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ARC: guard dsp early init against non ARCv2 

As of today we guard early DSP init code with
ARC_AUX_DSP_BUILD (0x7A) BCR check to verify that we have
CPU with DSP configured. However that's not enough as in
ARCv1 CPU the same BCR (0x7A) is used for checking MUL/MAC
instructions presence.

So, let's guard DSP early init against non ARCv2.

Fixes: 4827d0cf74 ("ARC: handle DSP presence in HW")
Reported-by: Angelo Ribeiro <angelor@synopsys.com>
Suggested-by: Jose Abreu <oabreu@synopsys.com>
Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
This commit is contained in:
Eugeniy Paltsev 2020-04-28 21:50:24 +03:00 committed by Vineet Gupta
parent 799587d573
commit 40db9367ec
1 changed files with 2 additions and 0 deletions
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2
arch/arc/include/asm/dsp-impl.h
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@ -15,12 +15,14 @@
/* clobbers r5 register */
.macro DSP_EARLY_INIT
#ifdef CONFIG_ISA_ARCV2
lr r5, [ARC_AUX_DSP_BUILD]
bmsk r5, r5, 7
breq r5, 0, 1f
mov r5, DSP_CTRL_DISABLED_ALL
sr r5, [ARC_AUX_DSP_CTRL]
1:
#endif
.endm
/* clobbers r10, r11 registers pair */