[Bug 17902] [830M] need support for DVO-LVDS via na2501

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=17902

--- Comment #63 from Gilles Dartiguelongue <gilles.dartiguelongue at esiee.org> 2012-04-15 08:56:35 PDT ---
For the record, I'm still working on this from time to time.
I ported the patch to kernel land quite easily, but still can't figure out what
is the problem with register read failures.

Example from a 3.3.1 kernel booted with i915.modeset=1 drm.debug=0x04:

Apr 15 17:52:11 mobilix kernel: [drm:ns2501_init], init ns2501 dvo controller
successfully!
Apr 15 17:52:11 mobilix kernel: [drm:ns2501_readb], Unable to read register
0x08 from i915 gmbus dpb:38.
Apr 15 17:52:11 mobilix kernel: [drm:ns2501_readb], Unable to read register
0x08 from i915 gmbus dpb:38.
Apr 15 17:52:11 mobilix kernel: [drm:ns2501_readb], Unable to read register
0x08 from i915 gmbus dpb:38.
Apr 15 17:52:11 mobilix kernel: [drm:ns2501_readb], Unable to read register
0x09 from i915 gmbus dpb:38.
Apr 15 17:52:11 mobilix kernel: [drm:ns2501_readb], Unable to read register
0x08 from i915 gmbus dpb:38.

I would really appreciate someone with drm/intel knowledge helping here.
Will post patches later (code is really not that different that my previous
post about this).

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