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Subject[PATCH 4.18 073/228] media: ov772x: allow i2c controllers without I2C_FUNC_PROTOCOL_MANGLING
Date
4.18-stable review patch.  If anyone has any objections, please let me know.

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

From: Akinobu Mita <akinobu.mita@gmail.com>

[ Upstream commit 0b964d183cbf3f95a062ad9f3eec87ffa2790558 ]

The ov772x driver only works when the i2c controller have
I2C_FUNC_PROTOCOL_MANGLING. However, many i2c controller drivers don't
support it.

The reason that the ov772x requires I2C_FUNC_PROTOCOL_MANGLING is that
it doesn't support repeated starts.

This changes the reading ov772x register method so that it doesn't
require I2C_FUNC_PROTOCOL_MANGLING by calling two separated i2c messages.

Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Hans Verkuil <hans.verkuil@cisco.com>
Cc: Wolfram Sang <wsa@the-dreams.de>
Reviewed-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/media/i2c/ov772x.c | 20 ++++++++++++++------
1 file changed, 14 insertions(+), 6 deletions(-)

--- a/drivers/media/i2c/ov772x.c
+++ b/drivers/media/i2c/ov772x.c
@@ -542,9 +542,19 @@ static struct ov772x_priv *to_ov772x(str
return container_of(sd, struct ov772x_priv, subdev);
}

-static inline int ov772x_read(struct i2c_client *client, u8 addr)
+static int ov772x_read(struct i2c_client *client, u8 addr)
{
- return i2c_smbus_read_byte_data(client, addr);
+ int ret;
+ u8 val;
+
+ ret = i2c_master_send(client, &addr, 1);
+ if (ret < 0)
+ return ret;
+ ret = i2c_master_recv(client, &val, 1);
+ if (ret < 0)
+ return ret;
+
+ return val;
}

static inline int ov772x_write(struct i2c_client *client, u8 addr, u8 value)
@@ -1263,13 +1273,11 @@ static int ov772x_probe(struct i2c_clien
return -EINVAL;
}

- if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
- I2C_FUNC_PROTOCOL_MANGLING)) {
+ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
dev_err(&adapter->dev,
- "I2C-Adapter doesn't support SMBUS_BYTE_DATA or PROTOCOL_MANGLING\n");
+ "I2C-Adapter doesn't support SMBUS_BYTE_DATA\n");
return -EIO;
}
- client->flags |= I2C_CLIENT_SCCB;

priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)

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