linux-kernel - Re: [PATCH v5 6/9] coresight: add support for CPU debug module

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Message-ID: <20170330135145.GA26911@leoy-linaro>
Date:   Thu, 30 Mar 2017 21:51:45 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     Suzuki K Poulose <Suzuki.Poulose@....com>
Cc:     Mike Leach <mike.leach@...aro.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Jonathan Corbet <corbet@....net>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Wei Xu <xuwei5@...ilicon.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Guodong Xu <guodong.xu@...aro.org>,
        John Stultz <john.stultz@...aro.org>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        linux-clk@...r.kernel.org, Sudeep Holla <sudeep.holla@....com>
Subject: Re: [PATCH v5 6/9] coresight: add support for CPU debug module

On Thu, Mar 30, 2017 at 10:00:30AM +0100, Suzuki K Poulose wrote:

[...]

> Leo,
> 
> Also, it would be good to restore the PRCR register back to the original state
> after we read the registers (if we changed them). I am exploring ways to make
> use of this feature on demand (e.g, tie it to sysrq-t or sysrq-l) and not just
> at panic time. So it would be good to have the state restored to not affect the
> normal functioning even after dumping the registers.

Got it. Will take care for this.

Thanks,
Leo Yan

> PS: I have a small hack to hook this into a sysrq-x at runtime, but on a second thought
> it is better not to consume the key and rather tie it to something which already exist,
> as mentioned above.
> 
> Thanks
> Suzuki