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Message-Id: <20210319164148.199192-12-jacopo+renesas@jmondi.org>
Date: Fri, 19 Mar 2021 17:41:40 +0100
From: Jacopo Mondi <jacopo+renesas@...ndi.org>
To: kieran.bingham+renesas@...asonboard.com,
laurent.pinchart+renesas@...asonboard.com,
niklas.soderlund+renesas@...natech.se, geert@...ux-m68k.org
Cc: Jacopo Mondi <jacopo+renesas@...ndi.org>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
linux-media@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH v3 11/19] media: i2c: rdacm21: Add dealy after OV490 reset
Add a delay after the OV490 chip is put in reset state. The reset
signal shall be held for at least 250 useconds.
Signed-off-by: Jacopo Mondi <jacopo+renesas@...ndi.org>
---
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 babd14b21252..875bec9f7904 100644
--- a/drivers/media/i2c/rdacm21.c
+++ b/drivers/media/i2c/rdacm21.c
@@ -448,7 +448,10 @@ static int rdacm21_init(struct v4l2_subdev *sd, unsigned int val)
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;
@@ -456,6 +459,7 @@ static int rdacm21_init(struct v4l2_subdev *sd, unsigned int val)
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)
--
2.30.0
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