linux-kernel - Re: [PATCH 40/40] media: imx: set and propagate empty field, colorimetry params

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Message-ID: <c2f14369-2aeb-d9bc-5b65-d15d39db8f47@gmail.com>
Date:   Mon, 8 May 2017 20:44:03 -0700
From:   Steve Longerbeam <slongerbeam@...il.com>
To:     Philipp Zabel <p.zabel@...gutronix.de>,
        Hans Verkuil <hverkuil@...all.nl>
Cc:     gregkh@...uxfoundation.org, mchehab@...nel.org,
        rmk+kernel@...linux.org.uk, linux-media@...r.kernel.org,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        Steve Longerbeam <steve_longerbeam@...tor.com>
Subject: Re: [PATCH 40/40] media: imx: set and propagate empty field,
 colorimetry params



On 05/08/2017 02:41 AM, Philipp Zabel wrote:
> Hi Steve,
>
> On Wed, 2017-04-12 at 17:45 -0700, Steve Longerbeam wrote:
>> This patch adds a call to imx_media_fill_empty_mbus_fields() in the
>> *_try_fmt() functions at the sink pads, to set empty field order and
>> colorimetry parameters.
>>
>> If the field order is set to ANY, choose the currently set field order
>> at the sink pad. If the colorspace is set to DEFAULT, choose the
>> current colorspace at the sink pad.  If any of xfer_func, ycbcr_enc
>> or quantization are set to DEFAULT, either choose the current sink pad
>> setting, or the default setting for the new colorspace, if non-DEFAULT
>> colorspace was given.
>>
>> Colorimetry is also propagated from sink to source pads anywhere
>> this has not already been done. The exception is ic-prpencvf at the
>> source pad, since the Image Converter outputs fixed quantization and
>> Y`CbCr encoding.
>>
>> Signed-off-by: Steve Longerbeam <steve_longerbeam@...tor.com>
>> ---
>>  drivers/staging/media/imx/imx-ic-prp.c      |  5 ++-
>>  drivers/staging/media/imx/imx-ic-prpencvf.c | 25 +++++++++++---
>>  drivers/staging/media/imx/imx-media-csi.c   | 12 +++++--
>>  drivers/staging/media/imx/imx-media-utils.c | 53 +++++++++++++++++++++++++++++
>>  drivers/staging/media/imx/imx-media-vdic.c  |  7 ++--
>>  drivers/staging/media/imx/imx-media.h       |  3 +-
>>  6 files changed, 95 insertions(+), 10 deletions(-)
>>
> [...]
>> diff --git a/drivers/staging/media/imx/imx-media-utils.c b/drivers/staging/media/imx/imx-media-utils.c
>> index 7b2f92d..b07d0ae 100644
>> --- a/drivers/staging/media/imx/imx-media-utils.c
>> +++ b/drivers/staging/media/imx/imx-media-utils.c
>> @@ -464,6 +464,59 @@ int imx_media_init_mbus_fmt(struct v4l2_mbus_framefmt *mbus,
>>  }
>>  EXPORT_SYMBOL_GPL(imx_media_init_mbus_fmt);
>>
>> +/*
>> + * Check whether the field or colorimetry params in tryfmt are
>> + * uninitialized, and if so fill them with the values from fmt.
>> + * The exception is when tryfmt->colorspace has been initialized,
>> + * if so all the further default colorimetry params can be derived
>> + * from tryfmt->colorspace.
>> + */
>> +void imx_media_fill_empty_mbus_fields(struct v4l2_mbus_framefmt *tryfmt,
>> +				      struct v4l2_mbus_framefmt *fmt)
>> +{
>> +	/* fill field if necessary */
>> +	if (tryfmt->field == V4L2_FIELD_ANY)
>> +		tryfmt->field = fmt->field;
>> +
>> +	/* fill colorimetry if necessary */
>> +	if (tryfmt->colorspace == V4L2_COLORSPACE_DEFAULT) {
>> +		tryfmt->colorspace = fmt->colorspace;
>> +		if (tryfmt->xfer_func == V4L2_XFER_FUNC_DEFAULT)
>> +			tryfmt->xfer_func = fmt->xfer_func;
>> +		if (tryfmt->ycbcr_enc == V4L2_YCBCR_ENC_DEFAULT)
>> +			tryfmt->ycbcr_enc = fmt->ycbcr_enc;
>> +		if (tryfmt->quantization == V4L2_QUANTIZATION_DEFAULT)
>> +			tryfmt->quantization = fmt->quantization;
>
> According to Hans' latest comments, this could be changed to:
>
> ----------8<----------
> From cca3cda9effcaca0891eb8044a79137023fed1c2 Mon Sep 17 00:00:00 2001
> From: Philipp Zabel <p.zabel@...gutronix.de>
> Date: Mon, 8 May 2017 11:38:05 +0200
> Subject: [PATCH] fixup! media: imx: set and propagate default field,
>  colorimetry
>
> Signed-off-by: Philipp Zabel <p.zabel@...gutronix.de>
> ---
>  drivers/staging/media/imx/imx-media-utils.c | 9 +++------
>  1 file changed, 3 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/staging/media/imx/imx-media-utils.c b/drivers/staging/media/imx/imx-media-utils.c
> index a8766489e8a18..ec2abd618cc44 100644
> --- a/drivers/staging/media/imx/imx-media-utils.c
> +++ b/drivers/staging/media/imx/imx-media-utils.c
> @@ -497,12 +497,9 @@ void imx_media_fill_default_mbus_fields(struct v4l2_mbus_framefmt *tryfmt,
>  	/* fill colorimetry if necessary */
>  	if (tryfmt->colorspace == V4L2_COLORSPACE_DEFAULT) {
>  		tryfmt->colorspace = fmt->colorspace;
> -		if (tryfmt->xfer_func == V4L2_XFER_FUNC_DEFAULT)
> -			tryfmt->xfer_func = fmt->xfer_func;
> -		if (tryfmt->ycbcr_enc == V4L2_YCBCR_ENC_DEFAULT)
> -			tryfmt->ycbcr_enc = fmt->ycbcr_enc;
> -		if (tryfmt->quantization == V4L2_QUANTIZATION_DEFAULT)
> -			tryfmt->quantization = fmt->quantization;
> +		tryfmt->xfer_func = fmt->xfer_func;
> +		tryfmt->ycbcr_enc = fmt->ycbcr_enc;
> +		tryfmt->quantization = fmt->quantization;
>  	} else {
>  		if (tryfmt->xfer_func == V4L2_XFER_FUNC_DEFAULT) {
>  			tryfmt->xfer_func =
>

Hi Philipp, makes sense to me, I'll make the change in next revision.

Steve