linux-kernel - Re: [PATCH v2 1/5] media: i2c: imx335: Drop setting of 0x3a00 register

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Message-ID: <170669477439.1011926.18210850208916698098@ping.linuxembedded.co.uk>
Date: Wed, 31 Jan 2024 09:52:54 +0000
From: Kieran Bingham <kieran.bingham@...asonboard.com>
To: Umang Jain <umang.jain@...asonboard.com>, linux-media@...r.kernel.org
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>, open list <linux-kernel@...r.kernel.org>, Sakari Ailus <sakari.ailus@...ux.intel.com>, Umang Jain <umang.jain@...asonboard.com>, Matthias Fend <matthias.fend@...end.at>,
Subject: Re: [PATCH v2 1/5] media: i2c: imx335: Drop setting of 0x3a00 register

Hi Umang,

+ Cc: Matthias

Quoting Umang Jain (2024-01-31 05:52:04)
> Register 0x3a00 is a reserved field as per the IMX335 datasheet,
> hence shouldn't be set by the driver.

We still need to explain more about why we're dropping this register
write, and what effects it causes.

Matthias - I believe this stemmed from the work you did, and I think I
recall that you stated this register write broke the CSI2 configuration?

Can you clarify anything here for us please?

--
Kieran


> 
> Signed-off-by: Umang Jain <umang.jain@...asonboard.com>
> ---
>  drivers/media/i2c/imx335.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/drivers/media/i2c/imx335.c b/drivers/media/i2c/imx335.c
> index 7a37eb327ff4..927b4806a5d7 100644
> --- a/drivers/media/i2c/imx335.c
> +++ b/drivers/media/i2c/imx335.c
> @@ -249,7 +249,6 @@ static const struct imx335_reg mode_2592x1940_regs[] = {
>         {0x3794, 0x7a},
>         {0x3796, 0xa1},
>         {0x37b0, 0x36},
> -       {0x3a00, 0x01},
>  };
>  
>  static const struct imx335_reg raw10_framefmt_regs[] = {
> -- 
> 2.41.0
>