linux-kernel - Re: [PATCH v5 2/7] drm/panel: simple: Add ability to override typical timing

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Message-ID: <20190630205514.GA17046@ravnborg.org>
Date:   Sun, 30 Jun 2019 22:55:14 +0200
From:   Sam Ravnborg <sam@...nborg.org>
To:     Douglas Anderson <dianders@...omium.org>
Cc:     devicetree@...r.kernel.org, David Airlie <airlied@...ux.ie>,
        Jeffy Chen <jeffy.chen@...k-chips.com>,
        linux-kernel@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        linux-rockchip@...ts.infradead.org,
        Thierry Reding <thierry.reding@...il.com>,
        Sean Paul <seanpaul@...omium.org>,
        dri-devel@...ts.freedesktop.org,
        Boris Brezillon <boris.brezillon@...labora.com>,
        Enric Balletbò <enric.balletbo@...labora.com>,
        Stéphane Marchesin <marcheu@...omium.org>,
        Ezequiel Garcia <ezequiel@...labora.com>, mka@...omium.org,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>
Subject: Re: [PATCH v5 2/7] drm/panel: simple: Add ability to override
 typical timing

Hi Douglas.

> > +
> > +	/* Only add timings if override was not there or failed to validate */
> > +	if (num == 0 && panel->desc->num_timings)
> > +		num = panel_simple_get_timings_modes(panel);
> > +
> > +	/*
> > +	 * Only add fixed modes if timings/override added no mode.
> 
> This part I fail to understand.
> If we have a panel where we in panel-simple have specified the timings,
> and done so using display_timing so with proper {min, typ, max} then it
> should be perfectly legal to specify a more precise variant in the DT
> file.
> Or what did I miss here?

Got it now.
If display_mode is used for timings this is what you call "fixed mode".
Hmm, if I got confused someone else may also be confused by this naming.

	Sam