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@xxxxxxxxx> Acked-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx> Acked-by: Lars-Peter Clausen <lars@xxxxxxxxxx> --- drivers/media/i2c/adv7180.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/media/i2c/adv7180.c b/drivers/media/i2c/adv7180.c index f82c8aa..3c3c4bf 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) -- 2.6.4
