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ARM: pm: avoid writing the auxillary control register for ARMv7 

For ARMv7 kernels running in the non-secure world, writing to the
auxillary control register causes an abort, so we must avoid directly
writing the auxillary control register.  If the ACR has already been
reinitialized by SoC code, don't try to restore it.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2011-08-26 22:44:59 +01:00
parent f35235a315
commit 2590415716
1 changed files with 3 additions and 1 deletions
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4
arch/arm/mm/proc-v7.S
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@ -248,7 +248,9 @@ ENTRY(cpu_v7_do_resume)
mcr p15, 0, r7, c2, c0, 0 @ TTB 0
mcr p15, 0, r8, c2, c0, 1 @ TTB 1
mcr p15, 0, ip, c2, c0, 2 @ TTB control register
mcr p15, 0, r10, c1, c0, 1 @ Auxiliary control register
mrc p15, 0, r4, c1, c0, 1 @ Read Auxiliary control register
teq r4, r10 @ Is it already set?
mcrne p15, 0, r10, c1, c0, 1 @ No, so write it
mcr p15, 0, r11, c1, c0, 2 @ Co-processor access control
ldr r4, =PRRR @ PRRR
ldr r5, =NMRR @ NMRR