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Commit 7d7d7a41 authored by Florian Fainelli's avatar Florian Fainelli
Browse files

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: default avatarFlorian Fainelli <f.fainelli@gmail.com>
parent e7f0f376

arch/arm/include/asm/vfp.h

+4 −0
Original line number Diff line number Diff line
@@ -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 */

arch/arm/vfp/vfpmodule.c

+13 −0
Original line number Diff line number Diff line
@@ -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)

{