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Commit ce037f19 authored by Josh Wu's avatar Josh Wu Committed by Mauro Carvalho Chehab
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[media] media: atmel-isi: increase the burst length to improve the performance 



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: default avatarBo Shen <voice.shen@atmel.com>
Signed-off-by: default avatarJosh Wu <josh.wu@atmel.com>
Signed-off-by: default avatarGuennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@osg.samsung.com>
parent 0e661006

drivers/media/platform/soc_camera/atmel-isi.c

+2 −0
Original line number Diff line number Diff line
@@ -843,6 +843,8 @@ 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);

include/media/atmel-isi.h

+4 −0
Original line number Diff line number Diff line
@@ -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)