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

[Josh Wu]

Hi, Guennadi

On 2/2/2015 6:22 PM, Guennadi Liakhovetski wrote:
> Hi Josh,
>
> On Mon, 2 Feb 2015, Josh Wu wrote:
>
>> Hi, Guennadi
>>
>> Ping? what about the status of this patch?
> Right, got lost, sorry... Added to the queue now.
Thank you.

Best Regards,
Josh Wu

>
> Thanks
> Guennadi
>
>> 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 <voice.shen at atmel.com>
>>> Signed-off-by: Josh Wu <josh.wu at atmel.com>
>>> ---
>>>    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)