From 7d7d7a413c5b8dddfde56dce1dd42e2199033c6c Mon Sep 17 00:00:00 2001 From: Florian Fainelli Date: Fri, 17 Apr 2015 16:53:58 -0700 Subject: 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 --- arch/arm/vfp/vfpmodule.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'arch/arm/vfp') 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) { -- cgit v1.2.3