diff options
| author | Jacek Anaszewski | 2016-01-18 17:10:27 +0100 |
|---|---|---|
| committer | Mauro Carvalho Chehab | 2016-01-25 13:30:12 +0100 |
| commit | a13ddcae4f0bc5e1de761895d0cae2010e1934af (patch) | |
| tree | 402a16ece75cbdb6151322ced5fd17131652fd59 /drivers/media/platform/exynos4-is/fimc-is.c | |
| parent | [media] exynos4-is: Open shouldn't fail when sensor entity is not linked (diff) | |
| download | kernel-qcow2-linux-a13ddcae4f0bc5e1de761895d0cae2010e1934af.tar.gz kernel-qcow2-linux-a13ddcae4f0bc5e1de761895d0cae2010e1934af.tar.xz kernel-qcow2-linux-a13ddcae4f0bc5e1de761895d0cae2010e1934af.zip | |
[media] exynos4-is: Wait for 100us before opening sensor
Some user space use cases result in kernel hangup on the HIC_OPEN_SENSOR
command write. In case when a minimalistic application is used for setting
up the streaming, the hangups occur only occasionally. In case of GStreamer
use cases it is always the case.
Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
Acked-by: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Diffstat (limited to 'drivers/media/platform/exynos4-is/fimc-is.c')
| -rw-r--r-- | drivers/media/platform/exynos4-is/fimc-is.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/media/platform/exynos4-is/fimc-is.c b/drivers/media/platform/exynos4-is/fimc-is.c index 49658ca39e51..979c388ebf60 100644 --- a/drivers/media/platform/exynos4-is/fimc-is.c +++ b/drivers/media/platform/exynos4-is/fimc-is.c @@ -631,6 +631,12 @@ static int fimc_is_hw_open_sensor(struct fimc_is *is, fimc_is_mem_barrier(); + /* + * Some user space use cases hang up here without this + * empirically chosen delay. + */ + udelay(100); + mcuctl_write(HIC_OPEN_SENSOR, is, MCUCTL_REG_ISSR(0)); mcuctl_write(is->sensor_index, is, MCUCTL_REG_ISSR(1)); mcuctl_write(sensor->drvdata->id, is, MCUCTL_REG_ISSR(2)); |