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

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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@atmel.com>
Signed-off-by: Josh Wu <josh.wu@atmel.com>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Josh Wu 2014-11-25 06:30:25 -03:00 committed by Mauro Carvalho Chehab
parent 0e66100637
commit ce037f19aa
2 changed files with 6 additions and 0 deletions
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2
drivers/media/platform/soc_camera/atmel-isi.c
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@ -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);

4
include/media/atmel-isi.h
View File

@ -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)