linux-kernel - Re: [PATCH v5 12/15] media: i2c: rdacm20: Embed 'serializer' field

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Date:   Thu, 17 Jun 2021 08:18:42 +0200
From:   Hans Verkuil <hverkuil-cisco@...all.nl>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Jacopo Mondi <jacopo+renesas@...ndi.org>
Cc:     kieran.bingham+renesas@...asonboard.com,
        niklas.soderlund+renesas@...natech.se, geert@...ux-m68k.org,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 12/15] media: i2c: rdacm20: Embed 'serializer' field

On 17/06/2021 02:14, Laurent Pinchart wrote:
> Hi Jacopo,
> 
> Thank you for the patch.
> 
> This should be moved before 11/15 to avoid a bisection breakage (or
> 11/15 should be fixed, and this patch updated accordingly).

Good catch!

Jacopo, I dropped the PR I made. It you just want to swap patch 11 and 12,
then I can do that, if you want more extensive changes, then I need a v6.

Let me know what you want.

	Hans

> 
> On Wed, Jun 16, 2021 at 02:46:13PM +0200, Jacopo Mondi wrote:
>> There's no reason to allocate dynamically the 'serializer' field in
>> the driver structure.
>>
>> Embed the field and adjust all its users in the driver.
>>
>> Signed-off-by: Jacopo Mondi <jacopo+renesas@...ndi.org>
>> Reviewed-by: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
>> Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
>> ---
>>  drivers/media/i2c/rdacm20.c | 36 +++++++++++++++---------------------
>>  1 file changed, 15 insertions(+), 21 deletions(-)
>>
>> diff --git a/drivers/media/i2c/rdacm20.c b/drivers/media/i2c/rdacm20.c
>> index 5e0314a2b1ca..029af8fd7485 100644
>> --- a/drivers/media/i2c/rdacm20.c
>> +++ b/drivers/media/i2c/rdacm20.c
>> @@ -312,7 +312,7 @@ static const struct ov10635_reg {
>>  
>>  struct rdacm20_device {
>>  	struct device			*dev;
>> -	struct max9271_device		*serializer;
>> +	struct max9271_device		serializer;
>>  	struct i2c_client		*sensor;
>>  	struct v4l2_subdev		sd;
>>  	struct media_pad		pad;
>> @@ -399,7 +399,7 @@ static int rdacm20_s_stream(struct v4l2_subdev *sd, int enable)
>>  {
>>  	struct rdacm20_device *dev = sd_to_rdacm20(sd);
>>  
>> -	return max9271_set_serial_link(dev->serializer, enable);
>> +	return max9271_set_serial_link(&dev->serializer, enable);
>>  }
>>  
>>  static int rdacm20_enum_mbus_code(struct v4l2_subdev *sd,
>> @@ -455,10 +455,10 @@ static int rdacm20_initialize(struct rdacm20_device *dev)
>>  	unsigned int retry = 3;
>>  	int ret;
>>  
>> -	max9271_wake_up(dev->serializer);
>> +	max9271_wake_up(&dev->serializer);
>>  
>>  	/* Serial link disabled during config as it needs a valid pixel clock. */
>> -	ret = max9271_set_serial_link(dev->serializer, false);
>> +	ret = max9271_set_serial_link(&dev->serializer, false);
>>  	if (ret)
>>  		return ret;
>>  
>> @@ -466,35 +466,35 @@ static int rdacm20_initialize(struct rdacm20_device *dev)
>>  	 *  Ensure that we have a good link configuration before attempting to
>>  	 *  identify the device.
>>  	 */
>> -	max9271_configure_i2c(dev->serializer, MAX9271_I2CSLVSH_469NS_234NS |
>> -					       MAX9271_I2CSLVTO_1024US |
>> -					       MAX9271_I2CMSTBT_105KBPS);
>> +	max9271_configure_i2c(&dev->serializer, MAX9271_I2CSLVSH_469NS_234NS |
>> +						MAX9271_I2CSLVTO_1024US |
>> +						MAX9271_I2CMSTBT_105KBPS);
>>  
>> -	max9271_configure_gmsl_link(dev->serializer);
>> +	max9271_configure_gmsl_link(&dev->serializer);
>>  
>> -	ret = max9271_verify_id(dev->serializer);
>> +	ret = max9271_verify_id(&dev->serializer);
>>  	if (ret < 0)
>>  		return ret;
>>  
>> -	ret = max9271_set_address(dev->serializer, dev->addrs[0]);
>> +	ret = max9271_set_address(&dev->serializer, dev->addrs[0]);
>>  	if (ret < 0)
>>  		return ret;
>> -	dev->serializer->client->addr = dev->addrs[0];
>> +	dev->serializer.client->addr = dev->addrs[0];
>>  
>>  	/*
>>  	 * Reset the sensor by cycling the OV10635 reset signal connected to the
>>  	 * MAX9271 GPIO1 and verify communication with the OV10635.
>>  	 */
>> -	ret = max9271_enable_gpios(dev->serializer, MAX9271_GPIO1OUT);
>> +	ret = max9271_enable_gpios(&dev->serializer, MAX9271_GPIO1OUT);
>>  	if (ret)
>>  		return ret;
>>  
>> -	ret = max9271_clear_gpios(dev->serializer, MAX9271_GPIO1OUT);
>> +	ret = max9271_clear_gpios(&dev->serializer, MAX9271_GPIO1OUT);
>>  	if (ret)
>>  		return ret;
>>  	usleep_range(10000, 15000);
>>  
>> -	ret = max9271_set_gpios(dev->serializer, MAX9271_GPIO1OUT);
>> +	ret = max9271_set_gpios(&dev->serializer, MAX9271_GPIO1OUT);
>>  	if (ret)
>>  		return ret;
>>  	usleep_range(10000, 15000);
>> @@ -564,13 +564,7 @@ static int rdacm20_probe(struct i2c_client *client)
>>  	if (!dev)
>>  		return -ENOMEM;
>>  	dev->dev = &client->dev;
>> -
>> -	dev->serializer = devm_kzalloc(&client->dev, sizeof(*dev->serializer),
>> -				       GFP_KERNEL);
>> -	if (!dev->serializer)
>> -		return -ENOMEM;
>> -
>> -	dev->serializer->client = client;
>> +	dev->serializer.client = client;
>>  
>>  	ret = of_property_read_u32_array(client->dev.of_node, "reg",
>>  					 dev->addrs, 2);
>