The power_on function of the driver resets the chip and sets the
CHIP_CONTROL register to 0. This switches the operating mode to slave.
The s_stream function sets the correct mode. But this caused problems on
a board where the camera chip is operated as master. The camera started
after a random amount of time streaming an image, I observed between 10
and 300 seconds.
The STRFM_OUT and STLN_OUT pins are not connected on this board which
may cause some issues in slave mode. I could not find any documentation
about this.
Keeping the chip in master mode after the reset helped to fix this
issue for me.
Signed-off-by: Markus Pargmann <m...@pengutronix.de>
---
drivers/media/i2c/mt9v032.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/media/i2c/mt9v032.c b/drivers/media/i2c/mt9v032.c
index c1bc564a0979..cc16acf001de 100644
--- a/drivers/media/i2c/mt9v032.c
+++ b/drivers/media/i2c/mt9v032.c
@@ -349,7 +349,8 @@ static int mt9v032_power_on(struct mt9v032 *mt9v032)
if (ret < 0)
return ret;
- return regmap_write(map, MT9V032_CHIP_CONTROL, 0);
+ return regmap_write(map, MT9V032_CHIP_CONTROL,
+ MT9V032_CHIP_CONTROL_MASTER_MODE);
}
static void mt9v032_power_off(struct mt9v032 *mt9v032)
@@ -421,8 +422,7 @@ __mt9v032_get_pad_crop(struct mt9v032 *mt9v032, struct
v4l2_subdev_pad_config *c
static int mt9v032_s_stream(struct v4l2_subdev *subdev, int enable)
{
- const u16 mode = MT9V032_CHIP_CONTROL_MASTER_MODE
- | MT9V032_CHIP_CONTROL_DOUT_ENABLE
+ const u16 mode = MT9V032_CHIP_CONTROL_DOUT_ENABLE
| MT9V032_CHIP_CONTROL_SEQUENTIAL;
struct mt9v032 *mt9v032 = to_mt9v032(subdev);
struct v4l2_rect *crop = &mt9v032->crop;
--
2.6.2
--
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