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From: Dmitry Osipenko <digetx@gmail.com>
To: Sowjanya Komatineni <skomatineni@nvidia.com>,
	thierry.reding@gmail.com, jonathanh@nvidia.com,
	frankc@nvidia.com, hverkuil@xs4all.nl, sakari.ailus@iki.fi,
	robh+dt@kernel.org, helen.koike@collabora.com
Cc: gregkh@linuxfoundation.org, linux-media@vger.kernel.org,
	devicetree@vger.kernel.org, linux-tegra@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH v7 09/10] media: tegra-video: Add CSI MIPI pads calibration
Date: Sat, 1 Aug 2020 04:04:38 +0300
Message-ID: <af5506d4-52a4-8693-b95b-d1e0a9a53e79@gmail.com> (raw)
In-Reply-To: <1596231144-12554-10-git-send-email-skomatineni@nvidia.com>

01.08.2020 00:32, Sowjanya Komatineni пишет:
> CSI MIPI pads need to be enabled and calibrated for capturing from
> the external sensor or transmitter.
> 
> MIPI CAL unit calibrates MIPI pads pull-up, pull-down and termination
> impedances. Calibration is done by co-work of MIPI BIAS pad and MIPI
> CAL control unit.
> 
> Triggering calibration start can happen any time after MIPI pads are
> enabled but calibration results will be latched and applied to MIPI
> pads by MIPI CAL unit only when the link is in LP11 state and then
> calibration status register gets updated.
> 
> This patch enables CSI MIPI pads and calibrates them during streaming.
> 
> Tegra CSI receiver is able to catch the very first clock transition.
> So, CSI receiver is always enabled prior to sensor streaming and
> trigger of calibration start is done during CSI subdev streaming and
> status of calibration is verified after sensor stream on.
> 
> Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
> ---
>  drivers/staging/media/tegra-video/TODO  |  1 -
>  drivers/staging/media/tegra-video/csi.c | 61 +++++++++++++++++++++++++++++++--
>  drivers/staging/media/tegra-video/csi.h |  2 ++
>  drivers/staging/media/tegra-video/vi.c  | 28 ++++++++++++---
>  4 files changed, 84 insertions(+), 8 deletions(-)

Reviewed-by: Dmitry Osipenko <digetx@gmail.com>

  reply index

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-31 21:32 [PATCH v7 00/10] Support for Tegra video capture from external sensor Sowjanya Komatineni
2020-07-31 21:32 ` [PATCH v7 01/10] media: tegra-video: Fix channel format alignment Sowjanya Komatineni
2020-07-31 21:32 ` [PATCH v7 02/10] media: tegra-video: Enable TPG based on kernel config Sowjanya Komatineni
2020-07-31 21:32 ` [PATCH v7 03/10] media: tegra-video: Update format lookup to offset based Sowjanya Komatineni
2020-07-31 21:32 ` [PATCH v7 04/10] dt-bindings: tegra: Update VI and CSI bindings with port info Sowjanya Komatineni
2020-07-31 21:32 ` [PATCH v7 05/10] media: tegra-video: Separate CSI stream enable and disable implementations Sowjanya Komatineni
2020-07-31 21:32 ` [PATCH v7 06/10] media: tegra-video: Add support for external sensor capture Sowjanya Komatineni
2020-08-01  0:59   ` Dmitry Osipenko
2020-07-31 21:32 ` [PATCH v7 07/10] media: tegra-video: Add support for selection ioctl ops Sowjanya Komatineni
2020-07-31 21:32 ` [PATCH v7 08/10] gpu: host1x: mipi: Keep MIPI clock enabled till calibration is done Sowjanya Komatineni
2020-07-31 21:32 ` [PATCH v7 09/10] media: tegra-video: Add CSI MIPI pads calibration Sowjanya Komatineni
2020-08-01  1:04   ` Dmitry Osipenko [this message]
2020-07-31 21:32 ` [PATCH v7 10/10] media: tegra-video: Compute settle times based on the clock rate Sowjanya Komatineni

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