linux-kernel - Re: [PATCH 12/16] media: i2c: max9286: Define high channel amplitude

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Message-ID: <732fca69-dddf-dd0b-af32-fcfb96e35dd1@ideasonboard.com>
Date:   Thu, 18 Feb 2021 15:39:54 +0000
From:   Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
To:     Jacopo Mondi <jacopo+renesas@...ndi.org>,
        laurent.pinchart+renesas@...asonboard.com,
        niklas.soderlund+renesas@...natech.se, geert@...ux-m68k.org
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 12/16] media: i2c: max9286: Define high channel amplitude

Hi Jacopo,

On 16/02/2021 17:41, Jacopo Mondi wrote:
> Provide a macro to define the reverse channel amplitude to
> be used to compensate the remote serializer noise immunity.
> 
> While at it, update a comment.

Reviewed-by: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>

> 
> Signed-off-by: Jacopo Mondi <jacopo+renesas@...ndi.org>
> ---
>  drivers/media/i2c/max9286.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c
> index 4afb5ca06448..7913b5f2249e 100644
> --- a/drivers/media/i2c/max9286.c
> +++ b/drivers/media/i2c/max9286.c
> @@ -113,6 +113,7 @@
>  #define MAX9286_REV_TRF(n)		((n) << 4)
>  #define MAX9286_REV_AMP(n)		((((n) - 30) / 10) << 1) /* in mV */
>  #define MAX9286_REV_AMP_X		BIT(0)
> +#define MAX9286_REV_AMP_HIGH		170
>  /* Register 0x3f */
>  #define MAX9286_EN_REV_CFG		BIT(6)
>  #define MAX9286_REV_FLEN(n)		((n) - 20)
> @@ -566,12 +567,12 @@ static int max9286_notify_bound(struct v4l2_async_notifier *notifier,
>  	 * channels:
>  	 *
>  	 * - Increase the reverse channel amplitude to compensate for the
> -	 *   remote ends high threshold, if not done already
> +	 *   remote ends high threshold
>  	 * - Verify all configuration links are properly detected
>  	 * - Disable auto-ack as communication on the control channel are now
>  	 *   stable.
>  	 */
> -	max9286_reverse_channel_setup(priv, 170);
> +	max9286_reverse_channel_setup(priv, MAX9286_REV_AMP_HIGH);
>  	max9286_check_config_link(priv, priv->source_mask);
>  
>  	/*
>