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Message-ID: <20240906-strange-spiffy-nautilus-330add@houat>
Date: Fri, 6 Sep 2024 09:51:41 +0200
From: Maxime Ripard <mripard@...nel.org>
To: Adam Ford <aford173@...il.com>
Cc: Dominique Martinet <dominique.martinet@...ark-techno.com>, 
	Liu Ying <victor.liu@....com>, Andrzej Hajda <andrzej.hajda@...el.com>, 
	Neil Armstrong <neil.armstrong@...aro.org>, Robert Foss <rfoss@...nel.org>, 
	Laurent Pinchart <Laurent.pinchart@...asonboard.com>, Jonas Karlman <jonas@...boo.se>, 
	Jernej Skrabec <jernej.skrabec@...il.com>, Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
	Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>, 
	Daniel Vetter <daniel@...ll.ch>, Shawn Guo <shawnguo@...nel.org>, 
	Sascha Hauer <s.hauer@...gutronix.de>, Pengutronix Kernel Team <kernel@...gutronix.de>, 
	Fabio Estevam <festevam@...il.com>, Lucas Stach <l.stach@...gutronix.de>, 
	Frieder Schrempf <frieder.schrempf@...tron.de>, dri-devel@...ts.freedesktop.org, imx@...ts.linux.dev, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/bridge: imx8mp-hdmi-tx: allow 0.5% margin with
 selected clock

On Thu, Sep 05, 2024 at 08:23:51PM GMT, Adam Ford wrote:
> On Wed, Sep 4, 2024 at 3:31 AM Dominique Martinet
> <dominique.martinet@...ark-techno.com> wrote:
> >
> > This allows the hdmi driver to pick e.g. 64.8MHz instead of 65Mhz when we
> > cannot output the exact frequency, enabling the imx8mp HDMI output to
> > support more modes
> >
> I went from 19 options on Modetest with my AOC 4K monitor to 31.  Of
> those 31, three did not appear to sync, but not all the frequencies in
> the LUT sync for me either, so I have no objection to moving forward
> with this, but I wonder if we should have a note in there about why we
> have a 5% tolerance.

Yeah, I agree, it's something you want a comment for.

Maxime

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