linux-kernel - Re: [PATCH 4/5] media: imx335: Fix active area height discrepency

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Message-ID: <170974471357.362031.9683522744235199514@ping.linuxembedded.co.uk>
Date: Wed, 06 Mar 2024 17:05:13 +0000
From: Kieran Bingham <kieran.bingham@...asonboard.com>
To: Umang Jain <umang.jain@...asonboard.com>, linux-media@...r.kernel.org
Cc: Alexander Shiyan <eagle.alexander923@...il.com>, Mauro Carvalho Chehab <mchehab@...nel.org>, Sakari Ailus <sakari.ailus@...ux.intel.com>, open list <linux-kernel@...r.kernel.org>, Umang Jain <umang.jain@...asonboard.com>
Subject: Re: [PATCH 4/5] media: imx335: Fix active area height discrepency

Quoting Umang Jain (2024-03-06 08:10:37)
> The imx335 reports a recommended pixel area of - 2592x1944.
> The driver supported mode however limits it to height=1940.

Hrm, I think I would convert widths and sizes to decimal as a patch
before this patch so the effect is clearer in this diff.

> Fix the height discrepency by correctly the value of height
> (with updates to vblank and mode registers).
> 
> Signed-off-by: Umang Jain <umang.jain@...asonboard.com>
> ---
>  drivers/media/i2c/imx335.c | 18 +++++++++---------
>  1 file changed, 9 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/media/i2c/imx335.c b/drivers/media/i2c/imx335.c
> index 6ea09933e47b..c00e0c2be3f3 100644
> --- a/drivers/media/i2c/imx335.c
> +++ b/drivers/media/i2c/imx335.c
> @@ -246,13 +246,13 @@ static const int imx335_tpg_val[] = {
>  };
>  
>  /* Sensor mode registers */
> -static const struct cci_reg_sequence mode_2592x1940_regs[] = {
> +static const struct cci_reg_sequence mode_2592x1944_regs[] = {
>         {IMX335_REG_MODE_SELECT, 0x01},
>         {IMX335_REG_MASTER_MODE, 0x00},
> -       {IMX335_REG_WINMODE, 0x04},
> -       {IMX335_REG_HTRIMMING_START, 0x0180},
> +       {IMX335_REG_WINMODE, 0x00},

What's the distinction of the winmode here. What is 0x04 vs 0x00?

Is this something that could be a defined value? Or is that not worth
the effort?

> +       {IMX335_REG_HTRIMMING_START, 0x30},

HTRIMMING_START has moved a lot more than I would expect there.
Is there a visual impact of any concern here?

>         {IMX335_REG_HNUM, 0x0a20},
> -       {IMX335_REG_Y_OUT_SIZE, 0x0794},
> +       {IMX335_REG_Y_OUT_SIZE, 0x0798},

This bit looks expected ;-)

>         {IMX335_REG_VCROP_POS, 0x00b0},
>         {IMX335_REG_VCROP_SIZE, 0x0f58},

0x0f58 = 3928. Does that correspond to anything on the pixel array size?
We're modifying the vertical size, so I'm curious if the 'vcrop' is or
should be impacted?

>         {IMX335_REG_OPB_SIZE_V, 0x00},
> @@ -403,14 +403,14 @@ static const u32 imx335_mbus_codes[] = {
>  /* Supported sensor mode configurations */
>  static const struct imx335_mode supported_mode = {
>         .width = 2592,
> -       .height = 1940,
> +       .height = 1944,
>         .hblank = 342,
> -       .vblank = 2560,
> -       .vblank_min = 2560,
> +       .vblank = 2556,
> +       .vblank_min = 2556,
>         .vblank_max = 133060,
>         .reg_list = {
> -               .num_of_regs = ARRAY_SIZE(mode_2592x1940_regs),
> -               .regs = mode_2592x1940_regs,
> +               .num_of_regs = ARRAY_SIZE(mode_2592x1944_regs),
> +               .regs = mode_2592x1944_regs,
>         },
>  };
>  
> -- 
> 2.43.0
>