[PATCH] ARM: save/restore diagnostic register on ARMv7 suspend/resume

Shawn Guo shawn.guo at freescale.com
Wed Jun 18 05:39:08 PDT 2014

On Wed, Jun 18, 2014 at 11:40:09AM +0100, Will Deacon wrote:
> On Wed, Jun 18, 2014 at 09:49:58AM +0100, Shawn Guo wrote:
> > The CP15 diagnostic register holds ARM errata bits on ARMv7, so it
> > needs to be saved/restored on suspend/resume.  Otherwise, the
> > effectiveness of errata workaround gets lost together with diagnostic
> > register bit across suspend/resume cycle.
> This should be conditional on Cortex-A9, since this register is certainly
> not architected.

Ah, yes.  In that case, I should probably handle it at platform level to
avoid messing up generic ARMv7 suspend/resume routines.


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