From ce037f19aaef992c634af653b17e61eee30a9404 Mon Sep 17 00:00:00 2001 From: Josh Wu <josh.wu@atmel.com> Date: Tue, 25 Nov 2014 06:30:25 -0300 Subject: [PATCH] [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: 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> --- 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 8526bf5c8429a..c835beb2a1a8f 100644 --- a/drivers/media/platform/soc_camera/atmel-isi.c +++ b/drivers/media/platform/soc_camera/atmel-isi.c @@ -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); diff --git a/include/media/atmel-isi.h b/include/media/atmel-isi.h index c2e570336269b..6008b0985b7b1 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) -- 2.30.2