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ARM: 8103/1: save/restore Cortex-A9 CP15 registers on suspend/resume

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The CP15 diagnostic register holds ARM errata bits on Cortex-A9, so it
needs to be saved/restored on suspend/resume.  Otherwise, the
effectiveness of errata workaround gets lost together with diagnostic
register bit across suspend/resume cycle.  And the CP15 power control
register of Cortex-A9 shares the same problem.

The patch adds a couple of Cortex-A9 specific suspend/resume functions
to save/restore these two Cortex-A9 CP15 registers across the
suspend/resume cycle.

Signed-off-by: Shawn Guo <shawn.guo@freescale.com>
Acked-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Shawn Guo
2014-07-16 07:40:53 +01:00
committed by Russell King
parent bf67fd3142
commit ddd0c53018
2 changed files with 45 additions and 10 deletions
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18
arch/arm/include/asm/glue-proc.h
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@@ -221,15 +221,6 @@
# endif
#endif
#ifdef CONFIG_CPU_V7
# ifdef CPU_NAME
# undef MULTI_CPU
# define MULTI_CPU
# else
# define CPU_NAME cpu_v7
# endif
#endif
#ifdef CONFIG_CPU_V7M
# ifdef CPU_NAME
# undef MULTI_CPU
@@ -248,6 +239,15 @@
# endif
#endif
#ifdef CONFIG_CPU_V7
/*
* Cortex-A9 needs a different suspend/resume function, so we need
* multiple CPU support for ARMv7 anyway.
*/
# undef MULTI_CPU
# define MULTI_CPU
#endif
#ifndef MULTI_CPU
#define cpu_proc_init __glue(CPU_NAME,_proc_init)
#define cpu_proc_fin __glue(CPU_NAME,_proc_fin)