linux-kernel - Re: [PATCH 1/2] media: davinci: vpif: capture: add V4L2-async support

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Date:	Thu, 27 Jun 2013 11:43:40 +0530
From:	Prabhakar Lad <prabhakar.csengg@...il.com>
To:	Hans Verkuil <hverkuil@...all.nl>
Cc:	DLOS <davinci-linux-open-source@...ux.davincidsp.com>,
	Mauro Carvalho Chehab <mchehab@...hat.com>,
	LMML <linux-media@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Hans Verkuil <hans.verkuil@...co.com>,
	Guennadi Liakhovetski <g.liakhovetski@....de>,
	Sakari Ailus <sakari.ailus@....fi>
Subject: Re: [PATCH 1/2] media: davinci: vpif: capture: add V4L2-async support

Hi Hans,

Thanks for the review.

On Thu, Jun 27, 2013 at 11:27 AM, Hans Verkuil <hverkuil@...all.nl> wrote:
> On Tue June 25 2013 17:17:34 Prabhakar Lad wrote:
>> From: "Lad, Prabhakar" <prabhakar.csengg@...il.com>
>>
>> Add support for asynchronous subdevice probing, using the v4l2-async API.
>> The legacy synchronous mode is still supported too, which allows to
>> gradually update drivers and platforms.
>>
>> Signed-off-by: Prabhakar Lad <prabhakar.csengg@...il.com>
>> Cc: Guennadi Liakhovetski <g.liakhovetski@....de>
>> Cc: Hans Verkuil <hans.verkuil@...co.com>
>> Cc: Laurent Pinchart <laurent.pinchart@...asonboard.com>
>> Cc: Sakari Ailus <sakari.ailus@....fi>
>> Cc: Mauro Carvalho Chehab <mchehab@...hat.com>
>> ---
>>  drivers/media/platform/davinci/vpif_capture.c |  151 +++++++++++++++++--------
>>  drivers/media/platform/davinci/vpif_capture.h |    2 +
>>  include/media/davinci/vpif_types.h            |    2 +
>>  3 files changed, 107 insertions(+), 48 deletions(-)
>>
>> diff --git a/drivers/media/platform/davinci/vpif_capture.c b/drivers/media/platform/davinci/vpif_capture.c
>> index 5514175..b11d7a7 100644
>> --- a/drivers/media/platform/davinci/vpif_capture.c
>> +++ b/drivers/media/platform/davinci/vpif_capture.c
>> @@ -1979,6 +1979,76 @@ vpif_init_free_channel_objects:
>>       return err;
>>  }
>>
>> +static int vpif_async_bound(struct v4l2_async_notifier *notifier,
>> +                         struct v4l2_subdev *subdev,
>> +                         struct v4l2_async_subdev *asd)
>> +{
>> +     int i;
>> +
>> +     for (i = 0; i < vpif_obj.config->subdev_count; i++)
>> +             if (!strcmp(vpif_obj.config->subdev_info[i].name,
>> +                         subdev->name)) {
>
> Since the subdev name is now prefixed with the i2c bus identifier instead of
> just the chip name, does this code still work? Shouldn't it be 'strstr' instead
> of strcmp? Ditto for vpif_display and possibly others where the same
> mechanism might be used.
>
This is because the DA850-EVM has two tvp514x devices and assigning
the tvp514x device to appropriate channel is important, In this case strstr()
wont work so I used strcmp instead to match it appropriately.

Yes the code still works tested on DA850-EVM, with this patch [1].

[1] http://git.linuxtv.org/mhadli/v4l-dvb-davinci_devices.git/commitdiff/c906a89762541361158cf73e9494fa2f1ff8ba02

Regards,
--Prabhakar Lad
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