[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>

diff --git a/drivers/media/platform/soc_camera/atmel-isi.c b/drivers/media/platform/soc_camera/atmel-isi.c
index 8526bf5c8429aecbb5afa8030fca537b0720b2ab..c835beb2a1a8f30e14f48a34566b842dbdce96cf 100644 (file)
--- 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 c2e570336269b8e2e3c574c607afc651d8f1a6eb..6008b0985b7b18a5e15c157a487ccfb6b640b312 100644 (file)
--- 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)