linux-kernel - Re: [PATCH v10 4/4] [media] platform: Add Synopsys DesignWare HDMI RX Controller Driver

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Date:   Mon, 11 Dec 2017 20:06:04 +0100
From:   Philippe Ombredanne <pombredanne@...b.com>
To:     Jose Abreu <Jose.Abreu@...opsys.com>
Cc:     Linux Media Mailing List <linux-media@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Joao Pinto <Joao.Pinto@...opsys.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Sylwester Nawrocki <snawrocki@...nel.org>,
        Sakari Ailus <sakari.ailus@....fi>
Subject: Re: [PATCH v10 4/4] [media] platform: Add Synopsys DesignWare HDMI RX
 Controller Driver

On Mon, Dec 11, 2017 at 6:41 PM, Jose Abreu <Jose.Abreu@...opsys.com> wrote:
> This is an initial submission for the Synopsys DesignWare HDMI RX
> Controller Driver. This driver interacts with a phy driver so that
> a communication between them is created and a video pipeline is
> configured.
>
> The controller + phy pipeline can then be integrated into a fully
> featured system that can be able to receive video up to 4k@...z
> with deep color 48bit RGB, depending on the platform. Although,
> this initial version does not yet handle deep color modes.
>
> This driver was implemented as a standard V4L2 subdevice and its
> main features are:
>         - Internal state machine that reconfigures phy until the
>         video is not stable
>         - JTAG communication with phy
>         - Inter-module communication with phy driver
>         - Debug write/read ioctls
>
> Some notes:
>         - RX sense controller (cable connection/disconnection) must
>         be handled by the platform wrapper as this is not integrated
>         into the controller RTL
>         - The same goes for EDID ROM's
>         - ZCAL calibration is needed only in FPGA platforms, in ASIC
>         this is not needed
>         - The state machine is not an ideal solution as it creates a
>         kthread but it is needed because some sources might not be
>         very stable at sending the video (i.e. we must react
>         accordingly).
>
> Signed-off-by: Jose Abreu <joabreu@...opsys.com>
> Cc: Joao Pinto <jpinto@...opsys.com>
> Cc: Mauro Carvalho Chehab <mchehab@...nel.org>
> Cc: Hans Verkuil <hans.verkuil@...co.com>
> Cc: Sylwester Nawrocki <snawrocki@...nel.org>
> Cc: Sakari Ailus <sakari.ailus@....fi>
> Cc: Philippe Ombredanne <pombredanne@...b.com>
> ---
> Changes from v9:
>         - Use SPDX License ID (Philippe)

Acked-by: Philippe Ombredanne <pombredanne@...b.com>