linux-kernel - [PATCH v2 0/6] NVIDIA Tegra I2C driver fixes and improvements

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Message-Id: <20191228221654.28842-1-digetx@gmail.com>
Date:   Sun, 29 Dec 2019 01:16:48 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Laxman Dewangan <ldewangan@...dia.com>,
        Mikko Perttunen <cyndis@...si.fi>,
        Wolfram Sang <wsa@...-dreams.de>
Cc:     linux-i2c@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 0/6] NVIDIA Tegra I2C driver fixes and improvements

Hello,

This patchset adds support for atomic transfers which are required for
shutting down machine properly. Secondly, a (not)suspending I2C and some
other things are fixed/improved by this small series as well. Please review
and apply, thanks in advance!

Changelog:

v2: The series is renamed from "Tegra I2C: Support atomic transfers and
    correct suspend/resume" to "NVIDIA Tegra I2C driver fixes and
    improvements" because it now contains some more various changes.

    New patches in v2:

      i2c: tegra: Correct unwinding order on driver's probe error
      i2c: tegra: Prevent interrupt triggering after transfer timeout
      i2c: tegra: Use relaxed versions of readl/writel

    The "Rename I2C_PIO_MODE_MAX_LEN to I2C_PIO_MODE_PREFERRED_LEN" got an
    improved wording for the code's comment to I2C_PIO_MODE_PREFERRED_LEN.

    The "Support atomic transfers" also got some very minor tuning, like
    s/in_interrupt()/i2c_dev->is_curr_atomic_xfer/ in dvc_writel() that was
    missed in v1.

v1: The "i2c: tegra: Support atomic transfers" previously was sent out as
    a separate patch, but later I spotted that suspend/resume doesn't
    work properly. The "i2c: tegra: Fix suspending in active runtime PM
    state" patch depends on the atomic patch because there is a need to
    active IRQ-safe mode for the runtime PM by both patches.

    I fixed a missed doc-comment of the newly added "is_curr_atomic_xfer"
    structure field and added additional comment that explains why IRQ needs
    to be disabled for the atomic transfer in the "Support atomic transfers"
    patch.

    Lastly, I added a minor "i2c: tegra: Rename .." patch that helps to
    follow driver's code.

Dmitry Osipenko (6):
  i2c: tegra: Fix suspending in active runtime PM state
  i2c: tegra: Properly disable runtime PM on driver's probe error
  i2c: tegra: Prevent interrupt triggering after transfer timeout
  i2c: tegra: Support atomic transfers
  i2c: tegra: Rename I2C_PIO_MODE_MAX_LEN to I2C_PIO_MODE_PREFERRED_LEN
  i2c: tegra: Use relaxed versions of readl/writel

 drivers/i2c/busses/i2c-tegra.c | 198 ++++++++++++++++++++++-----------
 1 file changed, 134 insertions(+), 64 deletions(-)

-- 
2.24.0