linux-kernel - Re: [PATCH 3/4] drm/bridge: dw-hdmi: do not force "none" scan mode

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Date:   Mon, 2 Mar 2020 11:37:28 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Jernej Skrabec <jernej.skrabec@...l.net>
Cc:     a.hajda@...sung.com, narmstrong@...libre.com, jonas@...boo.se,
        airlied@...ux.ie, daniel@...ll.ch, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] drm/bridge: dw-hdmi: do not force "none" scan mode

Hi Jernej and Jonas,

Thank you for the patch.

On Sat, Feb 29, 2020 at 05:30:42PM +0100, Jernej Skrabec wrote:
> From: Jonas Karlman <jonas@...boo.se>
> 
> Setting scan mode to "none" confuses some TVs like LG B8, which randomly
> change overscan procentage over time. Digital outputs like HDMI and DVI,

s/procentage/percentage/ ?

> handled by this controller, don't really need overscan, so we can always
> set scan mode to underscan. Actually, this is exactly what
> drm_hdmi_avi_infoframe_from_display_mode() already does, so we can just
> remove offending line.
> 
> Signed-off-by: Jonas Karlman <jonas@...boo.se>
> [updated commit message]
> Signed-off-by: Jernej Skrabec <jernej.skrabec@...l.net>

Acked-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

> ---
>  drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 2 --
>  1 file changed, 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> index 9d7bfb1cb213..3d6021119942 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> @@ -1655,8 +1655,6 @@ static void hdmi_config_AVI(struct dw_hdmi *hdmi, struct drm_display_mode *mode)
>  			HDMI_EXTENDED_COLORIMETRY_XV_YCC_601;
>  	}
>  
> -	frame.scan_mode = HDMI_SCAN_MODE_NONE;
> -
>  	/*
>  	 * The Designware IP uses a different byte format from standard
>  	 * AVI info frames, though generally the bits are in the correct

-- 
Regards,

Laurent Pinchart