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From: Dafna Hirschfeld <dafna.hirschfeld@collabora.com>
To: Jacopo Mondi <jacopo@jmondi.org>
Cc: mchehab@kernel.org, sakari.ailus@linux.intel.com,
	hverkuil@xs4all.nl, laurent.pinchart@ideasonboard.com,
	roman.kovalivskyi@globallogic.com,
	dave.stevenson@raspberrypi.org, naush@raspberrypi.com,
	mrodin@de.adit-jv.com, hugues.fruchet@st.com, mripard@kernel.org,
	aford173@gmail.com, sudipi@jp.adit-jv.com,
	andrew_gabbasov@mentor.com, erosca@de.adit-jv.com,
	linux-media@vger.kernel.org, libcamera-devel@lists.libcamera.org,
	dafna Hirschfeld <dafna3@gmail.com>
Subject: Re: [PATCH 20/25] media: ov5647: Program mode only if it has changed
Date: Tue, 30 Jun 2020 11:32:12 +0200
Message-ID: <e3dfbf68-f81b-3349-b3ad-dd9e5f6a0f5f@collabora.com> (raw)
In-Reply-To: <20200630074305.soctqoaqirfdnvv2@uno.localdomain>



On 30.06.20 09:43, Jacopo Mondi wrote:
> Hi Dafna,
> 
> On Mon, Jun 29, 2020 at 07:48:16PM +0200, Dafna Hirschfeld wrote:
>>
>>
>> On 23.06.20 18:55, Jacopo Mondi wrote:
>>> Store in the driver structure a pointer to the currently applied mode
>>> and program a new one at s_stream(1) time only if it has changed.
>>
>> Hi,
>> I think this can be more readably implemented with a 'is_streaming' boolean
>> field.
> 
> How would you like to use an 'is_streaming' flag to decide if the
> sensor mode has to be updated ?

since 'current_mode' is set to NULL upon `ov5647_stream_off`
and you return from 'ov5647_set_stream' immediately if 'mode == current_mode'
it seem very similar to returning immediately from 'ov5647_set_stream' if the
device is currently streaming.

But actually in this patch it seems to be possible to change the mode
while streaming, if the callbacks are executed:

s_stream(1)
s_fmt
s_stream(1)

which is maybe a bug?

Thanks,
Dafna

> 
> Thanks
>     j
> 
> 
>>
>> Thanks,
>> Dafna
>>
>>>
>>> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
>>> ---
>>>    drivers/media/i2c/ov5647.c | 16 +++++++++++++++-
>>>    1 file changed, 15 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/media/i2c/ov5647.c b/drivers/media/i2c/ov5647.c
>>> index 39e320f321bd8..ac114269e1c73 100644
>>> --- a/drivers/media/i2c/ov5647.c
>>> +++ b/drivers/media/i2c/ov5647.c
>>> @@ -96,6 +96,7 @@ struct ov5647 {
>>>    	bool				clock_ncont;
>>>    	struct v4l2_ctrl_handler	ctrls;
>>>    	struct ov5647_mode		*mode;
>>> +	struct ov5647_mode		*current_mode;
>>>    };
>>>    static inline struct ov5647 *to_sensor(struct v4l2_subdev *sd)
>>> @@ -750,9 +751,13 @@ static int ov5647_set_virtual_channel(struct v4l2_subdev *sd, int channel)
>>>    static int ov5647_set_mode(struct v4l2_subdev *sd)
>>>    {
>>>    	struct i2c_client *client = v4l2_get_subdevdata(sd);
>>> +	struct ov5647 *sensor = to_sensor(sd);
>>>    	u8 resetval, rdval;
>>>    	int ret;
>>> +	if (sensor->mode == sensor->current_mode)
>>> +		return 0;
>>> +
>>>    	ret = ov5647_read(sd, OV5647_SW_STANDBY, &rdval);
>>>    	if (ret < 0)
>>>    		return ret;
>>> @@ -778,6 +783,8 @@ static int ov5647_set_mode(struct v4l2_subdev *sd)
>>>    			return ret;
>>>    	}
>>> +	sensor->current_mode = sensor->mode;
>>> +
>>>    	return 0;
>>>    }
>>> @@ -816,6 +823,7 @@ static int ov5647_stream_on(struct v4l2_subdev *sd)
>>>    static int ov5647_stream_off(struct v4l2_subdev *sd)
>>>    {
>>> +	struct ov5647 *sensor = to_sensor(sd);
>>>    	int ret;
>>>    	ret = ov5647_write(sd, OV5647_REG_MIPI_CTRL00, MIPI_CTRL00_CLOCK_LANE_GATE |
>>> @@ -827,7 +835,13 @@ static int ov5647_stream_off(struct v4l2_subdev *sd)
>>>    	if (ret < 0)
>>>    		return ret;
>>> -	return ov5647_write(sd, OV5640_REG_PAD_OUT, 0x01);
>>> +	ret = ov5647_write(sd, OV5640_REG_PAD_OUT, 0x01);
>>> +	if (ret < 0)
>>> +		return ret;
>>> +
>>> +	sensor->current_mode = NULL;
>>> +
>>> +	return 0;
>>>    }
>>>    static int set_sw_standby(struct v4l2_subdev *sd, bool standby)
>>>

  reply index

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-23 10:07 [PATCH 00/25] media: ov5647: Support RaspberryPi Camera Module v1 Jacopo Mondi
2020-06-23 10:07 ` [PATCH 01/25] dt-bindings: media: ov5647: Document pwdn-gpios Jacopo Mondi
2020-06-23 10:07 ` [PATCH 02/25] dt-bindings: media: ov5647: Document clock-noncontinuous Jacopo Mondi
2020-06-23 10:07 ` [PATCH 03/25] media: ov5647: Add support for PWDN GPIO Jacopo Mondi
2020-07-09 20:04   ` [libcamera-devel] " Dafna Hirschfeld
2020-07-14 12:45     ` Jacopo Mondi
2020-06-23 10:07 ` [PATCH 04/25] media: ov5647: Add support for non-continuous clock mode Jacopo Mondi
2020-06-23 10:07 ` [PATCH 05/25] media: ov5647: Add set_fmt and get_fmt calls Jacopo Mondi
2020-06-23 10:07 ` [PATCH 06/25] media: ov5647: Fix format initialization Jacopo Mondi
2020-06-23 10:07 ` [PATCH 07/25] media: ov5647: Fix style issues Jacopo Mondi
2020-06-23 10:07 ` [PATCH 08/25] media: ov5647: Replace license with SPDX identifier Jacopo Mondi
2020-06-23 10:07 ` [PATCH 09/25] media: ov5647: Fix return value from read/write Jacopo Mondi
2020-06-23 10:08 ` [PATCH 10/25] media: ov5647: Program mode at s_stream(1) time Jacopo Mondi
2020-06-23 16:42 ` [PATCH 11/25] media: ov5647: Implement enum_frame_size() Jacopo Mondi
2020-08-18  7:33   ` Sakari Ailus
2020-08-18  7:38     ` Sakari Ailus
2020-06-23 16:42 ` [PATCH 12/25] media: ov5647: Protect s_stream() with mutex Jacopo Mondi
2020-06-23 16:42 ` [PATCH 13/25] media: ov5647: Support gain, exposure and AWB controls Jacopo Mondi
2020-06-23 16:42 ` [PATCH 14/25] media: ov5647: Rationalize driver structure name Jacopo Mondi
2020-06-23 16:42 ` [PATCH 15/25] media: ov5647: Break out format handling Jacopo Mondi
2020-07-31 11:44   ` Sakari Ailus
2020-06-23 16:49 ` [PATCH 16/25] media: ov5647: Add support for get_selection() Jacopo Mondi
2020-07-09 19:56   ` [libcamera-devel] " Dafna Hirschfeld
2020-06-23 16:49 ` [PATCH 17/25] media: ov5647: Rename SBGGR8 VGA mode Jacopo Mondi
2020-06-23 16:49 ` [PATCH 18/25] media: ov5647: Add SGGBR10_1X10 modes Jacopo Mondi
2020-06-23 16:49 ` [PATCH 19/25] media: ov5647: Implement set_fmt pad operation Jacopo Mondi
2020-06-29 16:54   ` [libcamera-devel] " Dafna Hirschfeld
2020-06-30 10:13     ` Jacopo Mondi
2020-06-30 11:09       ` Dafna Hirschfeld
2020-06-23 16:55 ` [PATCH 20/25] media: ov5647: Program mode only if it has changed Jacopo Mondi
2020-06-29 17:48   ` Dafna Hirschfeld
2020-06-30  7:43     ` Jacopo Mondi
2020-06-30  9:32       ` Dafna Hirschfeld [this message]
2020-06-30 10:06         ` Jacopo Mondi
2020-06-30 10:56           ` Dafna Hirschfeld
2020-06-30 12:05             ` Jacopo Mondi
2020-06-30 13:01               ` Dafna Hirschfeld
2020-06-30 14:53                 ` [libcamera-devel] " Dave Stevenson
2020-06-30 15:11                   ` Dafna Hirschfeld
2020-07-01  7:25                 ` Laurent Pinchart
2020-07-03 12:21                   ` Jacopo Mondi
2020-07-03 16:33                     ` Laurent Pinchart
2020-06-23 16:55 ` [PATCH 21/25] media: ov5647: Set V4L2_SUBDEV_FL_HAS_EVENTS flag Jacopo Mondi
2020-06-23 16:55 ` [PATCH 22/25] media: ov5647: Support V4L2_CID_PIXEL_RATE Jacopo Mondi
2020-06-29 17:01   ` [libcamera-devel] " Dafna Hirschfeld
2020-06-29 21:25     ` Dave Stevenson
2020-06-30 15:13       ` Dave Stevenson
2020-07-01  7:21         ` Laurent Pinchart
2020-06-23 16:55 ` [PATCH 23/25] media: ov5647: Support V4L2_CID_HBLANK control Jacopo Mondi
2020-06-23 16:55 ` [PATCH 24/25] media: ov5647: Support V4L2_CID_VBLANK control Jacopo Mondi
2020-06-23 16:55 ` [PATCH 25/25] media: ov5647: Advertise the correct exposure range Jacopo Mondi
2020-06-29 17:33 ` [PATCH 00/25] media: ov5647: Support RaspberryPi Camera Module v1 Dafna Hirschfeld
2020-06-29 18:08   ` Dafna Hirschfeld
2020-07-10 15:59 ` Dafna Hirschfeld
2020-07-14 12:48   ` Jacopo Mondi

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