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Date:   Mon, 12 Apr 2021 11:43:12 +0200
From:   Jacopo Mondi <jacopo@jmondi.org>
To:     Eugen Hristev <eugen.hristev@microchip.com>
Cc:     devicetree@vger.kernel.org, linux-media@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 04/30] media: atmel: atmel-isc: specialize max width
 and max height
Message-ID: <20210412094312.tsghnyhglxf3roiy@uno.localdomain>
References: <20210405155105.162529-1-eugen.hristev@microchip.com>
 <20210405155105.162529-5-eugen.hristev@microchip.com>
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In-Reply-To: <20210405155105.162529-5-eugen.hristev@microchip.com>
Precedence: bulk

Hi Eugene,

On Mon, Apr 05, 2021 at 06:50:39PM +0300, Eugen Hristev wrote:
> Move the max width and max height constants to the product specific driver
> and have them in the device struct.
>
> Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
> ---
>  drivers/media/platform/atmel/atmel-isc-base.c | 28 +++++++++----------
>  drivers/media/platform/atmel/atmel-isc.h      |  9 ++++--
>  .../media/platform/atmel/atmel-sama5d2-isc.c  |  7 +++--
>  3 files changed, 25 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/media/platform/atmel/atmel-isc-base.c b/drivers/media/platform/atmel/atmel-isc-base.c
> index 45fc8dbb7943..350076dd029a 100644
> --- a/drivers/media/platform/atmel/atmel-isc-base.c
> +++ b/drivers/media/platform/atmel/atmel-isc-base.c
> @@ -1204,8 +1204,8 @@ static void isc_try_fse(struct isc_device *isc,
>  	 * just use the maximum ISC can receive.
>  	 */
>  	if (ret) {
> -		pad_cfg->try_crop.width = ISC_MAX_SUPPORT_WIDTH;
> -		pad_cfg->try_crop.height = ISC_MAX_SUPPORT_HEIGHT;
> +		pad_cfg->try_crop.width = isc->max_width;
> +		pad_cfg->try_crop.height = isc->max_height;
>  	} else {
>  		pad_cfg->try_crop.width = fse.max_width;
>  		pad_cfg->try_crop.height = fse.max_height;
> @@ -1282,10 +1282,10 @@ static int isc_try_fmt(struct isc_device *isc, struct v4l2_format *f,
>  	isc->try_config.sd_format = sd_fmt;
>
>  	/* Limit to Atmel ISC hardware capabilities */
> -	if (pixfmt->width > ISC_MAX_SUPPORT_WIDTH)
> -		pixfmt->width = ISC_MAX_SUPPORT_WIDTH;
> -	if (pixfmt->height > ISC_MAX_SUPPORT_HEIGHT)
> -		pixfmt->height = ISC_MAX_SUPPORT_HEIGHT;
> +	if (pixfmt->width > isc->max_width)
> +		pixfmt->width = isc->max_width;
> +	if (pixfmt->height > isc->max_height)
> +		pixfmt->height = isc->max_height;
>
>  	/*
>  	 * The mbus format is the one the subdev outputs.
> @@ -1327,10 +1327,10 @@ static int isc_try_fmt(struct isc_device *isc, struct v4l2_format *f,
>  	v4l2_fill_pix_format(pixfmt, &format.format);
>
>  	/* Limit to Atmel ISC hardware capabilities */
> -	if (pixfmt->width > ISC_MAX_SUPPORT_WIDTH)
> -		pixfmt->width = ISC_MAX_SUPPORT_WIDTH;
> -	if (pixfmt->height > ISC_MAX_SUPPORT_HEIGHT)
> -		pixfmt->height = ISC_MAX_SUPPORT_HEIGHT;
> +	if (pixfmt->width > isc->max_width)
> +		pixfmt->width = isc->max_width;
> +	if (pixfmt->height > isc->max_height)
> +		pixfmt->height = isc->max_height;

What happens if the sensor sends a frame larger that the ISC max
supported sizes ?

>
>  	pixfmt->field = V4L2_FIELD_NONE;
>  	pixfmt->bytesperline = (pixfmt->width * isc->try_config.bpp) >> 3;
> @@ -1368,10 +1368,10 @@ static int isc_set_fmt(struct isc_device *isc, struct v4l2_format *f)
>  		return ret;
>
>  	/* Limit to Atmel ISC hardware capabilities */
> -	if (pixfmt->width > ISC_MAX_SUPPORT_WIDTH)
> -		pixfmt->width = ISC_MAX_SUPPORT_WIDTH;
> -	if (pixfmt->height > ISC_MAX_SUPPORT_HEIGHT)
> -		pixfmt->height = ISC_MAX_SUPPORT_HEIGHT;
> +	if (f->fmt.pix.width > isc->max_width)
> +		f->fmt.pix.width = isc->max_width;
> +	if (f->fmt.pix.height > isc->max_height)
> +		f->fmt.pix.height = isc->max_height;
>
>  	isc->fmt = *f;
>
> diff --git a/drivers/media/platform/atmel/atmel-isc.h b/drivers/media/platform/atmel/atmel-isc.h
> index 8d81d9967ad2..6becc6c3aaf0 100644
> --- a/drivers/media/platform/atmel/atmel-isc.h
> +++ b/drivers/media/platform/atmel/atmel-isc.h
> @@ -10,9 +10,6 @@
>   */
>  #ifndef _ATMEL_ISC_H_
>
> -#define ISC_MAX_SUPPORT_WIDTH   2592
> -#define ISC_MAX_SUPPORT_HEIGHT  1944
> -
>  #define ISC_CLK_MAX_DIV		255
>
>  enum isc_clk_id {
> @@ -191,6 +188,9 @@ struct isc_ctrls {
>   * @gamma_table:	pointer to the table with gamma values, has
>   *			gamma_max sets of GAMMA_ENTRIES entries each
>   * @gamma_max:		maximum number of sets of inside the gamma_table
> + *
> + * @max_width:		maximum frame width, dependent on the internal RAM
> + * @max_height:		maximum frame height, dependent on the internal RAM
>   */
>  struct isc_device {
>  	struct regmap		*regmap;
> @@ -254,6 +254,9 @@ struct isc_device {
>  	/* pointer to the defined gamma table */
>  	const u32	(*gamma_table)[GAMMA_ENTRIES];
>  	u32		gamma_max;
> +
> +	u32		max_width;
> +	u32		max_height;
>  };
>
>  extern struct isc_format formats_list[];
> diff --git a/drivers/media/platform/atmel/atmel-sama5d2-isc.c b/drivers/media/platform/atmel/atmel-sama5d2-isc.c
> index f45d8b96bfb8..f8d1c8ba99b3 100644
> --- a/drivers/media/platform/atmel/atmel-sama5d2-isc.c
> +++ b/drivers/media/platform/atmel/atmel-sama5d2-isc.c
> @@ -49,8 +49,8 @@
>  #include "atmel-isc-regs.h"
>  #include "atmel-isc.h"
>
> -#define ISC_MAX_SUPPORT_WIDTH   2592
> -#define ISC_MAX_SUPPORT_HEIGHT  1944
> +#define ISC_SAMA5D2_MAX_SUPPORT_WIDTH   2592
> +#define ISC_SAMA5D2_MAX_SUPPORT_HEIGHT  1944
>
>  #define ISC_CLK_MAX_DIV		255
>
> @@ -195,6 +195,9 @@ static int atmel_isc_probe(struct platform_device *pdev)
>  	isc->gamma_table = isc_sama5d2_gamma_table;
>  	isc->gamma_max = 2;
>
> +	isc->max_width = ISC_SAMA5D2_MAX_SUPPORT_WIDTH;
> +	isc->max_height = ISC_SAMA5D2_MAX_SUPPORT_HEIGHT;
> +
>  	ret = isc_pipeline_init(isc);
>  	if (ret)
>  		return ret;
> --
> 2.25.1
>