diff options
| author | tkasivajhula <tkasivajhula@nvidia.com> | 2010-06-16 15:23:26 -0700 |
|---|---|---|
| committer | Gary King <gking@nvidia.com> | 2010-06-16 20:21:11 -0700 |
| commit | e47496ef32afa204cdb50b159f816f624554470e (patch) | |
| tree | 21a4260684bf0c8728715a724514c4a299080eab /arch/arm/mach-tegra/platsmp.c | |
| parent | 448326c5f143854eda9401a05006f7c9670a9e63 (diff) | |
[ARM/tegra]: Turn off MMU in LP2tegra-9.12.14
With the MMU on, the instruction prefetcher
can potentially fetch instructions from memory
as the CPU is losing power. This can cause SDRAM to hang.
Change-Id: Iee4a40cc65f25a5969c443710c3a446befd07f41
Reviewed-on: http://git-master/r/2789
Reviewed-by: Trivikram Kasivajhula <tkasivajhula@nvidia.com>
Tested-by: Trivikram Kasivajhula <tkasivajhula@nvidia.com>
Reviewed-by: Gary King <gking@nvidia.com>
Diffstat (limited to 'arch/arm/mach-tegra/platsmp.c')
| -rw-r--r-- | arch/arm/mach-tegra/platsmp.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/arm/mach-tegra/platsmp.c b/arch/arm/mach-tegra/platsmp.c index 3190a7112066..547b2a3bf557 100644 --- a/arch/arm/mach-tegra/platsmp.c +++ b/arch/arm/mach-tegra/platsmp.c @@ -43,6 +43,7 @@ extern void tegra_secondary_startup(void); static DEFINE_SPINLOCK(boot_lock); static void __iomem *scu_base = IO_ADDRESS(TEGRA_ARM_PERIF_BASE); extern void __cortex_a9_restore(void); +extern void __shut_off_mmu(void); #ifdef CONFIG_HOTPLUG_CPU static DEFINE_PER_CPU(struct completion, cpu_killed); @@ -172,6 +173,7 @@ static int create_suspend_pgtable(void) (unsigned long)tegra_context_area, (unsigned long)virt_to_phys(tegra_hotplug_startup), (unsigned long)__cortex_a9_restore, + (unsigned long)virt_to_phys(__shut_off_mmu), }; unsigned long addr_p[] = { PHYS_OFFSET, @@ -179,6 +181,7 @@ static int create_suspend_pgtable(void) (unsigned long)virt_to_phys(tegra_context_area), (unsigned long)virt_to_phys(tegra_hotplug_startup), (unsigned long)virt_to_phys(__cortex_a9_restore), + (unsigned long)virt_to_phys(__shut_off_mmu), }; unsigned int flags = PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_SECT_WBWA | PMD_SECT_S; |