ARM: Introduce erratum workaround for 621766
621766: Under a specific set of conditions, executing a sequence of NEON or vfp load instructions can cause processor deadlock Impacts: Every Cortex-A8 processors with revision lower than r2p1 Work around: Set L1NEON to 1 Based on ARM errata Document revision 20.0 (13 Nov 2010) Signed-off-by: Nishanth Menon <nm@ti.com> Tested-by: Matt Porter <mporter@konsulko.com> Reviewed-by: Tom Rini <trini@konsulko.com>utp
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@ -695,6 +695,7 @@ The following options need to be configured:
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specific checks, but expect no product checks.
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specific checks, but expect no product checks.
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CONFIG_ARM_ERRATA_430973
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CONFIG_ARM_ERRATA_430973
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CONFIG_ARM_ERRATA_454179
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CONFIG_ARM_ERRATA_454179
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CONFIG_ARM_ERRATA_621766
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CONFIG_ARM_ERRATA_798870
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CONFIG_ARM_ERRATA_798870
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- Tegra SoC options:
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- Tegra SoC options:
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@ -213,6 +213,19 @@ skip_errata_454179:
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pop {r1-r5} @ Restore the cpu info - fall through
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pop {r1-r5} @ Restore the cpu info - fall through
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skip_errata_430973:
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skip_errata_430973:
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#endif
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#ifdef CONFIG_ARM_ERRATA_621766
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cmp r2, #0x21 @ Only on < r2p1
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bge skip_errata_621766
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mrc p15, 0, r0, c1, c0, 1 @ Read ACR
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orr r0, r0, #(0x1 << 5) @ Set L1NEON bit
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push {r1-r5} @ Save the cpu info registers
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bl v7_arch_cp15_set_acr
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pop {r1-r5} @ Restore the cpu info - fall through
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skip_errata_621766:
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#endif
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#endif
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mov pc, r5 @ back to my caller
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mov pc, r5 @ back to my caller
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