[Bug 82880] [BYT dsi] Black screen on modesetting with Dell Venue 8 Pro (version with screen with MIPI panel index = 3)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=82880

Hans de Goede <jwrdegoede at fedoraproject.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|FIXED                       |---
                 CC|                            |jwrdegoede at fedoraproject.or
                   |                            |g
            Summary|[BYT dsi] Black screen on   |[BYT dsi] Black screen on
                   |modesetting with Dell Venue |modesetting with Dell Venue
                   |8 Pro (older firmware) on   |8 Pro (version with screen
                   |3.16.x                      |with MIPI panel index = 3)
             Status|CLOSED                      |REOPENED

--- Comment #39 from Hans de Goede <jwrdegoede at fedoraproject.org> ---
I don't think this has anything to do with the firmware version on the Dell
Venue 8 5130. Mine is working fine, but as reported e.g. also in bug 101205
(which is really about Pipo devices) their are 2 different versions of the Dell
Venue 8 5130. With different panels, the working one has:

Jan 01 01:42:14 phone kernel: [drm:intel_bios_init [i915]] Found MIPI Config
block, panel index = 5
Jan 01 01:42:14 phone kernel: [drm:intel_bios_init [i915]] No MIPI Sequence
found, parsing complete

Where as the broken one has:

Mar 10 10:10:24 phone kernel: [drm:intel_bios_init [i915]] Found MIPI Config
block, panel index = 3
Mar 10 10:10:24 phone kernel: [drm:intel_bios_init [i915]] Found MIPI sequence
block v1

Note different panel indexes and if you look at the logs in bug 101205, which
contains logs for both a good and a bad unit then you will also see different
timings.

Jan Brummer has send me a Dell Venue 8 5130 with the trouble-some screen so
that I could take a shot at fixing this.

I've actually managed to find the problem and I've a patch ready, but it is not
pretty...

In the mean time lets open this bug for proper tracking of this until the
problem is fixed on units with a panel index of 3.

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