diff mbox series

[v5,08/15] media: i2c: rdacm21: Add delay after OV490 reset

Message ID 20210616124616.49249-9-jacopo+renesas@jmondi.org (mailing list archive)
State New, archived
Headers show
Series media: gmsl: Reliability improvements | expand

Commit Message

Jacopo Mondi June 16, 2021, 12:46 p.m. UTC 
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@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
---
 drivers/media/i2c/rdacm21.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)
diff mbox series

Patch

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)