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| author | Joseph Lo <josephl@nvidia.com> | 2013-07-03 17:50:39 +0800 |
|---|---|---|
| committer | Stephen Warren <swarren@nvidia.com> | 2013-07-19 10:08:05 -0600 |
| commit | 2f5aaa3d2703256d37ae75818c495783d4ad0543 (patch) | |
| tree | 8a2a04aae10c5fc208e430e7fa4a457190fcfc03 /arch/arm/mach-tegra | |
| parent | ac2527bfc21739b77d687df1bfc4e973103fef7b (diff) | |
| download | blackbird-op-linux-2f5aaa3d2703256d37ae75818c495783d4ad0543.tar.gz blackbird-op-linux-2f5aaa3d2703256d37ae75818c495783d4ad0543.zip | |
ARM: tegra: set up the correct L2 data RAM latency for Cortex-A15
When there is a cluster power down cycle in suspend, we need to set up
the correct L2 RAM data RAM latency to make L2 cache work correctly. This
is only needed for cluster 0 and needs to be done in tegra_resume before
the cache is enabled.
Signed-off-by: Joseph Lo <josephl@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Diffstat (limited to 'arch/arm/mach-tegra')
| -rw-r--r-- | arch/arm/mach-tegra/reset-handler.S | 1 | ||||
| -rw-r--r-- | arch/arm/mach-tegra/sleep.S | 22 |
2 files changed, 23 insertions, 0 deletions
diff --git a/arch/arm/mach-tegra/reset-handler.S b/arch/arm/mach-tegra/reset-handler.S index 75285a3b816e..34614bdf3f5b 100644 --- a/arch/arm/mach-tegra/reset-handler.S +++ b/arch/arm/mach-tegra/reset-handler.S @@ -45,6 +45,7 @@ ENTRY(tegra_resume) check_cpu_part_num 0xc09, r8, r9 bleq v7_invalidate_l1 + blne tegra_init_l2_for_a15 cpu_id r0 tegra_get_soc_id TEGRA_APB_MISC_BASE, r6 diff --git a/arch/arm/mach-tegra/sleep.S b/arch/arm/mach-tegra/sleep.S index 6d6600dcbfe2..8388113419fd 100644 --- a/arch/arm/mach-tegra/sleep.S +++ b/arch/arm/mach-tegra/sleep.S @@ -69,6 +69,28 @@ ENDPROC(tegra_disable_clean_inv_dcache) #ifdef CONFIG_PM_SLEEP /* + * tegra_init_l2_for_a15 + * + * set up the correct L2 cache data RAM latency + */ +ENTRY(tegra_init_l2_for_a15) + mrc p15, 0, r0, c0, c0, 5 + ubfx r0, r0, #8, #4 + tst r0, #1 @ only need for cluster 0 + bne _exit_init_l2_a15 + + mrc p15, 0x1, r0, c9, c0, 2 + and r0, r0, #7 + cmp r0, #2 + bicne r0, r0, #7 + orrne r0, r0, #2 + mcrne p15, 0x1, r0, c9, c0, 2 +_exit_init_l2_a15: + + mov pc, lr +ENDPROC(tegra_init_l2_for_a15) + +/* * tegra_sleep_cpu_finish(unsigned long v2p) * * enters suspend in LP2 by turning off the mmu and jumping to |
