diff options
| author | Jason Liu <r64343@freescale.com> | 2012-02-16 15:45:36 +0800 |
|---|---|---|
| committer | Jason Liu <r64343@freescale.com> | 2012-02-16 18:49:53 +0800 |
| commit | 41dcb354129b74a9ad6ab1ba5b46900f9cc71687 (patch) | |
| tree | c92bea759ab9e1222ebf6d44ae67c56428f7d14c | |
| parent | 2a60b1d6c1212dd7673755c6c8a8c346b0f99944 (diff) | |
ENGR00174652 i.mx6: explicitly set the LPM mode to run mode during early bootup
the reset value of LPM[1:0] in CCM_CLPCR register is b'01, which means
system will enter into wait mode on next assertion of dsm_request signal.
In order to avoid the system unexpectly enter the wait mode during bootup
we need set the LPM mode to run mode explicity during early boot up phase,
Anytime, we want system to enter the wait mode, the sw procedure is:
mxc_cpu_lp_set(LP_MODE) -> set CCM_CLPCR register -> system enter wait mode
This patch also fix linux kernel reboot stress test on i.mx6dl, without this
patch linux kernel reboot test will fail random with error like this:
[ 12.091220] Bad mode in interrupt handler detected
[ 12.096056] Bad mode in interrupt handler detected
[ 12.100851] Internal error: Oops - bad mode: 0 [#1] PREEMPT SMP
Signed-off-by: Jason Liu <r64343@freescale.com>
| -rw-r--r-- | arch/arm/mach-mx6/mm.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm/mach-mx6/mm.c b/arch/arm/mach-mx6/mm.c index e4daaf1fb415..6e80f0aa11a3 100644 --- a/arch/arm/mach-mx6/mm.c +++ b/arch/arm/mach-mx6/mm.c @@ -81,6 +81,7 @@ void __init mx6_map_io(void) mxc_iomux_v3_init(IO_ADDRESS(MX6Q_IOMUXC_BASE_ADDR)); mxc_arch_reset_init(IO_ADDRESS(MX6Q_WDOG1_BASE_ADDR)); mx6_set_cpu_type(); + mxc_cpu_lp_set(WAIT_CLOCKED); } #ifdef CONFIG_CACHE_L2X0 int mxc_init_l2x0(void) |