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List:       linux-i2c
Subject:    Re: [PATCH V8 2/5] i2c: tegra: Add Bus Clear Master Support
From:       Dmitry Osipenko <digetx () gmail ! com>
Date:       2019-01-31 15:16:36
Message-ID: 5aacf5c7-13bb-c8ae-d8f2-259b0c3f3c81 () gmail ! com
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31.01.2019 9:16, Sowjanya Komatineni пишет:
> Bus clear feature of tegra i2c controller helps to recover from
> bus hang when i2c master loses the bus arbitration due to the
> slave device holding SDA LOW continuously for some unknown reasons.
> 
> Per I2C specification, the device that held the bus LOW should
> release it within 9 clock pulses.
> 
> During bus clear operation, Tegra I2C controller sends 9 clock
> pulses and terminates the transaction with STOP condition.
> Upon successful bus clear operation, bus goes to idle state and
> driver retries the transaction.
> 
> Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
> ---
> [V5/V6/V7/V8]: Same as V4
> [V4]: Added I2C Bus Clear support patch to this version of series.
> 
 
I haven't checked all of the bits in this patch, but at least -EAGAIN should work as \
expected on older Tegra's:

Reviewed-by: Dmitry Osipenko <digetx@gmail.com> 


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