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Date:   Tue, 27 Nov 2018 09:58:33 +0100
From:   Maxime Ripard <maxime.ripard@bootlin.com>
To:     Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Cc:     linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
        linux-arm-kernel@lists.infradead.org,
        Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
        Sean Paul <sean@poorly.run>, David Airlie <airlied@linux.ie>,
        Chen-Yu Tsai <wens@csie.org>,
        Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
        linux-sunxi@googlegroups.com, Daniel Vetter <daniel@ffwll.ch>
Subject: Re: [PATCH v2 25/43] drm/sun4i: frontend: Apply format sub-sampling
 to CH1 dimensions
Message-ID: <20181127085833.b6jhe5npgsvl2g5f@flea>
References: <20181123092515.2511-1-paul.kocialkowski@bootlin.com>
 <20181123092515.2511-26-paul.kocialkowski@bootlin.com>
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On Fri, Nov 23, 2018 at 10:24:57AM +0100, Paul Kocialkowski wrote:
> The frontend comes with two "channels", that can be configured
> independently. When used in YUV mode, the first channel (CH0) represents
> the luminance component while the second channel (CH1) represents the
> chrominance. In RGB mode, both have to be configured the same way.
>=20
> Use variables (with the YUV terminology) for each channel's
> dimensions, calculating the chroma dimensions from the luma dimensions
> and the sub-sampling factors from the format description.
>=20
> Since the configured size only has pixel precision, the fractional
> fixed-point part of the source size is dropped for both components to
> ensure that the scaling factors are accurate.
>=20
> Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>

Applied, thanks!
Maxime

--=20
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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