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| author | Stephen Boyd <sboyd@codeaurora.org> | 2015-06-09 19:24:23 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2015-06-12 21:17:17 +0100 |
| commit | 32e55a777f839316ffcabd0c1a5192e5ffca55e7 (patch) | |
| tree | 6912bc1737fd9f374914bb7244b5b95751086cf1 | |
| parent | 02b4e2756e01c623cc4dbceae4b07be75252db5b (diff) | |
| download | lwn-32e55a777f839316ffcabd0c1a5192e5ffca55e7.tar.gz lwn-32e55a777f839316ffcabd0c1a5192e5ffca55e7.zip | |
ARM: 8389/1: Add cpu_resume_arm() for firmwares that resume in ARM state
Some platforms always enter the kernel in the ARM state even if
the kernel is compiled for THUMB2. Add a small wrapper on top of
cpu_resume() that switches into THUMB2 state.
This provides the functionality to fix a problem reported by Kevin
Hilman on next-20150601 where the ifc6410 fails to boot a THUMB2
kernel because the platform's firmware always enters the kernel in
ARM mode from deep idle states.
(rmk: tweaked to work without BSYM->badr changes.)
Reported-by: Kevin Hilman <khilman@linaro.org>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Lina Iyer <lina.iyer@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| -rw-r--r-- | arch/arm/include/asm/suspend.h | 1 | ||||
| -rw-r--r-- | arch/arm/kernel/sleep.S | 7 |
2 files changed, 8 insertions, 0 deletions
diff --git a/arch/arm/include/asm/suspend.h b/arch/arm/include/asm/suspend.h index cd20029bcd94..6c7182f32cef 100644 --- a/arch/arm/include/asm/suspend.h +++ b/arch/arm/include/asm/suspend.h @@ -7,6 +7,7 @@ struct sleep_save_sp { }; extern void cpu_resume(void); +extern void cpu_resume_arm(void); extern int cpu_suspend(unsigned long, int (*)(unsigned long)); #endif diff --git a/arch/arm/kernel/sleep.S b/arch/arm/kernel/sleep.S index 7d37bfc50830..761c5debfab0 100644 --- a/arch/arm/kernel/sleep.S +++ b/arch/arm/kernel/sleep.S @@ -118,6 +118,12 @@ ENDPROC(cpu_resume_after_mmu) .text .align + .arm +ENTRY(cpu_resume_arm) + THUMB( adr r9, BSYM(1f) ) @ Kernel is entered in ARM. + THUMB( bx r9 ) @ If this is a Thumb-2 kernel, + THUMB( .thumb ) @ switch to Thumb now. + THUMB(1: ) ENTRY(cpu_resume) ARM_BE8(setend be) @ ensure we are in BE mode #ifdef CONFIG_ARM_VIRT_EXT @@ -149,6 +155,7 @@ THUMB( ldmia r0!, {r1, r2, r3} ) THUMB( mov sp, r2 ) THUMB( bx r3 ) ENDPROC(cpu_resume) +ENDPROC(cpu_resume_arm) .align 2 _sleep_save_sp: |