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: sboyd@kernel.org, gregkh@linuxfoundation.org,
linux-media@vger.kernel.org, devicetree@vger.kernel.org,
linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-i2c@vger.kernel.org
Subject: Re: [RFC PATCH v3 16/18] gpu: host1x: mipi: Split tegra_mipi_calibrate and tegra_mipi_wait
Date: Fri, 17 Jul 2020 18:01:58 +0300 [thread overview]
Message-ID: <080b30c7-1dce-dd2f-dd96-40f6e25da4d6@gmail.com> (raw)
In-Reply-To: <ca8f2184-de30-03ec-9caf-e20a22d96a77@nvidia.com>
17.07.2020 07:46, Sowjanya Komatineni пишет:
...
> Looks like sequence posted in TRM need to be updated clearly for proper
> MIPI CAL start and wait.
>
> Correct steps should be like below
>
> 1. Set up CSI registers for use case such as number of lanes, virtual
> channel, etc.
> 2. Initialize and power up CSI CIL interface
> 3. Program MIPI CAL bias pads, cal configs, cal control registers and
> enable calibration start
> 4. Power up camera through the I2C interface and start sensor streaming
> through the I2C
>
> Note: All sensors might not leave pads in LP-11 state as sensor may be
> power down when not in use.
>
> So start streaming prior to checking for calibration done status as
> LP-11 -> HS transition happens during sensor stream and calibration
> logic can apply results to pads and update done status,
>
> 5. Wait for done signal from calibration logic
>
> 6. perform frame capture thru VI
> 7. Frame done, CSI goes back to stop state, LP11
>
> Will work internally to correct sequence in TRM ...
Will be nice to have an updated TRM, thank you!
Also, what about the auto-calibration? Isn't it needed to be enabled for
CSI?
> In mipi driver will update as below to have mipi clk enabled till
> calibration status check is done.
>
> Always tegra_mipi_wait() followes tegra_mipi_calibrate() in both DSI and
> CSI. So below sequence should work good.
>
> tegra_mipi_calibrate()
>
> - clk_enable mipi cal
> - program mipi cal registers (bias pads cfgs, mipi cal ctrl and trigger
> calibration start)
>
> tegra_mipi_wait()
> - read mipi cal status and wait for active and done bits
> - clk_disable mipi cal
Maybe then it should be better to rename the functions like this:
tegra_mipi_calibrate() -> tegra_mipi_start_calibration()
tegra_mipi_wait() -> tegra_mipi_finish_calibration().
and there also should be tegra_mipi_cancel_calibration().
Example:
tegra_mipi_start_calibration();
ret = v4l2_subdev_call(subdev, video, s_stream, on);
if (ret < 0) {
tegra_mipi_cancel_calibration();
goto err;
}
tegra_mipi_finish_calibration();
next prev parent reply other threads:[~2020-07-17 15:02 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-15 4:20 [RFC PATCH v3 00/18] Support for Tegra video capture from external sensor Sowjanya Komatineni
2020-07-15 4:20 ` [RFC PATCH v3 01/18] dt-bindings: i2c: tegra: Document Tegra210 VI I2C clocks and power-domains Sowjanya Komatineni
2020-07-16 13:25 ` Thierry Reding
2020-07-15 4:20 ` [RFC PATCH v3 02/18] arm64: tegra: Add missing clocks and power-domains to Tegra210 VI I2C Sowjanya Komatineni
2020-07-16 13:25 ` Thierry Reding
2020-07-15 4:20 ` [RFC PATCH v3 03/18] i2c: tegra: Don't mark VI I2C as IRQ safe runtime PM Sowjanya Komatineni
2020-07-15 4:20 ` [RFC PATCH v3 04/18] i2c: tegra: Remove NULL pointer check before clk_enable/disable/prepare/unprepare Sowjanya Komatineni
2020-07-16 20:25 ` Dmitry Osipenko
2020-07-15 4:20 ` [RFC PATCH v3 05/18] i2c: tegra: Fix the error path in tegra_i2c_runtime_resume Sowjanya Komatineni
2020-07-15 4:20 ` [RFC PATCH v3 06/18] i2c: tegra: Fix runtime resume to re-init VI I2C Sowjanya Komatineni
2020-07-15 4:20 ` [RFC PATCH v3 07/18] i2c: tegra: Avoid tegra_i2c_init_dma() for Tegra210 vi i2c Sowjanya Komatineni
2020-07-15 4:20 ` [RFC PATCH v3 08/18] media: tegra-video: Fix channel format alignment Sowjanya Komatineni
2020-07-15 4:20 ` [RFC PATCH v3 09/18] media: tegra-video: Enable TPG based on kernel config Sowjanya Komatineni
2020-07-15 4:20 ` [RFC PATCH v3 10/18] media: tegra-video: Update format lookup to offset based Sowjanya Komatineni
2020-07-15 4:20 ` [RFC PATCH v3 11/18] dt-bindings: tegra: Update VI and CSI bindings with port info Sowjanya Komatineni
2020-07-16 19:09 ` Rob Herring
2020-07-15 4:20 ` [RFC PATCH v3 12/18] media: tegra-video: Add support for external sensor capture Sowjanya Komatineni
2020-07-15 4:20 ` [RFC PATCH v3 13/18] media: tegra-video: Add support for selection ioctl ops Sowjanya Komatineni
2020-07-15 4:20 ` [RFC PATCH v3 14/18] gpu: host1x: mipi: Update tegra_mipi_request() to be node based Sowjanya Komatineni
2020-07-16 20:26 ` Dmitry Osipenko
2020-07-15 4:20 ` [RFC PATCH v3 15/18] gpu: host1x: mipi: Use readl_relaxed_poll_timeout in tegra_mipi_wait Sowjanya Komatineni
2020-07-15 4:20 ` [RFC PATCH v3 16/18] gpu: host1x: mipi: Split tegra_mipi_calibrate and tegra_mipi_wait Sowjanya Komatineni
2020-07-16 20:38 ` Dmitry Osipenko
2020-07-16 21:09 ` Sowjanya Komatineni
2020-07-16 21:18 ` Dmitry Osipenko
2020-07-16 22:49 ` Sowjanya Komatineni
2020-07-16 23:01 ` Dmitry Osipenko
2020-07-16 23:06 ` Sowjanya Komatineni
2020-07-16 23:09 ` Sowjanya Komatineni
2020-07-16 23:47 ` Dmitry Osipenko
2020-07-17 0:16 ` Sowjanya Komatineni
2020-07-17 4:46 ` Sowjanya Komatineni
2020-07-17 15:01 ` Dmitry Osipenko [this message]
2020-07-17 15:41 ` Sowjanya Komatineni
2020-07-17 20:14 ` Dmitry Osipenko
2020-07-15 4:20 ` [RFC PATCH v3 17/18] media: tegra-video: Add CSI MIPI pads calibration Sowjanya Komatineni
2020-07-15 4:20 ` [RFC PATCH v3 18/18] media: tegra-video: Compute settle times based on the clock rate Sowjanya Komatineni
2020-07-17 10:54 ` [RFC PATCH v3 00/18] Support for Tegra video capture from external sensor Hans Verkuil
2020-07-17 16:34 ` Sowjanya Komatineni
2020-07-17 17:08 ` Hans Verkuil
2020-07-17 17:23 ` Sowjanya Komatineni
2020-07-17 17:38 ` Sowjanya Komatineni
2020-07-17 17:48 ` Sowjanya Komatineni
2020-07-20 4:41 ` Sowjanya Komatineni
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