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Commit a13ddcae authored by Jacek Anaszewski's avatar Jacek Anaszewski Committed by Mauro Carvalho Chehab
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[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: default avatarJacek Anaszewski <j.anaszewski@samsung.com>
Acked-by: default avatarKyungmin Park <kyungmin.park@samsung.com>
Cc: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@osg.samsung.com>
parent 76775776

drivers/media/platform/exynos4-is/fimc-is.c

+6 −0
Original line number Original line Diff line number Diff line
@@ -631,6 +631,12 @@ static int fimc_is_hw_open_sensor(struct fimc_is *is, 




	fimc_is_mem_barrier();

	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(HIC_OPEN_SENSOR, is, MCUCTL_REG_ISSR(0));

	mcuctl_write(is->sensor_index, is, MCUCTL_REG_ISSR(1));

	mcuctl_write(is->sensor_index, is, MCUCTL_REG_ISSR(1));

	mcuctl_write(sensor->drvdata->id, is, MCUCTL_REG_ISSR(2));

	mcuctl_write(sensor->drvdata->id, is, MCUCTL_REG_ISSR(2));