linux-kernel - [PATCH 4.19 208/280] media: i2c: ov5640: Fix post-reset delay

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Message-Id: <20190322111332.206053257@linuxfoundation.org>
Date:   Fri, 22 Mar 2019 12:16:01 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Loic Poulain <loic.poulain@...aro.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Adam Ford <aford173@...il.com>
Subject: [PATCH 4.19 208/280] media: i2c: ov5640: Fix post-reset delay

4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Loic Poulain <loic.poulain@...aro.org>

commit 1d4c41f3d887bcd66e82cb2fda124533dad8808a upstream.

According to the ov5640 specification (2.7 power up sequence), host can
access the sensor's registers 20ms after reset. Trying to access them
before leads to undefined behavior and result in sporadic initialization
errors.

Signed-off-by: Loic Poulain <loic.poulain@...aro.org>
Signed-off-by: Sakari Ailus <sakari.ailus@...ux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
Cc: Adam Ford <aford173@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/media/i2c/ov5640.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/media/i2c/ov5640.c
+++ b/drivers/media/i2c/ov5640.c
@@ -1759,7 +1759,7 @@ static void ov5640_reset(struct ov5640_d
 	usleep_range(1000, 2000);
 
 	gpiod_set_value_cansleep(sensor->reset_gpio, 0);
-	usleep_range(5000, 10000);
+	usleep_range(20000, 25000);
 }
 
 static int ov5640_set_power_on(struct ov5640_dev *sensor)