From: "sxauwsk@163.com" <sxauwsk@163.com>
To: Shubhrajyoti Datta <shubhrajyoti.datta@gmail.com>
Cc: Wolfram Sang <wsa@the-dreams.de>,
Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>,
linux-kernel <linux-kernel@vger.kernel.org>,
Michal Simek <michal.simek@xilinx.com>,
linux-i2c <linux-i2c@vger.kernel.org>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>
Subject: Re: Re: [PATCH v2] i2c: cadence: try reset when master receive arbitration lost
Date: Tue, 5 Nov 2019 16:47:53 +0800 [thread overview]
Message-ID: <2019110516474778997625@163.com> (raw)
In-Reply-To: CAKfKVtEwHcydp=+hNhG91h3qbMoYOPq7jEYjbuAVrWXT53DC3Q@mail.gmail.com
>Hi Shikai,
>
>On Tue, Feb 19, 2019 at 8:19 AM Shikai Wang <sxauwsk@163.com> wrote:
>>
>> When the adapter receive arbitration lost error interrupts,
>> cdns_i2c_master_xfer return to the caller directly instead of resetting
>> the adapter which resulted in the adapter being out of control.
>>
>> So when driver detect err_status such as arbitration lost,
>> then try to repair and fix it.
>>
>I am missing the issue that you are facing.
>You are having a multimaster scenario and getting arbitration lost.
>
>the current code would attempt a retry did that lead to any issues?
>
>Can you explain the issue that you are facing?
Of cource, The following describe my situation.
In my product, Touchscreen connect to zynq-7000 XC7Z010 by i2c bus( Just connect only one i2c-device of touchscreen),
when user tap Touchscreen, Touchscreen interrupt send to CPU and notifyed i2c-driver to obtain location data by i2c-bus,
when Tap the screen frequently, sometimes CPU get interrupt from touchscreen and try to obtain data, then detect arbitration lost,
Although i2c-driver try three times, it's useless.
Actually i2c clock-line and data-line keep high, that mean i2c bus free.
Once this situation occur, i2c-control did't work anynay but cpu receive interrputs still.
I am sorry that I have't found a good solution for this issuse;
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next prev parent reply other threads:[~2019-11-05 8:47 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-19 1:24 [PATCH v2] i2c: cadence: try reset when master receive arbitration lost Shikai Wang
2019-02-23 9:48 ` Wolfram Sang
2019-03-09 9:44 ` Wolfram Sang
2019-03-09 9:49 ` Wolfram Sang
2019-11-05 7:42 ` Shubhrajyoti Datta
2019-11-05 8:47 ` sxauwsk [this message]
2019-11-07 6:13 ` Shubhrajyoti Datta
2019-11-08 12:25 ` sxauwsk
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