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

From: Tomi Valkeinen
Date: Wed Dec 14 2016 - 03:43:42 EST

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.


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