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authorUlrich Hecht <ulrich.hecht+renesas@gmail.com>2015-11-10 11:39:00 -0200
committerMauro Carvalho Chehab <mchehab@osg.samsung.com>2015-11-17 14:56:59 -0200
commit16dfe72fd879abc98255bbea62fae9d312ef3b5a (patch)
treeb2b367981692068090d6767e1f00f6718154e952 /drivers/media/i2c
parent588afcc1c0e45358159090d95bf7b246fb67565f (diff)
[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>
Diffstat (limited to 'drivers/media/i2c')
-rw-r--r--drivers/media/i2c/adv7180.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/media/i2c/adv7180.c b/drivers/media/i2c/adv7180.c
index f82c8aa164fa..3c3c4bfe3866 100644
--- a/drivers/media/i2c/adv7180.c
+++ b/drivers/media/i2c/adv7180.c
@@ -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)

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