[PATCH 2/2] ARM: mxc: turn off HWCAP_NEON for older versions of imx51 silicon

[Sergei Shtylyov]

Hello.

Nicolas Pitre wrote:

> From: Amit Kucheria <amit.kucheria at verdurent.com>

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

> Signed-off-by: Amit Kucheria <amit.kucheria at linaro.org>
> Tested-by: Dave Martin <dave.martin at linaro.org>
> Tested-by: Jason Hui <jason.hui at linaro.org>
> Signed-off-by: Nicolas Pitre <nicolas.pitre at linaro.org>
> ---
>  arch/arm/mach-mx5/cpu.c |   19 +++++++++++++++++++
>  1 files changed, 19 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/arm/mach-mx5/cpu.c b/arch/arm/mach-mx5/cpu.c
> index 2d37785..548c55b 100644
> --- a/arch/arm/mach-mx5/cpu.c
> +++ b/arch/arm/mach-mx5/cpu.c
> @@ -70,6 +70,25 @@ int mx51_revision(void)
>  }
>  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) {

   Too many spaces after '<'?

> +		if (elf_hwcap & HWCAP_NEON) {

    Could be collapsed into the preceding *if*, and so indentation level made 
one less...

> +			elf_hwcap &= ~HWCAP_NEON;
> +			pr_info("Turning off NEON support, detected broken NEON implementation\n");
> +		}
> +	}
> +	return 0;
> +}
> +
> +late_initcall(mx51_neon_fixup);
> +#endif
> +

WBR, Sergei