linux-kernel - Re: [PATCH v3 02/10] drm/bridge: dw-hdmi: add max bpc connector property

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Message-ID: <20191218154942.GG4863@pendragon.ideasonboard.com>
Date:   Wed, 18 Dec 2019 17:49:42 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Neil Armstrong <narmstrong@...libre.com>
Cc:     a.hajda@...sung.com, jonas@...boo.se, jernej.skrabec@...l.net,
        boris.brezillon@...labora.com, linux-amlogic@...ts.infradead.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 02/10] drm/bridge: dw-hdmi: add max bpc connector
 property

Hi Neil and Jonas,

Thank you for the patch.

On Wed, Dec 18, 2019 at 04:46:29PM +0100, Neil Armstrong wrote:
> From: Jonas Karlman <jonas@...boo.se>
> 
> Add the max_bpc property to the dw-hdmi connector to prepare support
> for 10, 12 & 16bit output support.
> 
> Signed-off-by: Jonas Karlman <jonas@...boo.se>
> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
> ---
>  drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> index 6a0b4b3a6739..e7a0600f8cc5 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> @@ -2368,6 +2368,10 @@ static int dw_hdmi_bridge_attach(struct drm_bridge *bridge)
>  				    DRM_MODE_CONNECTOR_HDMIA,
>  				    hdmi->ddc);
>  
> +	drm_atomic_helper_connector_reset(connector);
> +
> +	drm_connector_attach_max_bpc_property(connector, 8, 16);
> +

I'm not asking you to rework this, but have you given any thought on how
we would be able to support this feature in a model where the bridge
wouldn't create a connector anymore (as done in the latest version of
the omapdrm series) ?

>  	if (hdmi->version >= 0x200a && hdmi->plat_data->use_drm_infoframe)
>  		drm_object_attach_property(&connector->base,
>  			connector->dev->mode_config.hdr_output_metadata_property, 0);

-- 
Regards,

Laurent Pinchart