.080337] exynos_power_up: cpu 2 cluster 1
[    1.080625] CPU6: Booted secondary processor
[    1.080691] CPU6: update cpu_capacity 448
[    1.080699] CPU6: thread -1, cpu 2, socket 1, mpidr 80000102
[    1.090331] mcpm_boot_secondary: logical CPU 7 is physical CPU 3 cluster 1
[    1.090356] exynos_power_up: cpu 3 cluster 1
[    2.090023] CPU7: failed to come online
[    2.090055] Brought up 6 CPUs
[    2.090067] SMP: Total of 6 processors activated.
[    2.090079] CPU: WARNING: CPU(s) started in wrong/inconsistent
modes (primary CPU mode 0x13)
[    2.090089] CPU: This may indicate a broken bootloader or firmware.