Subject: [PATCH] media: atmel-isi: increase the burst length to improve the performance

From: [email-masked] (Josh Wu)
Date: Mon, 2 Feb 2015 18:15:46 +0800

Hi, Guennadi

Ping? what about the status of this patch?

Best Regards,
Josh Wu

On 11/25/2014 5:30 PM, Josh Wu wrote:
> The burst length could be BEATS_4/8/16. Before this patch, isi use default
> value BEATS_4. To imporve the performance we could set it to BEATS_16.
>
> Otherwise sometime it would cause the ISI overflow error.
>
> Reported-by: Bo Shen <[email-masked]>
> Signed-off-by: Josh Wu <[email-masked]>
> ---
>   drivers/media/platform/soc_camera/atmel-isi.c | 2 ++
>   include/media/atmel-isi.h                     | 4 ++++
>   2 files changed, 6 insertions(+)
>
> diff --git a/drivers/media/platform/soc_camera/atmel-isi.c b/drivers/media/platform/soc_camera/atmel-isi.c
> index ee5650f..fda587b 100644
> --- a/drivers/media/platform/soc_camera/atmel-isi.c
> +++ b/drivers/media/platform/soc_camera/atmel-isi.c
> @@ -839,6 +839,8 @@ static int isi_camera_set_bus_param(struct soc_camera_device *icd)
>   	if (isi->pdata.full_mode)
>   		cfg1 |= ISI_CFG1_FULL_MODE;
>   
> +	cfg1 |= ISI_CFG1_THMASK_BEATS_16;
> +
>   	isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
>   	isi_writel(isi, ISI_CFG1, cfg1);
>   
> diff --git a/include/media/atmel-isi.h b/include/media/atmel-isi.h
> index c2e5703..6008b09 100644
> --- a/include/media/atmel-isi.h
> +++ b/include/media/atmel-isi.h
> @@ -59,6 +59,10 @@
>   #define		ISI_CFG1_FRATE_DIV_MASK		(7 << 8)
>   #define ISI_CFG1_DISCR				(1 << 11)
>   #define ISI_CFG1_FULL_MODE			(1 << 12)
> +/* Definition for THMASK(ISI_V2) */
> +#define		ISI_CFG1_THMASK_BEATS_4		(0 << 13)
> +#define		ISI_CFG1_THMASK_BEATS_8		(1 << 13)
> +#define		ISI_CFG1_THMASK_BEATS_16	(2 << 13)
>   
>   /* Bitfields in CFG2 */
>   #define ISI_CFG2_GRAYSCALE			(1 << 13)