From: Peter Rosin <peda@axentia.se>
To: Wolfram Sang <wsa@the-dreams.de>, Lee Jones <lee.jones@linaro.org>
Cc: "mark.rutland@arm.com" <mark.rutland@arm.com>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"agross@kernel.org" <agross@kernel.org>,
"robh+dt@kernel.org" <robh+dt@kernel.org>,
"bjorn.andersson@linaro.org" <bjorn.andersson@linaro.org>,
"vkoul@kernel.org" <vkoul@kernel.org>,
"alokc@codeaurora.org" <alokc@codeaurora.org>,
"linux-i2c@vger.kernel.org" <linux-i2c@vger.kernel.org>,
"linux-arm-msm@vger.kernel.org" <linux-arm-msm@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v3 1/1] i2c: qcom-geni: Provide an option to disable DMA processing
Date: Thu, 5 Sep 2019 13:58:24 +0000 [thread overview]
Message-ID: <3458ed2a-ae49-b46b-3e89-ce039a2749b4@axentia.se> (raw)
In-Reply-To: <20190905134941.GG1157@kunai>
On 2019-09-05 15:49, Wolfram Sang wrote:
> Hi Lee,
>
> I understand you are in a hurry, but please double check before
> sending...
Linus indicated that an rc8 is coming up, which should provide an extra week.
https://lwn.net/Articles/798152/
> On Thu, Sep 05, 2019 at 11:22:47AM +0100, Lee Jones wrote:
>> We have a production-level laptop (Lenovo Yoga C630) which is exhibiting
>> a rather horrific bug. When I2C HID devices are being scanned for at
>> boot-time the QCom Geni based I2C (Serial Engine) attempts to use DMA.
>> When it does, the laptop reboots and the user never sees the OS.
>>
>> The beautiful thing about this approach is that, *if* the Geni SE DMA
>> ever starts working, we can remove the C code and any old properties
>> left in older DTs just become NOOP. Older kernels with newer DTs (less
>> of a priority) *still* will not work - but they do not work now anyway.
>
> ... becasue this paragraph doesn't fit anymore. Needs to be reworded.
>
>>
>> Fixes: 8bc529b25354 ("soc: qcom: geni: Add support for ACPI")
>
> As said in the other thread, I don't get it, but this is not a show
> stopper for me.
WAG: because ACPI made some driver load at all, and when it
did it something started happening which crashed some machines.
Cheers,
Peter
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next prev parent reply other threads:[~2019-09-05 13:58 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-05 10:22 [PATCH v3 1/1] i2c: qcom-geni: Provide an option to disable DMA processing Lee Jones
2019-09-05 13:49 ` Wolfram Sang
2019-09-05 13:58 ` Peter Rosin [this message]
2019-09-05 14:33 ` Lee Jones
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