Date:	Wed, 29 Aug 2012 20:21:15 +0530
From:	Prabhakar Lad <prabhakar.csengg@...il.com>
To:	Sakari Ailus <sakari.ailus@....fi>
Cc:	Prabhakar Lad <prabhakar.lad@...com>,
	dlos <davinci-linux-open-source@...ux.davincidsp.com>,
	linux-kernel@...r.kernel.org,
	Mauro Carvalho Chehab <mchehab@...radead.org>,
	Hans de Goede <hdegoede@...hat.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Hans Verkuil <hans.verkuil@...co.com>,
	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	LMML <linux-media@...r.kernel.org>
Subject: Re: [PATCH] media: v4l2-ctrls: add control for dpcm predictor

Hi Sakari,

Thanks for the review.

On Wed, Aug 29, 2012 at 7:51 PM, Sakari Ailus <sakari.ailus@....fi> wrote:
> Hi Prabhakar,
>
> Thanks for the patch.
>
> On Wed, Aug 29, 2012 at 06:01:07PM +0530, Prabhakar Lad wrote:
>> From: Lad, Prabhakar <prabhakar.lad@...com>
>>
>> add V4L2_CID_DPCM_PREDICTOR control of type menu, which
>> determines the dpcm predictor. The predictor can be either
>> simple or advanced.
>>
>> Signed-off-by: Lad, Prabhakar <prabhakar.lad@...com>
>> Signed-off-by: Manjunath Hadli <manjunath.hadli@...com>
>> Cc: Sakari Ailus <sakari.ailus@....fi>
>> Cc: Hans Verkuil <hans.verkuil@...co.com>
>> Cc: Laurent Pinchart <laurent.pinchart@...asonboard.com>
>> Cc: Mauro Carvalho Chehab <mchehab@...radead.org>
>> Cc: Sylwester Nawrocki <s.nawrocki@...sung.com>
>> Cc: Hans de Goede <hdegoede@...hat.com>
>> Cc: Kyungmin Park <kyungmin.park@...sung.com>
>> ---
>>  This patches has one checkpatch warning for line over
>>  80 characters altough it can be avoided I have kept it
>>  for consistency.
>>
>>  drivers/media/v4l2-core/v4l2-ctrls.c |    9 +++++++++
>>  include/linux/videodev2.h            |    5 +++++
>>  2 files changed, 14 insertions(+), 0 deletions(-)
>>
>> diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
>> index b6a2ee7..2d7bc15 100644
>> --- a/drivers/media/v4l2-core/v4l2-ctrls.c
>> +++ b/drivers/media/v4l2-core/v4l2-ctrls.c
>> @@ -425,6 +425,11 @@ const char * const *v4l2_ctrl_get_menu(u32 id)
>>               "Gray",
>>               NULL,
>>       };
>> +     static const char * const dpcm_predictor[] = {
>> +             "Simple Predictor",
>> +             "Advanced Predictor",
>> +             NULL,
>> +     };
>>
>>       switch (id) {
>>       case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
>> @@ -502,6 +507,8 @@ const char * const *v4l2_ctrl_get_menu(u32 id)
>>               return mpeg4_profile;
>>       case V4L2_CID_JPEG_CHROMA_SUBSAMPLING:
>>               return jpeg_chroma_subsampling;
>> +     case V4L2_CID_DPCM_PREDICTOR:
>> +             return dpcm_predictor;
>>
>>       default:
>>               return NULL;
>> @@ -732,6 +739,7 @@ const char *v4l2_ctrl_get_name(u32 id)
>>       case V4L2_CID_IMAGE_PROC_CLASS:         return "Image Processing Controls";
>>       case V4L2_CID_LINK_FREQ:                return "Link Frequency";
>>       case V4L2_CID_PIXEL_RATE:               return "Pixel Rate";
>> +     case V4L2_CID_DPCM_PREDICTOR:           return "DPCM Predictor";
>>
>>       default:
>>               return NULL;
>> @@ -832,6 +840,7 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
>>       case V4L2_CID_ISO_SENSITIVITY_AUTO:
>>       case V4L2_CID_EXPOSURE_METERING:
>>       case V4L2_CID_SCENE_MODE:
>> +     case V4L2_CID_DPCM_PREDICTOR:
>>               *type = V4L2_CTRL_TYPE_MENU;
>>               break;
>>       case V4L2_CID_LINK_FREQ:
>> diff --git a/include/linux/videodev2.h b/include/linux/videodev2.h
>> index 6d6dfa7..4edb941 100644
>> --- a/include/linux/videodev2.h
>> +++ b/include/linux/videodev2.h
>> @@ -2000,6 +2000,11 @@ enum v4l2_jpeg_chroma_subsampling {
>>
>>  #define V4L2_CID_LINK_FREQ                   (V4L2_CID_IMAGE_PROC_CLASS_BASE + 1)
>>  #define V4L2_CID_PIXEL_RATE                  (V4L2_CID_IMAGE_PROC_CLASS_BASE + 2)
>> +#define V4L2_CID_DPCM_PREDICTOR                      (V4L2_CID_IMAGE_PROC_CLASS_BASE + 3)
>> +enum v4l2_dpcm_predictor {
>> +     V4L2_DPCM_PREDICTOR_SIMPLE      = 0,
>> +     V4L2_DPCM_PREDICTOR_ADVANCE     = 1,
>> +};
>
> s/ADVANCE/ADVANCED/ perhaps?
>
Ok I'll make it ADVANCED.

> To add to Sylwester's comment on the documentation, I think this control
> belongs to the image processing controls class.
>
I have added it as part of image processing control class itself
(#define V4L2_CID_DPCM_PREDICTOR  (V4L2_CID_IMAGE_PROC_CLASS_BASE + 3)),
 I'll include the same in documentation as well.

Thanks and Regards,
--Prabhakar Lad

> Kind regards,
>
> --
> Sakari Ailus
> e-mail: sakari.ailus@....fi     XMPP: sailus@...iisi.org.uk
> _______________________________________________
> Davinci-linux-open-source mailing list
> Davinci-linux-open-source@...ux.davincidsp.com
> http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
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