linux-kernel - Re: [PATCH 12/23] drm: omapdrm: plane: update fifo size on atomic update

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Date:   Wed, 14 Dec 2016 10:43:18 +0200
From:   Tomi Valkeinen <tomi.valkeinen@...com>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        <dri-devel@...ts.freedesktop.org>
CC:     Sebastian Reichel <sre@...nel.org>,
        Tony Lindgren <tony@...mide.com>,
        Aaro Koskinen <aaro.koskinen@....fi>,
        <linux-omap@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 12/23] drm: omapdrm: plane: update fifo size on atomic
 update

On 13/12/16 19:35, Laurent Pinchart wrote:
> Hi Sebastian,
> 
> Thank you for the patch.
> 
> On Tuesday 08 Mar 2016 17:39:44 Sebastian Reichel wrote:
>> This is a workaround for a hardware bug occuring
>> on OMAP3 with manually updated panels.
> 
> Could you please explain what the bug is and how the workaround operates ? Do 
> you have a reference to an errata document ?

I don't think I ever found out exactly why the problem happens. But on
OMAP3 DSI, the fifo thresholds had to be tuned slightly, otherwise DISPC
would stop. dispc_ovl_compute_fifo_thresholds() does that tuning if
"manual_update" parameter is set on OMAP3.

 Tomi



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