linux-kernel - Re: [PATCH] [media] imx: csi: retain current field order and colorimetry setting as default

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Message-ID: <20170406151032.GH17774@n2100.armlinux.org.uk>
Date:   Thu, 6 Apr 2017 16:10:33 +0100
From:   Russell King - ARM Linux <linux@...linux.org.uk>
To:     Philipp Zabel <p.zabel@...gutronix.de>
Cc:     Steve Longerbeam <slongerbeam@...il.com>, robh+dt@...nel.org,
        mark.rutland@....com, shawnguo@...nel.org, kernel@...gutronix.de,
        fabio.estevam@....com, mchehab@...nel.org, hverkuil@...all.nl,
        nick@...anahar.org, markus.heiser@...marIT.de,
        laurent.pinchart+renesas@...asonboard.com, bparrot@...com,
        geert@...ux-m68k.org, arnd@...db.de, sudipm.mukherjee@...il.com,
        minghsiu.tsai@...iatek.com, tiffany.lin@...iatek.com,
        jean-christophe.trotin@...com, horms+renesas@...ge.net.au,
        niklas.soderlund+renesas@...natech.se, robert.jarzmik@...e.fr,
        songjun.wu@...rochip.com, andrew-ct.chen@...iatek.com,
        gregkh@...uxfoundation.org, shuah@...nel.org,
        sakari.ailus@...ux.intel.com, pavel@....cz,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org,
        devel@...verdev.osuosl.org,
        Steve Longerbeam <steve_longerbeam@...tor.com>
Subject: Re: [PATCH] [media] imx: csi: retain current field order and
 colorimetry setting as default

On Thu, Apr 06, 2017 at 05:01:52PM +0200, Philipp Zabel wrote:
> On Thu, 2017-04-06 at 15:05 +0100, Russell King - ARM Linux wrote:
> > On Thu, Apr 06, 2017 at 03:55:29PM +0200, Philipp Zabel wrote:
> > > +
> > > +	/* Retain current field setting as default */
> > > +	if (sdformat->format.field == V4L2_FIELD_ANY)
> > > +		sdformat->format.field = fmt->field;
> > > +
> > > +	/* Retain current colorspace setting as default */
> > > +	if (sdformat->format.colorspace == V4L2_COLORSPACE_DEFAULT) {
> > > +		sdformat->format.colorspace = fmt->colorspace;
> > > +		if (sdformat->format.xfer_func == V4L2_XFER_FUNC_DEFAULT)
> > > +			sdformat->format.xfer_func = fmt->xfer_func;
> > > +		if (sdformat->format.ycbcr_enc == V4L2_YCBCR_ENC_DEFAULT)
> > > +			sdformat->format.ycbcr_enc = fmt->ycbcr_enc;
> > > +		if (sdformat->format.quantization == V4L2_QUANTIZATION_DEFAULT)
> > > +			sdformat->format.quantization = fmt->quantization;
> > > +	} else {
> > > +		if (sdformat->format.xfer_func == V4L2_XFER_FUNC_DEFAULT) {
> > > +			sdformat->format.xfer_func =
> > > +				V4L2_MAP_XFER_FUNC_DEFAULT(
> > > +						sdformat->format.colorspace);
> > > +		}
> > > +		if (sdformat->format.ycbcr_enc == V4L2_YCBCR_ENC_DEFAULT) {
> > > +			sdformat->format.ycbcr_enc =
> > > +				V4L2_MAP_YCBCR_ENC_DEFAULT(
> > > +						sdformat->format.colorspace);
> > > +		}
> > > +		if (sdformat->format.quantization == V4L2_QUANTIZATION_DEFAULT) {
> > > +			sdformat->format.quantization =
> > > +				V4L2_MAP_QUANTIZATION_DEFAULT(
> > > +						cc->cs != IPUV3_COLORSPACE_YUV,
> > > +						sdformat->format.colorspace,
> > > +						sdformat->format.ycbcr_enc);
> > > +		}
> > > +	}
> > 
> > Would it make sense for this to be a helper function?
> 
> Quite possible, the next subdev that has to set frame_interval on both
> pads manually because its upstream source pad doesn't suport
> frame_interval might want to do the same.

Hmm.  I'm not sure I agree with this approach.  If a subdev hardware
does not support any modification of the colourspace or field, then
it should not be modifyable at the source pad - it should retain the
propagated settings from the sink pad.

I thought I had already sent a patch doing exactly that.

-- 
RMK's Patch system: http://www.armlinux.org.uk/developer/patches/
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