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| author | Florian Fainelli <f.fainelli@gmail.com> | 2015-04-17 16:53:58 -0700 |
|---|---|---|
| committer | Florian Fainelli <f.fainelli@gmail.com> | 2015-05-20 15:07:00 -0700 |
| commit | 7d7d7a413c5b8dddfde56dce1dd42e2199033c6c (patch) | |
| tree | d0cec5573426b6bdde46df0eb850a8e487e09096 /arch | |
| parent | e7f0f376490f754baf49976002b32c4daaaf323a (diff) | |
| download | blackbird-op-linux-7d7d7a413c5b8dddfde56dce1dd42e2199033c6c.tar.gz blackbird-op-linux-7d7d7a413c5b8dddfde56dce1dd42e2199033c6c.zip | |
ARM: vfp: Add vfp_disable for problematic platforms
Some platforms might not be able to fully utilize VFP when e.g: one CPU
out of two in a SMP complex lacks a VFP unit. Adding code to migrate
task to the CPU which has a VFP unit would be cumbersome and not
performant, instead, just add the ability to disable VFP.
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/include/asm/vfp.h | 4 | ||||
| -rw-r--r-- | arch/arm/vfp/vfpmodule.c | 13 |
2 files changed, 17 insertions, 0 deletions
diff --git a/arch/arm/include/asm/vfp.h b/arch/arm/include/asm/vfp.h index 03f9ca3cdfa4..22e414056a8c 100644 --- a/arch/arm/include/asm/vfp.h +++ b/arch/arm/include/asm/vfp.h @@ -91,4 +91,8 @@ #define VFPOPDESC_UNUSED_MASK (0xFF << VFPOPDESC_UNUSED_BIT) #define VFPOPDESC_OPDESC_MASK (~(VFPOPDESC_LENGTH_MASK | VFPOPDESC_UNUSED_MASK)) +#ifndef __ASSEMBLY__ +void vfp_disable(void); +#endif + #endif /* __ASM_VFP_H */ diff --git a/arch/arm/vfp/vfpmodule.c b/arch/arm/vfp/vfpmodule.c index f6e4d56eda00..2a61e4b04600 100644 --- a/arch/arm/vfp/vfpmodule.c +++ b/arch/arm/vfp/vfpmodule.c @@ -445,6 +445,19 @@ static void vfp_enable(void *unused) set_copro_access(access | CPACC_FULL(10) | CPACC_FULL(11)); } +/* Called by platforms on which we want to disable VFP because it may not be + * present on all CPUs within a SMP complex. Needs to be called prior to + * vfp_init(). + */ +void vfp_disable(void) +{ + if (VFP_arch) { + pr_debug("%s: should be called prior to vfp_init\n", __func__); + return; + } + VFP_arch = 1; +} + #ifdef CONFIG_CPU_PM static int vfp_pm_suspend(void) { |
