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ARM: mxc: turn off HWCAP_NEON for older versions of imx51 silicon

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Versions of silicon older than TO3 have broken NEON implementation. Turn off
NEON in such cases.

Signed-off-by: Amit Kucheria <amit.kucheria@linaro.org>
Tested-by: Dave Martin <dave.martin@linaro.org>
Tested-by: Jason Hui <jason.hui@linaro.org>
Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
This commit is contained in:
Amit Kucheria
2010-09-01 22:49:13 +03:00
committed by Nicolas Pitre
parent c62d0f2ac1
commit 33d7c5c1c8
1 changed files with 19 additions and 0 deletions
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19
arch/arm/mach-mx5/cpu.c
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@@ -70,6 +70,25 @@ int mx51_revision(void)
} }
EXPORT_SYMBOL(mx51_revision); EXPORT_SYMBOL(mx51_revision);
#ifdef CONFIG_NEON
/*
* All versions of the silicon before Rev. 3 have broken NEON implementations.
* Dependent on link order - so the assumption is that vfp_init is called
* before us.
*/
static int __init mx51_neon_fixup(void)
{
if (mx51_revision() < MX51_CHIP_REV_3_0 && (elf_hwcap & HWCAP_NEON)) {
elf_hwcap &= ~HWCAP_NEON;
pr_info("Turning off NEON support, detected broken NEON implementation\n");
}
return 0;
}
late_initcall(mx51_neon_fixup);
#endif
static int __init post_cpu_init(void) static int __init post_cpu_init(void)
{ {
unsigned int reg; unsigned int reg;