linux-kernel - Re: [PATCH] DRM: ARC: PGU: interlaced mode not supported

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Date:   Wed, 11 Mar 2020 14:21:52 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>
Cc:     dri-devel@...ts.freedesktop.org,
        Alexey Brodkin <Alexey.Brodkin@...opsys.com>,
        linux-snps-arc@...ts.infradead.org, linux-kernel@...r.kernel.org,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, stable@...r.kernel.org
Subject: Re: [PATCH] DRM: ARC: PGU: interlaced mode not supported

On Wed, Mar 11, 2020 at 04:13:10PM +0300, Eugeniy Paltsev wrote:
> Filter out interlaced modes as they are not supported by ARC PGU
> hardware.
> 
> Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>
> ---
>  drivers/gpu/drm/arc/arcpgu_crtc.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/gpu/drm/arc/arcpgu_crtc.c b/drivers/gpu/drm/arc/arcpgu_crtc.c
> index 8ae1e1f97a73..c854066d4c75 100644
> --- a/drivers/gpu/drm/arc/arcpgu_crtc.c
> +++ b/drivers/gpu/drm/arc/arcpgu_crtc.c
> @@ -67,6 +67,9 @@ static enum drm_mode_status arc_pgu_crtc_mode_valid(struct drm_crtc *crtc,
>  	long rate, clk_rate = mode->clock * 1000;
>  	long diff = clk_rate / 200; /* +-0.5% allowed by HDMI spec */
>  
> +	if (mode->flags & DRM_MODE_FLAG_INTERLACE)
> +		return MODE_NO_INTERLACE;
> +
>  	rate = clk_round_rate(arcpgu->clk, clk_rate);
>  	if ((max(rate, clk_rate) - min(rate, clk_rate) < diff) && (rate > 0))
>  		return MODE_OK;
> -- 
> 2.21.1
> 

<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read:
    https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
for how to do this properly.

</formletter>