linux-kernel - Re: [PATCH 1/2] media: atmel-isi: setup the ISI

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Message-ID: <55BAE37F.6050705@atmel.com>
Date:	Fri, 31 Jul 2015 10:54:55 +0800
From:	Josh Wu <josh.wu@...el.com>
To:	Linux Media Mailing List <linux-media@...r.kernel.org>,
	"Guennadi Liakhovetski" <g.liakhovetski@....de>
CC:	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	"Mauro Carvalho Chehab" <mchehab@....samsung.com>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] media: atmel-isi: setup the ISI_CFG2 register directly

Hi, list

Ping..., any feedback for this series?

Best Regards,
Josh Wu

On 6/17/2015 6:39 PM, Josh Wu wrote:
> In the function configure_geometry(), we will setup the ISI CFG2
> according to the sensor output format.
>
> It make no sense to just read back the CFG2 register and just set part
> of it.
>
> So just set up this register directly makes things simpler.
> Currently only support YUV format from camera sensor.
>
> Signed-off-by: Josh Wu <josh.wu@...el.com>
> ---
>
>   drivers/media/platform/soc_camera/atmel-isi.c | 20 +++++++-------------
>   1 file changed, 7 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/media/platform/soc_camera/atmel-isi.c b/drivers/media/platform/soc_camera/atmel-isi.c
> index 9070172..8bc40ca 100644
> --- a/drivers/media/platform/soc_camera/atmel-isi.c
> +++ b/drivers/media/platform/soc_camera/atmel-isi.c
> @@ -105,24 +105,25 @@ static u32 isi_readl(struct atmel_isi *isi, u32 reg)
>   static int configure_geometry(struct atmel_isi *isi, u32 width,
>   			u32 height, u32 code)
>   {
> -	u32 cfg2, cr;
> +	u32 cfg2;
>   
> +	/* According to sensor's output format to set cfg2 */
>   	switch (code) {
>   	/* YUV, including grey */
>   	case MEDIA_BUS_FMT_Y8_1X8:
> -		cr = ISI_CFG2_GRAYSCALE;
> +		cfg2 = ISI_CFG2_GRAYSCALE;
>   		break;
>   	case MEDIA_BUS_FMT_VYUY8_2X8:
> -		cr = ISI_CFG2_YCC_SWAP_MODE_3;
> +		cfg2 = ISI_CFG2_YCC_SWAP_MODE_3;
>   		break;
>   	case MEDIA_BUS_FMT_UYVY8_2X8:
> -		cr = ISI_CFG2_YCC_SWAP_MODE_2;
> +		cfg2 = ISI_CFG2_YCC_SWAP_MODE_2;
>   		break;
>   	case MEDIA_BUS_FMT_YVYU8_2X8:
> -		cr = ISI_CFG2_YCC_SWAP_MODE_1;
> +		cfg2 = ISI_CFG2_YCC_SWAP_MODE_1;
>   		break;
>   	case MEDIA_BUS_FMT_YUYV8_2X8:
> -		cr = ISI_CFG2_YCC_SWAP_DEFAULT;
> +		cfg2 = ISI_CFG2_YCC_SWAP_DEFAULT;
>   		break;
>   	/* RGB, TODO */
>   	default:
> @@ -130,17 +131,10 @@ static int configure_geometry(struct atmel_isi *isi, u32 width,
>   	}
>   
>   	isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
> -
> -	cfg2 = isi_readl(isi, ISI_CFG2);
> -	/* Set YCC swap mode */
> -	cfg2 &= ~ISI_CFG2_YCC_SWAP_MODE_MASK;
> -	cfg2 |= cr;
>   	/* Set width */
> -	cfg2 &= ~(ISI_CFG2_IM_HSIZE_MASK);
>   	cfg2 |= ((width - 1) << ISI_CFG2_IM_HSIZE_OFFSET) &
>   			ISI_CFG2_IM_HSIZE_MASK;
>   	/* Set height */
> -	cfg2 &= ~(ISI_CFG2_IM_VSIZE_MASK);
>   	cfg2 |= ((height - 1) << ISI_CFG2_IM_VSIZE_OFFSET)
>   			& ISI_CFG2_IM_VSIZE_MASK;
>   	isi_writel(isi, ISI_CFG2, cfg2);

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