diff options
| author | Marek Szyprowski <m.szyprowski@samsung.com> | 2019-02-18 09:31:41 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@armlinux.org.uk> | 2019-02-26 12:32:54 +0100 |
| commit | ca70ea43f80c98582f5ffbbd1e6f4da2742da0c4 (patch) | |
| tree | 761a508fd520c37d930a0fce06c319646ab5c255 /arch/arm | |
| parent | ARM: 8840/1: use a raw_spinlock_t in unwind (diff) | |
| download | linux-ca70ea43f80c98582f5ffbbd1e6f4da2742da0c4.tar.xz linux-ca70ea43f80c98582f5ffbbd1e6f4da2742da0c4.zip | |
ARM: 8847/1: pm: fix HYP/SVC mode mismatch when MCPM is used
MCPM does a soft reset of the CPUs and uses common cpu_resume() routine to
perform low-level platform initialization. This results in a try to install
HYP stubs for the second time for each CPU and results in false HYP/SVC
mode mismatch detection. The HYP stubs are already installed at the
beginning of the kernel initialization on the boot CPU (head.S) or in the
secondary_startup() for other CPUs. To fix this issue MCPM code should use
a cpu_resume() routine without HYP stubs installation.
This change fixes HYP/SVC mode mismatch on Samsung Exynos5422-based Odroid
XU3/XU4/HC1 boards.
Fixes: 3721924c8154 ("ARM: 8081/1: MCPM: provide infrastructure to allow for MCPM loopback")
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Nicolas Pitre <nico@linaro.org>
Tested-by: Anand Moon <linux.amoon@gmail.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/common/mcpm_entry.c | 2 | ||||
| -rw-r--r-- | arch/arm/include/asm/suspend.h | 1 | ||||
| -rw-r--r-- | arch/arm/kernel/sleep.S | 12 |
3 files changed, 14 insertions, 1 deletions
diff --git a/arch/arm/common/mcpm_entry.c b/arch/arm/common/mcpm_entry.c index ad574d20415c..1b1b82b37ce0 100644 --- a/arch/arm/common/mcpm_entry.c +++ b/arch/arm/common/mcpm_entry.c @@ -381,7 +381,7 @@ static int __init nocache_trampoline(unsigned long _arg) unsigned int cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1); phys_reset_t phys_reset; - mcpm_set_entry_vector(cpu, cluster, cpu_resume); + mcpm_set_entry_vector(cpu, cluster, cpu_resume_no_hyp); setup_mm_for_reboot(); __mcpm_cpu_going_down(cpu, cluster); diff --git a/arch/arm/include/asm/suspend.h b/arch/arm/include/asm/suspend.h index 452bbdcbcc83..506314265c6f 100644 --- a/arch/arm/include/asm/suspend.h +++ b/arch/arm/include/asm/suspend.h @@ -10,6 +10,7 @@ struct sleep_save_sp { }; extern void cpu_resume(void); +extern void cpu_resume_no_hyp(void); extern void cpu_resume_arm(void); extern int cpu_suspend(unsigned long, int (*)(unsigned long)); diff --git a/arch/arm/kernel/sleep.S b/arch/arm/kernel/sleep.S index a8257fc9cf2a..5dc8b80bb693 100644 --- a/arch/arm/kernel/sleep.S +++ b/arch/arm/kernel/sleep.S @@ -120,6 +120,14 @@ ENDPROC(cpu_resume_after_mmu) .text .align +#ifdef CONFIG_MCPM + .arm +THUMB( .thumb ) +ENTRY(cpu_resume_no_hyp) +ARM_BE8(setend be) @ ensure we are in BE mode + b no_hyp +#endif + #ifdef CONFIG_MMU .arm ENTRY(cpu_resume_arm) @@ -135,6 +143,7 @@ ARM_BE8(setend be) @ ensure we are in BE mode bl __hyp_stub_install_secondary #endif safe_svcmode_maskall r1 +no_hyp: mov r1, #0 ALT_SMP(mrc p15, 0, r0, c0, c0, 5) ALT_UP_B(1f) @@ -164,6 +173,9 @@ ENDPROC(cpu_resume) #ifdef CONFIG_MMU ENDPROC(cpu_resume_arm) #endif +#ifdef CONFIG_MCPM +ENDPROC(cpu_resume_no_hyp) +#endif .align 2 _sleep_save_sp: |