linux-kernel - Re: [PATCH] arm64: dts: qcom: msm8998-mtp: Disable funnel 4 and 5

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Message-ID: <CAOCk7NrYxPRsT+wqgW=ShkYNnkuLfuzzVACDL7Zn-phKSgqvfw@mail.gmail.com>
Date:   Mon, 9 Mar 2020 13:47:38 -0600
From:   Jeffrey Hugo <jeffrey.l.hugo@...il.com>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Andy Gross <agross@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Jeffrey Hugo <jhugo@...eaurora.org>,
        MSM <linux-arm-msm@...r.kernel.org>,
        DTML <devicetree@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arm64: dts: qcom: msm8998-mtp: Disable funnel 4 and 5

On Sat, Mar 7, 2020 at 10:58 PM Bjorn Andersson
<bjorn.andersson@...aro.org> wrote:
>
> Disable Coresight funnel 4 and 5, for now, as these causes the MTP to
> crash when clock late_initcall disables unused clocks.
>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>

Reviewed-by: Jeffrey Hugo <jeffrey.l.hugo@...il.com>

I'm guessing that these are accessed by something else in the system,
without properly putting its own vote or something.  Similar to
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?h=v5.6-rc5&id=12eced09cd301aa7b1868a67c50a651c2aacd363

If I get some time, I'll try to repro and hopefully identify what is
exactly going wrong.