linux-kernel - Re: [RFC PATCH v3 16/18] gpu: host1x: mipi: Split tegra_mipi_calibrate and tegra_mipi

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Date:   Fri, 17 Jul 2020 02:01:28 +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 v3 16/18] gpu: host1x: mipi: Split
 tegra_mipi_calibrate and tegra_mipi_wait

17.07.2020 01:49, Sowjanya Komatineni пишет:
>> What keeps MIPI clock enabled after completion of the
>> tegra_mipi_calibrate() invocation?
> 
> MIPI clock is disabled at end of tegra_mipi_calibrate and is re-enabled
> during tegra_mipi_wait.
> 
> I think I should fix this to keep the clock enabled till calibration
> results are latched.
> 
> All consumers of tegra_mipi_calibrate() will call tegra_mipi_wait().
> 
> So will remove clk_disable mipi clk at end of tegra_mipi_calibrate() and
> clk_enable mipi_clk at beginning of tegra_mipi_wait()

Isn't it possible to perform the calibration after enabling CSI and
before of starting the sensor streaming?