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[media] media: adv7180: increase delay after reset to 5ms 

Initialization of the ADV7180 chip fails on the Renesas R8A7790-based
Lager board about 50% of the time.  This patch resolves the issue by
increasing the minimum delay after reset from 2 ms to 5 ms, following the
recommendation in the ADV7180 datasheet:

"Executing a software reset takes approximately 2 ms. However, it is
recommended to wait 5 ms before any further I2C writes are performed."

Signed-off-by: Ulrich Hecht <ulrich.hecht+renesas@gmail.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
hifive-unleashed-5.1
Ulrich Hecht 2015-11-10 11:39:00 -02:00 committed by Mauro Carvalho Chehab
parent 588afcc1c0
commit 16dfe72fd8
1 changed files with 1 additions and 1 deletions
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2
drivers/media/i2c/adv7180.c
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@ -1112,7 +1112,7 @@ static int init_device(struct adv7180_state *state)
mutex_lock(&state->mutex);
adv7180_write(state, ADV7180_REG_PWR_MAN, ADV7180_PWR_MAN_RES);
usleep_range(2000, 10000);
usleep_range(5000, 10000);
ret = state->chip_info->init(state);
if (ret)