From: Pierre Yves MORDRET <pierre-yves.mordret@st.com>
To: Wolfram Sang <wsa@the-dreams.de>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>,
Alexandre Torgue <alexandre.torgue@st.com>,
<linux-i2c@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>
Subject: Re: [RESEND PATCH v1 6/6] i2c: i2c-stm32f7: Implement I2C recovery mechanism
Date: Mon, 19 Mar 2018 09:51:07 +0100 [thread overview]
Message-ID: <2672947b-46b2-7bd7-ac13-501db8bde72b@st.com> (raw)
In-Reply-To: <20180317204720.mclh4jw5owobbtww@ninjato>
Yes. Recovery mechanism is triggered whenever a busy line is detected.
This busy state can be checked by sw when either SDA or SCL is low: a bit is set
by Hw for this purpose.
On busy state I2C is reconfigured and lines are released the time of recovery.
Regards
On 03/17/2018 09:47 PM, Wolfram Sang wrote:
> On Mon, Mar 12, 2018 at 11:53:43AM +0100, Pierre-Yves MORDRET wrote:
>> Feature prevents I2C lock-ups. Mechanism resets I2C state machine
>> and releases SCL/SDA signals but preserves I2C registers.
>
> Does it release SDA when held down by the slave? Because that is what
> the recovery mechanism is for.
>
next prev parent reply other threads:[~2018-03-19 8:51 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-12 10:53 [RESEND PATCH v1 0/6] Add different features for I2C Pierre-Yves MORDRET
2018-03-12 10:53 ` [RESEND PATCH v1 1/6] i2c: i2c-stm32f7: Add 10-bit address support Pierre-Yves MORDRET
2018-03-12 10:53 ` [RESEND PATCH v1 2/6] i2c: i2c-stm32f7: Add slave support Pierre-Yves MORDRET
2018-03-17 20:51 ` Wolfram Sang
2018-03-19 8:41 ` Pierre Yves MORDRET
2018-03-20 9:52 ` Wolfram Sang
2018-03-20 10:17 ` Pierre Yves MORDRET
2018-03-21 10:47 ` Pierre Yves MORDRET
2018-03-12 10:53 ` [RESEND PATCH v1 3/6] i2c: i2c-stm32f7: Add initial SMBus protocols support Pierre-Yves MORDRET
2018-03-13 12:52 ` kbuild test robot
2018-03-13 12:52 ` [PATCH] i2c: i2c-stm32f7: fix semicolon.cocci warnings kbuild test robot
2018-03-12 10:53 ` [RESEND PATCH v1 4/6] i2c: i2c-stm32: Add generic DMA API Pierre-Yves MORDRET
2018-03-12 10:53 ` [RESEND PATCH v1 5/6] i2c: i2c-stm32f7: Add DMA support Pierre-Yves MORDRET
2018-03-14 9:06 ` kbuild test robot
2018-03-12 10:53 ` [RESEND PATCH v1 6/6] i2c: i2c-stm32f7: Implement I2C recovery mechanism Pierre-Yves MORDRET
2018-03-17 20:47 ` Wolfram Sang
2018-03-19 8:51 ` Pierre Yves MORDRET [this message]
2018-03-20 9:31 ` Pierre Yves MORDRET
2018-03-20 9:42 ` Wolfram Sang
2018-03-20 9:45 ` Pierre Yves MORDRET
2018-03-19 9:36 ` Phil Reid
2018-03-19 16:25 ` Pierre Yves MORDRET
-- strict thread matches above, loose matches on Subject: below --
2018-02-27 9:48 [RESEND PATCH v1 0/6] Add different features for I2C Pierre-Yves MORDRET
2018-02-27 9:48 ` [RESEND PATCH v1 6/6] i2c: i2c-stm32f7: Implement I2C recovery mechanism Pierre-Yves MORDRET
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