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| author | Amit Kucheria <amit.kucheria@verdurent.com> | 2010-09-01 22:49:13 +0300 |
|---|---|---|
| committer | Nicolas Pitre <nicolas.pitre@linaro.org> | 2010-10-01 22:26:38 -0400 |
| commit | 33d7c5c1c808ea47d85630ac2dd98490d7df0ff4 (patch) | |
| tree | a2f309098df9e509963e18f6aca9692251fb141b | |
| parent | c62d0f2ac18d38265ccf0e821e6afee60a0c89b5 (diff) | |
| download | kernel_samsung_smdk4412-33d7c5c1c808ea47d85630ac2dd98490d7df0ff4.zip kernel_samsung_smdk4412-33d7c5c1c808ea47d85630ac2dd98490d7df0ff4.tar.gz kernel_samsung_smdk4412-33d7c5c1c808ea47d85630ac2dd98490d7df0ff4.tar.bz2 | |
ARM: mxc: turn off HWCAP_NEON for older versions of imx51 silicon
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>
| -rw-r--r-- | 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..eaacb6e 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 && (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) { unsigned int reg; |