linux-kernel - Re: [PATCH] media: docs-rst: Clarify duration of LP-11 mode

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Message-ID: <3f31cde6-8faf-f9a0-626e-dc995260a640@gmail.com>
Date:   Mon, 12 Aug 2019 09:53:33 +0100
From:   Ian Arkver <ian.arkver.dev@...il.com>
To:     Steve Longerbeam <slongerbeam@...il.com>,
        linux-media@...r.kernel.org
Cc:     Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] media: docs-rst: Clarify duration of LP-11 mode

Hi Steve,

On 11/08/2019 18:36, Steve Longerbeam wrote:
> Add a sentence that makes it more clear when the CSI-2 transmitter
> must, if possible, exit LP-11 mode. That is, maintain LP-11 mode
> until stream on, at which point the transmitter activates the clock
> lane and transition to HS mode.
> 
> Signed-off-by: Steve Longerbeam <slongerbeam@...il.com>
> ---
>   Documentation/media/kapi/csi2.rst | 10 +++++++---
>   1 file changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/media/kapi/csi2.rst b/Documentation/media/kapi/csi2.rst
> index a7e75e2eba85..6cd1d4b0df17 100644
> --- a/Documentation/media/kapi/csi2.rst
> +++ b/Documentation/media/kapi/csi2.rst
> @@ -49,9 +49,13 @@ where
>   
>   The transmitter drivers must, if possible, configure the CSI-2
>   transmitter to *LP-11 mode* whenever the transmitter is powered on but
> -not active. Some transmitters do this automatically but some have to
> -be explicitly programmed to do so, and some are unable to do so
> -altogether due to hardware constraints.
> +not active, and maintain *LP-11 mode* until stream on. Only until

s/until/at/ perhaps?

Regards,
Ian
> +stream on should the transmitter activate the clock on the clock lane
> +and transition to *HS mode*.
> +
> +Some transmitters do this automatically but some have to be explicitly
> +programmed to do so, and some are unable to do so altogether due to
> +hardware constraints.
>   
>   Stopping the transmitter
>   ^^^^^^^^^^^^^^^^^^^^^^^^
>