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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>
hifive-unleashed-5.1
Florian Fainelli 2015-04-17 16:53:58 -07:00
parent e7f0f37649
commit 7d7d7a413c
2 changed files with 17 additions and 0 deletions
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4
arch/arm/include/asm/vfp.h
View File

@ -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 */

13
arch/arm/vfp/vfpmodule.c
View File

@ -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)
{