From: Lee Jones <lee.jones@linaro.org>
To: Mark Jonas <toertel@gmail.com>
Cc: Rob Herring <robh+dt@kernel.org>,
Support Opensource <support.opensource@diasemi.com>,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
Adam.Thomson.Opensource@diasemi.com,
stwiss.opensource@diasemi.com, marek.vasut@gmail.com,
"RUAN Tingquan (BT-FIR/ENG1-Zhu)" <Tingquan.Ruan@cn.bosch.com>,
"Streidl Hubert (BT-FIR/ENG1-Grb)" <Hubert.Streidl@de.bosch.com>,
"Jonas Mark (BT-FIR/ENG1-Grb)" <Mark.Jonas@de.bosch.com>
Subject: Re: [PATCH 1/1] mfd: da9063: Support SMBus and I2C mode
Date: Tue, 26 Jan 2021 08:23:15 +0000 [thread overview]
Message-ID: <20210126082315.GE4903@dell> (raw)
In-Reply-To: <CAEE5dN34ywfT9DUqwzrog_ujEANYioYxJbJ8M=8Om_-=7uJHcg@mail.gmail.com>
On Mon, 25 Jan 2021, Mark Jonas wrote:
> Hi,
>
> I also intended to send a cover-letter but it was somehow lost on the
> way. Here it is:
>
> On an NXP i.MX6 Solo processor we are running an application which
> makes use of real-time threads (SCHED_RR). In combination with a
> DA9063 we experienced (rare) random shut-downs and reboots. We found
> that the issue was caused by a combination of the (default) DA9063
> SMBus mode and non-atomic I2C transactions of the i.MX6 I2C driver.
> Because a transaction could be idle for longer than the SMBus clock
> time-out due to a real-time thread the DA9063 would time-out and
> receive the second half of the transaction as an unintended message.
>
> The solution we are giving to review in this patch is to allow using
> the I2C mode of the DA9063. We kindly ask for feedback and eventually
> hope for an integration to the mainline.
>
> Because we are on a vendor kernel we were not able to test this patch
> on the current mainline kernel. Though, we tested a (very similar)
> patch on our (close to mainline) Linux 4.14 and 5.4 vendor kernels.
This is the 3rd cover-letter I've received now! :)
--
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
Follow Linaro: Facebook | Twitter | Blog
next prev parent reply other threads:[~2021-01-26 17:50 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-25 12:54 [PATCH 0/1] mfd: da9063: Support SMBus and I2C mode Mark Jonas
2021-01-25 12:54 ` [PATCH 1/1] " Mark Jonas
2021-01-25 18:49 ` Jonas Mark (BT-FIR/ENG1-Grb)
2021-01-25 18:58 ` Mark Jonas
2021-01-26 8:23 ` Lee Jones [this message]
2021-01-28 14:50 ` Adam Thomson
2021-01-28 16:09 ` AW: " Jonas Mark (BT-FIR/ENG1-Grb)
2021-01-28 20:53 ` Wolfram Sang
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