Commit 6f0f2a9f authored Nov 10, 2014 by Stephen Boyd Committed by Russell King Nov 21, 2014

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



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>

parent 1ca8bf6f

arch/arm/mm/proc-v7.S

+3 −2

Original line number	Diff line number	Diff line
		@@ -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

		/*

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