linux-kernel - Re: [PATCH v3 18/23] media: atmel: atmel-isc-base: add wb debug messages

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Message-ID: <20220112090003.nktnhm3oho4mdx6g@uno.localdomain>
Date:   Wed, 12 Jan 2022 10:00:03 +0100
From:   Jacopo Mondi <jacopo@...ndi.org>
To:     Eugen Hristev <eugen.hristev@...rochip.com>
Cc:     linux-media@...r.kernel.org, robh+dt@...nel.org,
        laurent.pinchart@...asonboard.com, sakari.ailus@....fi,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, nicolas.ferre@...rochip.com
Subject: Re: [PATCH v3 18/23] media: atmel: atmel-isc-base: add wb debug
 messages

Hello Eugen,

On Mon, Dec 13, 2021 at 03:49:35PM +0200, Eugen Hristev wrote:
> Add debug messages that make it easier to debug white balance algorithm.
>
> Signed-off-by: Eugen Hristev <eugen.hristev@...rochip.com>

The dev_dbg() infrastructure is preferred, as far as I know v4l2_dbg()
is legacy and should be removed.

However the driver uses v4l2_dbg() already, so
Reviewed-by: Jacopo Mondi <jacopo+renesas@...ndi.org>

Thanks
  j

> ---
>  drivers/media/platform/atmel/atmel-isc-base.c | 18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
>
> diff --git a/drivers/media/platform/atmel/atmel-isc-base.c b/drivers/media/platform/atmel/atmel-isc-base.c
> index 53cac1aac0fd..f1f1019f9d82 100644
> --- a/drivers/media/platform/atmel/atmel-isc-base.c
> +++ b/drivers/media/platform/atmel/atmel-isc-base.c
> @@ -1329,10 +1329,15 @@ static void isc_hist_count(struct isc_device *isc, u32 *min, u32 *max)
>
>  	if (!*min)
>  		*min = 1;
> +
> +	v4l2_dbg(1, debug, &isc->v4l2_dev,
> +		 "isc wb: hist_id %u, hist_count %u",
> +		 ctrls->hist_id, *hist_count);
>  }
>
>  static void isc_wb_update(struct isc_ctrls *ctrls)
>  {
> +	struct isc_device *isc = container_of(ctrls, struct isc_device, ctrls);
>  	u32 *hist_count = &ctrls->hist_count[0];
>  	u32 c, offset[4];
>  	u64 avg = 0;
> @@ -1349,6 +1354,9 @@ static void isc_wb_update(struct isc_ctrls *ctrls)
>  		(u64)hist_count[ISC_HIS_CFG_MODE_GB];
>  	avg >>= 1;
>
> +	v4l2_dbg(1, debug, &isc->v4l2_dev,
> +		 "isc wb: green components average %llu\n", avg);
> +
>  	/* Green histogram is null, nothing to do */
>  	if (!avg)
>  		return;
> @@ -1401,9 +1409,15 @@ static void isc_wb_update(struct isc_ctrls *ctrls)
>  		else
>  			gw_gain[c] = 1 << 9;
>
> +		v4l2_dbg(1, debug, &isc->v4l2_dev,
> +			 "isc wb: component %d, s_gain %u, gw_gain %u\n",
> +			 c, s_gain[c], gw_gain[c]);
>  		/* multiply both gains and adjust for decimals */
>  		ctrls->gain[c] = s_gain[c] * gw_gain[c];
>  		ctrls->gain[c] >>= 9;
> +		v4l2_dbg(1, debug, &isc->v4l2_dev,
> +			 "isc wb: component %d, final gain %u\n",
> +			 c, ctrls->gain[c]);
>  	}
>  }
>
> @@ -1423,6 +1437,10 @@ static void isc_awb_work(struct work_struct *w)
>  		return;
>
>  	isc_hist_count(isc, &min, &max);
> +
> +	v4l2_dbg(1, debug, &isc->v4l2_dev,
> +		 "isc wb mode %d: hist min %u , max %u\n", hist_id, min, max);
> +
>  	ctrls->hist_minmax[hist_id][HIST_MIN_INDEX] = min;
>  	ctrls->hist_minmax[hist_id][HIST_MAX_INDEX] = max;
>
> --
> 2.25.1
>