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Commit 017ee4b0 authored by Mitchel Humpherys's avatar Mitchel Humpherys Committed by Patrick Daly
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iommu/arm-smmu: Make fault triggering more reliable 



We're currently disabling clocks/power immediately after writing to
FSRRESTORE, but if the fault is not handled before we disable the
clocks/power then the fault could be lost.  Add a 1-second sleep after
writing to FSRRESTORE to give the interrupt time to fire before turning
clocks/power back off.

Change-Id: Ieeba49686da5da92e43f03c3c593166592184433
Signed-off-by: default avatarMitchel Humpherys <mitchelh@codeaurora.org>
Signed-off-by: default avatarPatrick Daly <pdaly@codeaurora.org>
parent a52d6cc3

drivers/iommu/arm-smmu.c

+2 −0
Original line number Diff line number Diff line
@@ -1993,6 +1993,8 @@ static void arm_smmu_trigger_fault(struct iommu_domain *domain, 
	dev_err(smmu->dev, "Writing 0x%lx to FSRRESTORE on cb %d\n",

		flags, cfg->cbndx);

	writel_relaxed(flags, cb_base + ARM_SMMU_CB_FSRRESTORE);

	/* give the interrupt time to fire... */

	msleep(1000);

}



static struct iommu_ops arm_smmu_ops = {