linux-kernel - Re: [BISECTED, REGRESSION] v4.12-rc: omapdrm fails to probe on Nokia N900

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Date:   Fri, 30 Jun 2017 11:47:55 +0300
From:   Tomi Valkeinen <tomi.valkeinen@...com>
To:     Aaro Koskinen <aaro.koskinen@....fi>,
        Peter Ujfalusi <peter.ujfalusi@...com>
CC:     Tony Lindgren <tony@...mide.com>, <linux-kernel@...r.kernel.org>,
        <linux-omap@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>
Subject: Re: [BISECTED, REGRESSION] v4.12-rc: omapdrm fails to probe on Nokia
 N900

On 30/06/17 09:41, Tomi Valkeinen wrote:

> So, I don't know... I guess I need to try to invent some horrible hacks
> around the driver to somehow manage the omap3 problems. Perhaps
> disabling/enabling the outputs when sync lost happens...

Well, I tried that (attached), but it didn't work either. For some
reason the error worker seems to stop after the disable. Possibly the
irq flood keeps it from running, so maybe it should catch all the errors
(I see underflows too).

Sorry, but I can't use more time on this today, and I'm leaving for
vacation today. I hope Laurent can help during my absence.

We could try reverting the patch you mention, but I think it doesn't
cause the problem.

Did you have CONFIG_DRM_OMAP_CONNECTOR_ANALOG_TV enabled earlier when
things worked? If you didn't, and the dts did not contain display
aliases, I think the omapdrm may have started without TV. So maybe the
TV side is the culprit, somehow (I couldn't find anything when I looked
at that side either).

 Tomi

View attachment "0001-drm-omap-hack-error-worker.patch" of type "text/x-patch" (3880 bytes)

Download attachment "signature.asc" of type "application/pgp-signature" (820 bytes)