linux-kernel - Re: [PATCH 1/2] arm-smmu-qcom: Ensure the qcom

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Date:   Mon, 23 Nov 2020 15:46:59 +0000
From:   Will Deacon <will@...nel.org>
To:     lkml <linux-kernel@...r.kernel.org>,
        John Stultz <john.stultz@...aro.org>
Cc:     catalin.marinas@....com, kernel-team@...roid.com,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        iommu@...ts.linux-foundation.org, Marc Zyngier <maz@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Maulik Shah <mkshah@...eaurora.org>,
        Saravana Kannan <saravanak@...gle.com>,
        Lina Iyer <ilina@...eaurora.org>
Subject: Re: [PATCH 1/2] arm-smmu-qcom: Ensure the qcom_scm driver has finished probing

On Thu, 12 Nov 2020 22:05:19 +0000, John Stultz wrote:
> Robin Murphy pointed out that if the arm-smmu driver probes before
> the qcom_scm driver, we may call qcom_scm_qsmmu500_wait_safe_toggle()
> before the __scm is initialized.
> 
> Now, getting this to happen is a bit contrived, as in my efforts it
> required enabling asynchronous probing for both drivers, moving the
> firmware dts node to the end of the dtsi file, as well as forcing a
> long delay in the qcom_scm_probe function.
> 
> [...]

Applied only the first patch to arm64 (for-next/iommu/fixes), thanks!

[1/2] arm-smmu-qcom: Ensure the qcom_scm driver has finished probing
      https://git.kernel.org/arm64/c/72b55c96f3a5

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev