linux-kernel - Re: [PATCH 4/5] ispccdc: Configure CCDC_SYN_MODE register for UYVY8_2X8 and YUYV8

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Date:	Wed, 21 Sep 2011 01:26:19 +0200
From:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:	Deepthy Ravi <deepthy.ravi@...com>
Cc:	mchehab@...radead.org, tony@...mide.com, hvaibhav@...com,
	linux-media@...r.kernel.org, linux@....linux.org.uk,
	linux-arm-kernel@...ts.infradead.org, kyungmin.park@...sung.com,
	hverkuil@...all.nl, m.szyprowski@...sung.com,
	g.liakhovetski@....de, santosh.shilimkar@...com,
	khilman@...prootsystems.com, david.woodhouse@...el.com,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-omap@...r.kernel.org,
	Sakari Ailus <sakari.ailus@...well.research.nokia.com>
Subject: Re: [PATCH 4/5] ispccdc: Configure CCDC_SYN_MODE register for UYVY8_2X8 and YUYV8_2X8 formats

Hi Deepthy,

Thanks for the patch.

On Tuesday 20 September 2011 16:56:51 Deepthy Ravi wrote:
> Configure INPMOD and PACK8 fileds of CCDC_SYN_MODE
> register for UYVY8_2X8 and YUYV8_2X8 formats.
> 
> Signed-off-by: Deepthy Ravi <deepthy.ravi@...com>
> ---
>  drivers/media/video/omap3isp/ispccdc.c |   11 ++++++++---
>  1 files changed, 8 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/media/video/omap3isp/ispccdc.c
> b/drivers/media/video/omap3isp/ispccdc.c index 418ba65..1dcf180 100644
> --- a/drivers/media/video/omap3isp/ispccdc.c
> +++ b/drivers/media/video/omap3isp/ispccdc.c
> @@ -985,8 +985,12 @@ static void ccdc_config_sync_if(struct isp_ccdc_device
> *ccdc,
> 
>  	syn_mode &= ~ISPCCDC_SYN_MODE_INPMOD_MASK;
>  	if (format->code == V4L2_MBUS_FMT_YUYV8_2X8 ||
> -	    format->code == V4L2_MBUS_FMT_UYVY8_2X8)
> -		syn_mode |= ISPCCDC_SYN_MODE_INPMOD_YCBCR8;
> +	    format->code == V4L2_MBUS_FMT_UYVY8_2X8){
> +		if (pdata && pdata->bt656)
> +			syn_mode |= ISPCCDC_SYN_MODE_INPMOD_YCBCR8;
> +		else
> +			syn_mode |= ISPCCDC_SYN_MODE_INPMOD_YCBCR16;
> +	}
>  	else if (format->code == V4L2_MBUS_FMT_YUYV8_1X16 ||
>  		 format->code == V4L2_MBUS_FMT_UYVY8_1X16)
>  		syn_mode |= ISPCCDC_SYN_MODE_INPMOD_YCBCR16;
> @@ -1172,7 +1176,8 @@ static void ccdc_configure(struct isp_ccdc_device
> *ccdc) syn_mode &= ~ISPCCDC_SYN_MODE_SDR2RSZ;
> 
>  	/* Use PACK8 mode for 1byte per pixel formats. */
> -	if (omap3isp_video_format_info(format->code)->width <= 8)
> +	if ((omap3isp_video_format_info(format->code)->width <= 8) &&
> +			(omap3isp_video_format_info(format->code)->bpp <= 8))

I'm not sure to follow you. This will clear the PACK8 bit for the YUYV8_2X8 
formats. Those formats are 8 bits wide, shouldn't PACK8 be set to store 
samples on 8 bits instead of 16 bits ?

Is this patch intended to support YUYV8_2X8 sensors in non BT.656 mode with 
the bridge enabled ? In that case, what would you think about setting the CCDC 
input format to YUYV8_1X16 instead ? This would better reflect the reality, as 
the bridge converts YUYV8_2X8 to YUYV8_1X16, and the CCDC is then fed with 
YUYV8_1X16.

>  		syn_mode |= ISPCCDC_SYN_MODE_PACK8;
>  	else
>  		syn_mode &= ~ISPCCDC_SYN_MODE_PACK8;

-- 
Regards,

Laurent Pinchart
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