linux-kernel - Re: [PATCH v17 5/6] drm/bridge: dw-hdmi: add YCBCR formats only if CSC is available

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Message-ID: <9d3f8bfb-74f7-cbd9-a6f5-1e8acae4c13b@baylibre.com>
Date:   Thu, 7 Apr 2022 10:29:16 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     "H. Nikolaus Schaller" <hns@...delico.com>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Robert Foss <robert.foss@...aro.org>,
        Paul Boddie <paul@...die.org.uk>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Paul Cercueil <paul@...pouillou.net>,
        Maxime Ripard <maxime@...no.tech>,
        Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
Cc:     letux-kernel@...nphoenux.org, linux-mips@...r.kernel.org,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        Jonas Karlman <jonas@...boo.se>
Subject: Re: [PATCH v17 5/6] drm/bridge: dw-hdmi: add YCBCR formats only if
 CSC is available

On 06/04/2022 18:26, H. Nikolaus Schaller wrote:
> otherwise they will produce a black HDMI screen.
> 
> Signed-off-by: H. Nikolaus Schaller <hns@...delico.com>
> ---
>   drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 6 ++++--
>   1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> index b5a665c5e406e..ec40dd8865065 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> @@ -2628,10 +2628,12 @@ static u32 *dw_hdmi_bridge_atomic_get_output_bus_fmts(struct drm_bridge *bridge,
>   		output_fmts[i++] = MEDIA_BUS_FMT_RGB101010_1X30;
>   	}
>   
> -	if (hdmi->sink_is_hdmi && info->color_formats & DRM_COLOR_FORMAT_YCBCR422)
> +	if (hdmi->csc_available && hdmi->sink_is_hdmi &&
> +	    (info->color_formats & DRM_COLOR_FORMAT_YCBCR422))
>   		output_fmts[i++] = MEDIA_BUS_FMT_UYVY8_1X16;
>   
> -	if (hdmi->sink_is_hdmi && info->color_formats & DRM_COLOR_FORMAT_YCBCR444)
> +	if (hdmi->csc_available && hdmi->sink_is_hdmi &&
> +	    (info->color_formats & DRM_COLOR_FORMAT_YCBCR444))
>   		output_fmts[i++] = MEDIA_BUS_FMT_YUV8_1X24;
>   
>   	/* Default 8bit RGB fallback */

This patch shouldn't be needed anymore with proper filtering in patch 1.

Neil