linux-kernel - Re: [PATCH v4 10/10] media: subdev: Support non-routing subdevs in v4l2_subdev_s_stream

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Date: Tue, 16 Apr 2024 18:58:51 +0530
From: Umang Jain <umang.jain@...asonboard.com>
To: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
 Mauro Carvalho Chehab <mchehab@...nel.org>, Hans Verkuil
 <hverkuil@...all.nl>, Laurent Pinchart <laurent.pinchart@...asonboard.com>,
 Sakari Ailus <sakari.ailus@...ux.intel.com>
Subject: Re: [PATCH v4 10/10] media: subdev: Support non-routing subdevs in
 v4l2_subdev_s_stream_helper()

Hi Tomi

On 16/04/24 4:13 pm, Tomi Valkeinen wrote:
> Hi,
>
> On 16/04/2024 13:40, Tomi Valkeinen wrote:
>> At the moment v4l2_subdev_s_stream_helper() only works for subdevices
>> that support routing. As enable/disable_streams now also works for
>> subdevices without routing, improve v4l2_subdev_s_stream_helper() to do
>> the same.
>
> I forgot to mention, I have not tested this patch as I don't have a HW 
> setup. And, of course, I now see that it has a bug. The BIT_ULL(1) 
> should be BIT_ULL(0).
>
> Umang, can you try a fixed one on your side? If it works, I'll send a v5.

This doesn't work. Streaming fails as :

[  132.108845] rkisp1 32e10000.isp: streams 0xffff8000801fef88 already 
enabled on imx283 1-001a:0
[  133.140906] rkisp1 32e10000.isp: streams 0xffff8000801fef88 already 
enabled on imx283 1-001a:0

With locally applied:

diff --git a/drivers/media/v4l2-core/v4l2-subdev.c 
b/drivers/media/v4l2-core/v4l2-subdev.c
index 04d85b5f23f5..4684e4e1984c 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -2203,7 +2203,7 @@ int v4l2_subdev_enable_streams(struct v4l2_subdev 
*sd, u32 pad,
         }

         if (enabled_streams) {
-               dev_dbg(dev, "streams 0x%llx already enabled on %s:%u\n",
+               dev_err(dev, "streams 0x%llx already enabled on %s:%u\n",
                         enabled_streams, sd->entity.name, pad);
                 ret = -EINVAL;
                 goto done;
@@ -2376,7 +2376,7 @@ int v4l2_subdev_s_stream_helper(struct v4l2_subdev 
*sd, int enable)
                  * For non-streams subdevices, there's a single 
implicit stream
                  * per pad.
                  */
-               source_mask = BIT_ULL(1);
+               source_mask = BIT_ULL(0);
         }

>
>  Tomi
>
>> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
>> ---
>>   drivers/media/v4l2-core/v4l2-subdev.c | 23 ++++++++++++++++-------
>>   1 file changed, 16 insertions(+), 7 deletions(-)
>>
>> diff --git a/drivers/media/v4l2-core/v4l2-subdev.c 
>> b/drivers/media/v4l2-core/v4l2-subdev.c
>> index 1c6b305839a1..83ebcde54a34 100644
>> --- a/drivers/media/v4l2-core/v4l2-subdev.c
>> +++ b/drivers/media/v4l2-core/v4l2-subdev.c
>> @@ -2360,15 +2360,24 @@ int v4l2_subdev_s_stream_helper(struct 
>> v4l2_subdev *sd, int enable)
>>       if (WARN_ON(pad_index == -1))
>>           return -EINVAL;
>>   -    /*
>> -     * As there's a single source pad, just collect all the source 
>> streams.
>> -     */
>> -    state = v4l2_subdev_lock_and_get_active_state(sd);
>> +    if (sd->flags & V4L2_SUBDEV_FL_STREAMS) {
>> +        /*
>> +         * As there's a single source pad, just collect all the source
>> +         * streams.
>> +         */
>> +        state = v4l2_subdev_lock_and_get_active_state(sd);
>>   -    for_each_active_route(&state->routing, route)
>> -        source_mask |= BIT_ULL(route->source_stream);
>> +        for_each_active_route(&state->routing, route)
>> +            source_mask |= BIT_ULL(route->source_stream);
>>   -    v4l2_subdev_unlock_state(state);
>> +        v4l2_subdev_unlock_state(state);
>> +    } else {
>> +        /*
>> +         * For non-streams subdevices, there's a single implicit stream
>> +         * per pad.
>> +         */
>> +        source_mask = BIT_ULL(1);
>> +    }
>>         if (enable)
>>           return v4l2_subdev_enable_streams(sd, pad_index, source_mask);
>>
>