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| author | Florian Fainelli <f.fainelli@gmail.com> | 2015-04-18 01:53:58 +0200 |
|---|---|---|
| committer | Florian Fainelli <f.fainelli@gmail.com> | 2015-05-21 00:07:00 +0200 |
| commit | 7d7d7a413c5b8dddfde56dce1dd42e2199033c6c (patch) | |
| tree | d0cec5573426b6bdde46df0eb850a8e487e09096 /arch/arm/vfp/vfpmodule.c | |
| parent | ARM: vfp: Add include guards (diff) | |
| download | linux-7d7d7a413c5b8dddfde56dce1dd42e2199033c6c.tar.xz 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/arm/vfp/vfpmodule.c')
| -rw-r--r-- | arch/arm/vfp/vfpmodule.c | 13 |
1 files changed, 13 insertions, 0 deletions
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) { |