From: Dmitry Osipenko <digetx@gmail.com>
To: Sowjanya Komatineni <skomatineni@nvidia.com>,
thierry.reding@gmail.com, jonathanh@nvidia.com,
mkarthik@nvidia.com, smohammed@nvidia.com, talho@nvidia.com
Cc: linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-i2c@vger.kernel.org
Subject: Re: [PATCH V8 2/5] i2c: tegra: Add Bus Clear Master Support
Date: Thu, 31 Jan 2019 18:16:36 +0300 [thread overview]
Message-ID: <5aacf5c7-13bb-c8ae-d8f2-259b0c3f3c81@gmail.com> (raw)
In-Reply-To: <1548915387-28826-2-git-send-email-skomatineni@nvidia.com>
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>
next prev parent reply other threads:[~2019-01-31 15:16 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-31 6:16 [PATCH V8 1/5] i2c: tegra: Sort all the include headers alphabetically Sowjanya Komatineni
2019-01-31 6:16 ` [PATCH V8 2/5] i2c: tegra: Add Bus Clear Master Support Sowjanya Komatineni
2019-01-31 12:44 ` Thierry Reding
2019-01-31 15:16 ` Dmitry Osipenko [this message]
2019-01-31 6:16 ` [PATCH V8 3/5] i2c: tegra: Add DMA Support Sowjanya Komatineni
2019-01-31 12:44 ` Thierry Reding
2019-01-31 16:41 ` Sowjanya Komatineni
2019-02-01 0:52 ` Dmitry Osipenko
2019-02-01 1:11 ` Sowjanya Komatineni
2019-02-01 3:14 ` Dmitry Osipenko
2019-02-01 4:19 ` Sowjanya Komatineni
2019-02-01 15:02 ` Dmitry Osipenko
2019-01-31 15:12 ` Dmitry Osipenko
2019-01-31 15:24 ` Dmitry Osipenko
2019-01-31 16:56 ` Sowjanya Komatineni
2019-01-31 17:11 ` Dmitry Osipenko
2019-01-31 17:25 ` Dmitry Osipenko
2019-01-31 17:38 ` Dmitry Osipenko
2019-01-31 17:38 ` Sowjanya Komatineni
2019-01-31 21:46 ` Sowjanya Komatineni
2019-02-01 0:54 ` Dmitry Osipenko
2019-01-31 6:16 ` [PATCH V8 4/5] i2c: tegra: Update transfer timeout Sowjanya Komatineni
2019-01-31 12:48 ` Thierry Reding
2019-01-31 6:16 ` [PATCH V8 5/5] i2c: tegra: Add I2C interface timing support Sowjanya Komatineni
2019-01-31 12:50 ` Thierry Reding
2019-01-31 12:45 ` [PATCH V8 1/5] i2c: tegra: Sort all the include headers alphabetically Thierry Reding
2019-01-31 15:14 ` Dmitry Osipenko
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