diff options
| author | eric miao <eric.miao@marvell.com> | 2008-01-28 23:00:02 +0000 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2008-02-04 13:17:33 +0000 |
| commit | c4d1fb627ff307256d792280efcb09e1235affea (patch) | |
| tree | 260ed71dd94883353de1e9256d3d7337d0a7b81a /arch/arm/mach-pxa/mfp.c | |
| parent | 16dfdbf038706c12c56f327d14c6b901edc376a3 (diff) | |
[ARM] pxa: add preliminary suspend/resume code for pxa3xx
1. clear RDH bit after resuming back from D3, otherwise, the multi function
pins will retain the low power state
2. save/restore essential system registers
Signed-off-by: eric miao <eric.miao@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mach-pxa/mfp.c')
| -rw-r--r-- | arch/arm/mach-pxa/mfp.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/arm/mach-pxa/mfp.c b/arch/arm/mach-pxa/mfp.c index 6ce35041c7ed..f5809adce298 100644 --- a/arch/arm/mach-pxa/mfp.c +++ b/arch/arm/mach-pxa/mfp.c @@ -22,6 +22,7 @@ #include <asm/hardware.h> #include <asm/arch/mfp.h> #include <asm/arch/mfp-pxa3xx.h> +#include <asm/arch/pxa3xx-regs.h> /* mfp_spin_lock is used to ensure that MFP register configuration * (most likely a read-modify-write operation) is atomic, and that @@ -223,6 +224,14 @@ static int pxa3xx_mfp_resume(struct sys_device *d) struct pxa3xx_mfp_pin *p = &mfp_table[pin]; __mfp_config_run(p); } + + /* clear RDH bit when MFP settings are restored + * + * NOTE: the last 3 bits DxS are write-1-to-clear so carefully + * preserve them here in case they will be referenced later + */ + ASCR &= ~(ASCR_RDH | ASCR_D1S | ASCR_D2S | ASCR_D3S); + return 0; } |