linux-kernel - Re: [PATCHv2] drm: fb_helper: prefer to use mode, which is not DRM_MODE_TYPE

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Message-ID: <5534D721.1060206@radekdostal.com>
Date:	Mon, 20 Apr 2015 12:38:25 +0200
From:	Radek Dostál <rd@...ekdostal.com>
To:	Chris Wilson <chris@...is-wilson.co.uk>, airlied@...ux.ie,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv2] drm: fb_helper: prefer to use mode, which is not DRM_MODE_TYPE_USERDEF

Hi Chris,

On 04/20/2015 11:58 AM, Chris Wilson wrote:
> Hmm, so that should be before the clock comparison as well to fix your
> example. Not as neat.

indeed that is required.

> The other idea I was considering was not adding the GTF cmdline mode if
> the probed modes already contain one of a matching resolution. The goal
> here is to also not present a mode to userspace that is invalid.

Unfortunately you can not do that. I already tried. At the time when
drm_helper_probe_add_cmdline_mode is called EDID informations are not
yet available.

Only option would be to remove the GTF cmdline mode, when matching mode
is found in EDID.

Thanks,
Radek
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