linux-kernel - Re: [RFC PATCH v5 12/14] gpu: host1x: mipi: Keep MIPI clock enabled till calibration is done

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Message-ID: <d291d306-55d4-2264-dc05-0e47f0dfef20@gmail.com>
Date:   Wed, 29 Jul 2020 20:08:05 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Sowjanya Komatineni <skomatineni@...dia.com>,
        thierry.reding@...il.com, jonathanh@...dia.com, frankc@...dia.com,
        hverkuil@...all.nl, sakari.ailus@....fi, robh+dt@...nel.org,
        helen.koike@...labora.com
Cc:     sboyd@...nel.org, gregkh@...uxfoundation.org,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-i2c@...r.kernel.org
Subject: Re: [RFC PATCH v5 12/14] gpu: host1x: mipi: Keep MIPI clock enabled
 till calibration is done

28.07.2020 19:04, Sowjanya Komatineni пишет:
...
>>> +void tegra_mipi_cancel_calibration(struct tegra_mipi_device *device)
>>> +{
>> Doesn't MIPI_CAL need to be reset here?
> No need to reset MIPI CAL

Could you please explain why. There is a calibration state-machine that
apparently needs to be returned into initial state, does it return by
itself?

TRM says that MIPI block needs to be reset before of starting
calibration process. The reset is completely missing in the driver, I
assume it needs to be corrected with another patch.