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ARM: 8196/1: vfp: Workaround bad MVFR1 register on some Kraits

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Certain versions of the Krait processor don't report that they
support the fused multiply accumulate instruction via the MVFR1
register despite the fact that they actually do. Unfortunately we
use this register to identify support for VFPv4. Override the
hwcap on all Krait processors to indicate support for VFPv4 to
workaround this.

Tested-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Stephen Boyd 2014-11-10 21:56:40 +01:00 committed by Russell King
parent 1ca8bf6f7b
commit 6f0f2a9f0f
1 changed files with 3 additions and 2 deletions
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5
arch/arm/mm/proc-v7.S
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@ -593,9 +593,10 @@ __krait_proc_info:
/*
* Some Krait processors don't indicate support for SDIV and UDIV
* instructions in the ARM instruction set, even though they actually
* do support them.
* do support them. They also don't indicate support for fused multiply
* instructions even though they actually do support them.
*/
__v7_proc __v7_setup, hwcaps = HWCAP_IDIV
__v7_proc __v7_setup, hwcaps = HWCAP_IDIV | HWCAP_VFPv4
.size __krait_proc_info, . - __krait_proc_info
/*