| Message ID | 1264568422-7809-1-git-send-email-bryan.wu@canonical.com |
|---|---|
| State | Accepted |
| Delegated to: | Andy Whitcroft |
| Headers | show |
Applied to Lucid. -apw
diff --git a/arch/arm/vfp/vfpmodule.c b/arch/arm/vfp/vfpmodule.c index 2d7423a..e0d6b01 100644 --- a/arch/arm/vfp/vfpmodule.c +++ b/arch/arm/vfp/vfpmodule.c @@ -432,6 +432,10 @@ out: #include <linux/smp.h> +#if defined(CONFIG_ARCH_MX51) && defined(CONFIG_NEON) +#include <mach/hardware.h> +#endif + /* * VFP support code initialisation. */ @@ -498,7 +502,8 @@ static int __init vfp_init(void) * load/store instructions, integer and single * precision floating point operations. */ - if ((fmrx(MVFR1) & 0x000fff00) == 0x00011100) + if (((fmrx(MVFR1) & 0x000fff00) == 0x00011100) + && cpu_is_mx51_rev(CHIP_REV_3_0) > 0) elf_hwcap |= HWCAP_NEON; #endif }
BugLink: http://bugs.launchpad.net/bugs/507416 NEON function is broken on old Freescale iMX51 silicons, such as rev1.x and rev2.x. Since more and more iMX51 based products will move to rev3.x or later silicon, we need to enable NEON on these newer silicons and disable NEON on those old ones. This patch will detect the silicon revision dynamically and only export NEON flag to userspace on Freescale iMX51 rev3.x or later silicon. It was tested on Babbage 3.0 board and Babbage 2.x board. Signed-off-by: Bryan Wu <bryan.wu@canonical.com> --- arch/arm/vfp/vfpmodule.c | 7 ++++++- 1 files changed, 6 insertions(+), 1 deletions(-)