On Thu, Apr 26, 2012 at 06:00:09AM +0100, Yilu Mao wrote:We can't change L2 aux ctrl setting when do init because it has been enabled. But we have the requirement to handle core idle. For CA9 core idle, L2 controller may be reset. So we need to restore the L2 controller registers base on l2x0_saved_regs. This is why we need to keep the value in l2x0_saved_regs to be the same as real setting.On 04/24/2012 04:28 PM, Catalin Marinas wrote:On Tue, Apr 24, 2012 at 03:41:20AM +0100, Yilu Mao wrote:Sorry, I don't think so.+ l2x0_saved_regs.aux_ctrl = aux;
+
aux&= aux_mask;
aux |= aux_val;
I think that's the wrong place to save it, it should be after the
masking was done.
Anyway, if we cannot write this register in l2x0_init() because the L2
was enabled, do we expect the L2 to be disabled during resume?
This is the right place to save it because we must make sure the saved
aux_ctrl is the same as what it is set.
If we save it after masking was done, the saved value will be different
because we can't actually change the real setting.
And since we can't actually change the real setting on the resume path,
why do we need to save it anyway. Is your L2 cache disabled on the
resume path but not on the cold boot one?