[Letux-kernel] OMAP5 Pyra: DSI Panel problems with 4.12-rc1

H. Nikolaus Schaller hns at goldelico.com
Mon May 22 17:23:24 CEST 2017

Hi Tomi,

> Am 22.05.2017 um 08:31 schrieb Tomi Valkeinen <tomi.valkeinen at ti.com>:
> Hi,
> On 20/05/17 14:30, H. Nikolaus Schaller wrote:
>> Hi Tomi,
>> after rebasing our Letux kernel to 4.12-rc1 our DSI panel stopped initializing.
>> DRM and X11 are up and running, but the panel fails to initialize and show anything.
>> We have not touched the code of our btl507212-w677l DSI driver.
>> Is there anything to consider on panel driver side?
>> What I can't 100% exclude is that we have additional hacks in the omapdss system
>> which may now be in conflict. For example we have your "[PATCH] dispc hackfix"
>> or "dss: remove export of venc modes".
> Can you try reverting 7d267f068a8b4944d52e8b0ae4c8fcc1c1c5c5ba

Yes, a revert makes it working again!

The interesting question is why it makes such a difference...

Are there additional dividers which depend on M and N? For example the
DSI LP clock? This could explain why a DPI panel (GTA04) simply works as before
and there is only a DSI communication problem during DSI panel initialization.

BR and thanks,
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