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authorJosh Wu <josh.wu@atmel.com>2014-11-25 06:30:25 -0300
committerMauro Carvalho Chehab <mchehab@osg.samsung.com>2015-03-02 13:27:11 -0300
commitce037f19aaef992c634af653b17e61eee30a9404 (patch)
tree92eacbba08e01fa81f101dafebaa409ab2be871e
parent0e661006370b7e7fb9ac9d94f9c3500a62cd559b (diff)
[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>
-rw-r--r--drivers/media/platform/soc_camera/atmel-isi.c2
-rw-r--r--include/media/atmel-isi.h4
2 files changed, 6 insertions, 0 deletions
diff --git a/drivers/media/platform/soc_camera/atmel-isi.c b/drivers/media/platform/soc_camera/atmel-isi.c
index 8526bf5c8429..c835beb2a1a8 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 c2e570336269..6008b0985b7b 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)

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