linux-kernel - Re: [PATCH v8 2/4] media: i2c: imx334: add missing reset values for mode 3840x2160

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Message-ID: <20230106095219.ar6zqwyu7u5dusq6@uno.localdomain>
Date:   Fri, 6 Jan 2023 10:52:19 +0100
From:   Jacopo Mondi <jacopo.mondi@...asonboard.com>
To:     shravan kumar <shravan.chippa@...rochip.com>
Cc:     paul.j.murphy@...el.com, daniele.alessandrelli@...el.com,
        mchehab@...nel.org, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 2/4] media: i2c: imx334: add missing reset values for
 mode 3840x2160_regs[]

Hi Shravan

On Fri, Jan 06, 2023 at 12:59:29PM +0530, shravan kumar wrote:
> From: Shravan Chippa <shravan.chippa@...rochip.com>
>
> There are some missing reset reg_mode values for the 3840x2160@60
> resolution. The camera sensor still works in 3840x2160@60 resolution mode
> because of the register reset values. This is an issue when we change the
> modes dynamically. As an example, when we change the mode from 1920x1080@30
>  resolution to 3840x2160@60 resoultion then the mode values will be written
 ^ rogue space

> to the registers from the array mode_3840x2160_regs[] which gives the wrong
> output which is incorrect resolution.
>
> So add the missing reset values to the mode_3840x2160_regs[].
>

Are you resetting the registers to their default values, or are they
actually tuned for 3840x2160 operations ?

> Signed-off-by: Shravan Chippa <shravan.chippa@...rochip.com>
> ---
>  drivers/media/i2c/imx334.c | 20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
>
> diff --git a/drivers/media/i2c/imx334.c b/drivers/media/i2c/imx334.c
> index ebacba3059b3..a4549d194cae 100644
> --- a/drivers/media/i2c/imx334.c
> +++ b/drivers/media/i2c/imx334.c
> @@ -166,6 +166,7 @@ static const struct imx334_reg mode_3840x2160_regs[] = {
>  	{0x3288, 0x21},
>  	{0x328a, 0x02},
>  	{0x302c, 0x3c},
> +	{0x302d, 0x00},
>  	{0x302e, 0x00},
>  	{0x302f, 0x0f},
>  	{0x3076, 0x70},
> @@ -240,7 +241,26 @@ static const struct imx334_reg mode_3840x2160_regs[] = {
>  	{0x3794, 0x7a},
>  	{0x3796, 0xa1},
>  	{0x3e04, 0x0e},
> +	{0x319e, 0x00},
>  	{0x3a00, 0x01},
> +	{0x3A18, 0xBF},
> +	{0x3A19, 0x00},
> +	{0x3A1A, 0x67},
> +	{0x3A1B, 0x00},
> +	{0x3A1C, 0x6F},
> +	{0x3A1D, 0x00},
> +	{0x3A1E, 0xD7},
> +	{0x3A1F, 0x01},
> +	{0x3A20, 0x6F},
> +	{0x3A21, 0x00},
> +	{0x3A22, 0xCF},
> +	{0x3A23, 0x00},
> +	{0x3A24, 0x6F},
> +	{0x3A25, 0x00},
> +	{0x3A26, 0xB7},
> +	{0x3A27, 0x00},
> +	{0x3A28, 0x5F},
> +	{0x3A29, 0x00},

Nit: this is a small bunch of registers, and all the rest of the table
uses lowercase. Please do the same for sake of consistency.

Thanks
  j


>  };
>
>  /* Supported sensor mode configurations */
> --
> 2.34.1
>