Add a delay after the OV490 chip is put in reset state. The reset signal shall be held low for at least 250 useconds. Signed-off-by: Jacopo Mondi <jacopo+renesas@xxxxxxxxxx> Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx> Reviewed-by: Kieran Bingham <kieran.bingham+renesas@xxxxxxxxxxxxxxxx> --- drivers/media/i2c/rdacm21.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/media/i2c/rdacm21.c b/drivers/media/i2c/rdacm21.c index 553e3f03752b..6be8ce130e78 100644 --- a/drivers/media/i2c/rdacm21.c +++ b/drivers/media/i2c/rdacm21.c @@ -469,7 +469,10 @@ static int rdacm21_initialize(struct rdacm21_device *dev) if (ret) return ret; - /* Enable GPIO1 and hold OV490 in reset during max9271 configuration. */ + /* + * Enable GPIO1 and hold OV490 in reset during max9271 configuration. + * The reset signal has to be asserted for at least 250 useconds. + */ ret = max9271_enable_gpios(&dev->serializer, MAX9271_GPIO1OUT); if (ret) return ret; @@ -477,6 +480,7 @@ static int rdacm21_initialize(struct rdacm21_device *dev) ret = max9271_clear_gpios(&dev->serializer, MAX9271_GPIO1OUT); if (ret) return ret; + usleep_range(250, 500); ret = max9271_configure_gmsl_link(&dev->serializer); if (ret) -- 2.31.1
