linux-kernel - [PATCH v2 0/2] Restore voltages before rebooting of NVIDIA Tegra SoCs

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Message-Id: <20210516222103.28595-1-digetx@gmail.com>
Date:   Mon, 17 May 2021 01:21:00 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Michał Mirosław <mirq-linux@...e.qmqm.pl>,
        Nikola Milosavljević <mnidza@...look.com>
Cc:     linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org,
        Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>
Subject: [PATCH v2 0/2] Restore voltages before rebooting of NVIDIA Tegra SoCs

Hi,

Nikola Milosavljević reported that rebooting wasn't working properly on
Asus Transformer TF101, which is Tegra20-based tablet device.  We found
that TF101 and some other devices have bootloader which doesn't re-initialize
voltages properly on a reboot.  The problem is resolved by ensuring that
SoC voltages are at a levels that are suitable for the rebooting of the
SoC before reboot happens. This series adds reboot handler to the Tegra
regulator couplers, it bumps voltages on the reboot event.

Changelog:

v2: - Added ack from Mark Brown.

    - Rebased patches properly, thanks to Michał Mirosław for noticing
      this problem.

Dmitry Osipenko (2):
  regulator: core: Add regulator_sync_voltage_rdev()
  soc/tegra: regulators: Bump voltages on system reboot

 drivers/regulator/core.c               | 23 ++++++++
 drivers/soc/tegra/regulators-tegra20.c | 75 ++++++++++++++++++++++++-
 drivers/soc/tegra/regulators-tegra30.c | 78 +++++++++++++++++++++++++-
 include/linux/regulator/driver.h       |  1 +
 4 files changed, 175 insertions(+), 2 deletions(-)

-- 
2.30.2