[Letux-kernel] module_mipi_dsi_driver panel with omapdrm?

H. Nikolaus Schaller hns at goldelico.com
Wed Aug 5 14:00:46 CEST 2020

Hi David,
good to know! Would mean that the combination of HDMI and DSI may make trouble.

Maybe we should simply wait ca. 14 days until I have access to my own test setup and can run such tests easily and within minutes myself.
Since it is already broken since v5.7-rc1 it should be possible to wait that time :)

Best regards,

> Am 05.08.2020 um 13:53 schrieb David Shah <dave at ds0.me>:
> If it helps, I can confirm that HDMI was working fine on the uEVM the last time I test 5.7 (I think it was the final rc before release).
> David
> -------- Original message --------
> From: "H. Nikolaus Schaller" <hns at goldelico.com>
> Date: 05/08/2020 12:49 (GMT+00:00)
> To: Sebastian Reichel <sebastian.reichel at collabora.com>
> Cc: Laurent Pinchart <laurent.pinchart at ideasonboard.com>, Tony Lindgren <tony at atomide.com>, Tomi Valkeinen <tomi.valkeinen at ti.com>, Linux-OMAP <linux-omap at vger.kernel.org>, Jyri Sarha <jsarha at ti.com>, kernel at pyra-handheld.com, Discussions about the Letux Kernel <letux-kernel at openphoenux.org>, David Shah <dave at ds0.me>
> Subject: Re: module_mipi_dsi_driver panel with omapdrm?
> Hi,
> > Am 05.08.2020 um 13:28 schrieb Sebastian Reichel <sebastian.reichel at collabora.com>:
> > 
> > Hi,
> > 
> > On Wed, Aug 05, 2020 at 11:19:20AM +0200, H. Nikolaus Schaller wrote:
> >> What I do not yet understand is how Laurent's patch should be able
> >> to break it.
> > 
> > omapdrm will not probe successfully if any DT enabled component
> > does not probe correctly. Since the patch you identified touched
> > HDMI and VENC and you are probably using HDMI, I suggest looking
> > there first.
> Yes, that is a very good explanation.
> Maybe there is a subtle change in how the HDMI connector has to be defined
> which is missing in our (private) DTB. Maybe the OMAP5-uEVM DTS gives a hint.
> A quick check shows last hdmi specific change for omap5-board-common or uevm
> was in 2017 but I may have missed something.
> There are 715a5a978733f0 and 671ab615bd507f which arrived in v5.7-rc1 as well
> and are related to hdmi clocks. So this may be (or not) and influencing factor.
> BR and thanks,
> Nikolaus

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