linux-kernel - Re: [PATCH] drm/bridge: anx6345: set correct BPC for display

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Message-ID: <11490050.O9o76ZdvQC@jernej-laptop>
Date:   Mon, 30 Mar 2020 01:29:42 +0200
From:   Jernej Škrabec <jernej.skrabec@...l.net>
To:     Andrzej Hajda <a.hajda@...sung.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, Torsten Duwe <duwe@....de>,
        Maxime Ripard <maxime@...no.tech>,
        Icenowy Zheng <icenowy@...c.io>,
        Sam Ravnborg <sam@...nborg.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Samuel Holland <samuel@...lland.org>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Vasily Khoruzhick <anarsoul@...il.com>
Cc:     Vasily Khoruzhick <anarsoul@...il.com>
Subject: Re: [PATCH] drm/bridge: anx6345: set correct BPC for display_info of connector

Hi!

Dne ponedeljek, 30. marec 2020 ob 00:22:53 CEST je Vasily Khoruzhick 
napisal(a):
> Some drivers (e.g. sun4i-drm) need this info to decide whether they
> need to enable dithering. Currently driver reports what panel supports
> and if panel supports 8 we don't get dithering enabled.
> 
> Hardcode BPC to 6 for now since that's the only BPC
> that driver supports.

Acked-by: Jernej Skrabec <jernej.skrabec@...l.net>

Best regards,
Jernej

> 
> Fixes: 6aa192698089 ("drm/bridge: Add Analogix anx6345 support")
> Signed-off-by: Vasily Khoruzhick <anarsoul@...il.com>
> ---
>  drivers/gpu/drm/bridge/analogix/analogix-anx6345.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/gpu/drm/bridge/analogix/analogix-anx6345.c
> b/drivers/gpu/drm/bridge/analogix/analogix-anx6345.c index
> d7cb10c599a3..ea5de9395662 100644
> --- a/drivers/gpu/drm/bridge/analogix/analogix-anx6345.c
> +++ b/drivers/gpu/drm/bridge/analogix/analogix-anx6345.c
> @@ -494,6 +494,9 @@ static int anx6345_get_modes(struct drm_connector
> *connector)
> 
>  	num_modes += drm_add_edid_modes(connector, anx6345->edid);
> 
> +	/* Driver currently supports only 6bpc */
> +	connector->display_info.bpc = 6;
> +
>  unlock:
>  	if (power_off)
>  		anx6345_poweroff(anx6345);