linux-kernel - Re: [PATCH 2/5] drm/stm: ltdc: add YCbCr 422 output support

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Message-ID: <71eb2c1d-e2d6-7c4a-e66d-3f43c296eac7@foss.st.com>
Date:   Thu, 13 Jan 2022 10:57:02 +0100
From:   Raphael Gallais-Pou <raphael.gallais-pou@...s.st.com>
To:     Yannick Fertre <yannick.fertre@...s.st.com>,
        Philippe Cornu <philippe.cornu@...s.st.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        <dri-devel@...ts.freedesktop.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/5] drm/stm: ltdc: add YCbCr 422 output support


On 12/15/21 10:47 PM, Yannick Fertre wrote:
> LTDC 40100 hw version supports the YCbCr 422 output,
> reducing the output pins from 24 to 16. This feature
> is useful for some external devices like HDMI bridges.
>
> Both ITU-R BT.601 & ITU-R BT.709 are supported.
>
> It is also possible to choose the chrominance order between
> * Cb is output first (Y0Cb, then Y1Cr, Y2Cb and so on).
> * Cr is output first (Y0Cr, then Y1Cb, Y2Cr and so on).
>
> Signed-off-by: Yannick Fertre <yannick.fertre@...s.st.com>
> ---
>  drivers/gpu/drm/stm/ltdc.c | 44 +++++++++++++++++++++++++++++++++++++-
>  drivers/gpu/drm/stm/ltdc.h |  1 +
>  2 files changed, 44 insertions(+), 1 deletion(-)


Hello Yannick,


Reviewed-by: Raphael Gallais-Pou <raphael.gallais-pou@...s.st.com>

Thanks,

Raphaël