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[media] exynos4-is: Wait for 100us before opening sensor

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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 <[email protected]>
Acked-by: Kyungmin Park <[email protected]>
Cc: Sylwester Nawrocki <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>
This commit is contained in:
Jacek Anaszewski 2016-01-18 14:10:27 -02:00 • committed by Mauro Carvalho Chehab
commit a13ddcae4f
1 changed files with 6 additions and 0 deletions
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6
drivers/media/platform/exynos4-is/fimc-is.c
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@ -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));