linux-kernel - Re: [PATCH v4 02/11] drm/bridge: dw-hdmi: add max bpc connector property

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Date:   Mon, 17 Feb 2020 07:38:58 +0100
From:   Jernej Škrabec <jernej.skrabec@...l.net>
To:     a.hajda@...sung.com, Laurent.pinchart@...asonboard.com,
        jonas@...boo.se, boris.brezillon@...labora.com,
        Neil Armstrong <narmstrong@...libre.com>
Cc:     linux-amlogic@...ts.infradead.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org,
        Neil Armstrong <narmstrong@...libre.com>
Subject: Re: [PATCH v4 02/11] drm/bridge: dw-hdmi: add max bpc connector property

Hi!

Dne četrtek, 06. februar 2020 ob 20:18:25 CET je Neil Armstrong napisal(a):
> 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
> 9e0927d22db6..051001f77dd4 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> @@ -2406,6 +2406,10 @@ static int dw_hdmi_bridge_attach(struct drm_bridge
> *bridge) DRM_MODE_CONNECTOR_HDMIA,
>  				    hdmi->ddc);
> 
> +	drm_atomic_helper_connector_reset(connector);

Why is this reset needed?

Best regards,
Jernej

> +
> +	drm_connector_attach_max_bpc_property(connector, 8, 16);
> +
>  	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);