From: Suzuki K Poulose <suzuki.poulose@arm.com>
To: stephan@gerhold.net, agross@kernel.org, david.brown@linaro.org,
mathieu.poirier@linaro.org
Cc: linux-arm-msm@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Subject: Re: Coresight causes synchronous external abort on msm8916
Date: Wed, 19 Jun 2019 09:49:03 +0100 [thread overview]
Message-ID: <a51f117f-c48d-d3f4-c3d1-9b584e3a055f@arm.com> (raw)
In-Reply-To: <20190618202623.GA53651@gerhold.net>
Hi Stephan,
On 18/06/2019 21:26, Stephan Gerhold wrote:
> Hi,
>
> I'm trying to run mainline Linux on a smartphone with MSM8916 SoC.
> It works surprisingly well, but the coresight devices seem to cause the
> following crash shortly after userspace starts:
>
> Internal error: synchronous external abort: 96000010 [#1] PREEMPT SMP
...
>
> In this case I'm using a simple device tree similar to apq8016-sbc,
> but it also happens using something as simple as msm8916-mtp.dts
> on this particular device.
> (Attached: dmesg log with msm8916-mtp.dts and arm64 defconfig)
>
> I can avoid the crash and boot without any further problems by disabling
> every coresight device defined in msm8916.dtsi, e.g.:
>
> tpiu@820000 { status = "disabled"; };
...
>
> I don't have any use for coresight at the moment,
> but it seems somewhat odd to put this in the device specific dts.
>
> Any idea what could be causing this crash?
This is mostly due to the missing power domain support. The CoreSight
components are usually in a debug power domain. So unless that is turned on,
(either by specifying proper power domain ids for power management protocol
supported by the firmware OR via other hacks - e.g, connecting a DS-5 to
keep the debug power domain turned on , this works on Juno -).
> I'm not sure if this is a device-specific issue or possibly some kind of
> configuration problem.
> Or is this feature only working on development boards?
Cheers
Suzuki
next prev parent reply other threads:[~2019-06-19 8:49 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-18 20:26 Coresight causes synchronous external abort on msm8916 Stephan Gerhold
2019-06-18 20:40 ` Mathieu Poirier
2019-06-19 17:39 ` Stephan Gerhold
2019-06-19 8:49 ` Suzuki K Poulose [this message]
2019-06-19 18:39 ` Stephan Gerhold
2019-06-19 20:16 ` Mathieu Poirier
2019-06-20 8:53 ` Suzuki K Poulose
2019-06-20 9:38 ` Sudeep Holla
2019-06-21 16:06 ` Stephan Gerhold
2019-06-21 16:16 ` Suzuki K Poulose
2019-06-21 16:30 ` Sudeep Holla
2019-06-20 6:29 ` Sai Prakash Ranjan
2019-06-20 9:06 ` Suzuki K Poulose
2019-06-20 9:51 ` Sai Prakash Ranjan
2019-06-20 10:08 ` Suzuki K Poulose
2019-06-20 10:10 ` Sai Prakash Ranjan
2019-06-20 15:00 ` Mathieu Poirier
2019-06-20 9:35 ` Sudeep Holla
2019-06-21 16:10 ` Stephan Gerhold
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