linux-kernel - Re: [PATCH] drm/mediatek: hdmi: Filter interlaced resolutions

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Message-ID: <1485238365.30572.5.camel@mtksdaap41>
Date:   Tue, 24 Jan 2017 14:12:45 +0800
From:   CK Hu <ck.hu@...iatek.com>
To:     Bibby Hsieh <bibby.hsieh@...iatek.com>
CC:     David Airlie <airlied@...ux.ie>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        <dri-devel@...ts.freedesktop.org>,
        <linux-mediatek@...ts.infradead.org>,
        Yingjoe Chen <yingjoe.chen@...iatek.com>,
        Cawa Cheng <cawa.cheng@...iatek.com>,
        Daniel Kurtz <djkurtz@...omium.org>,
        "Philipp Zabel" <p.zabel@...gutronix.de>,
        YT Shen <yt.shen@...iatek.com>,
        "Thierry Reding" <thierry.reding@...il.com>,
        Mao Huang <littlecvr@...omium.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        "Sascha Hauer" <kernel@...gutronix.de>
Subject: Re: [PATCH] drm/mediatek: hdmi: Filter interlaced resolutions

Hi, Bibby:

On Tue, 2017-01-24 at 13:10 +0800, Bibby Hsieh wrote:
> Current Mediatek DRM driver does not support interlaced mode, and
> will hang if such resolution is used: Filter those to prevent
> kernel hangs, until the DRM driver is fixed properly.
> 
> Signed-off-by: Bibby Hsieh <bibby.hsieh@...iatek.com>

Acked-by: CK Hu <ck.hu@...iatek.com>

> ---
>  drivers/gpu/drm/mediatek/mtk_hdmi.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
> index 0e8c4d9..e33678d 100644
> --- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
> @@ -1244,6 +1244,8 @@ static int mtk_hdmi_conn_mode_valid(struct drm_connector *conn,
>  			return MODE_BAD;
>  	}
>  
> +	if (mode->flags & DRM_MODE_FLAG_INTERLACE)
> +		return MODE_NO_INTERLACE;
>  	if (mode->clock < 27000)
>  		return MODE_CLOCK_LOW;
>  	if (mode->clock > 297000)