Some ICL SKUs support only 5 DDI ports (2 combo-PHY and 3 MG PHY) instead of the maximum of 6 ICL supports. We need a way to detect these SKUs based either on VBT or the PCI ID and prevent using the non-existent port.
SKL-Y is one such system, where this problem results in the following error whenever trying to use the non-existent port F:
<7>[ 10.710403] [drm:intel_power_well_enable [i915]] enabling AUX F
<4>[ 10.711756] ------------[ cut here ]------------
<4>[ 10.711760] WARN_ON(intel_wait_for_register(dev_priv, regs->driver, (0x1 << ((pw_idx) * 2)), (0x1 << ((pw_idx) * 2)), 1))
Is this bug duplicate of https://bugs.freedesktop.org/show_bug.cgi?id=108070 ?
T hink no, but let Imre to confirm
Not a duplicate, the root cause of this is described in the description of this bug, while the root cause of the other is described at
This issue is reported to BIOS team.
No updates yet.
Ref to WA: https://patchwork.freedesktop.org/series/54341/
Was this merged today Imre?
(In reply to Jani Saarinen from comment #7)
> Was this merged today Imre?
Author: Imre Deak <firstname.lastname@example.org>
Date: Thu Dec 20 17:52:11 2018 +0200
drm/i915/icl: Work around broken VBTs for port F detection
I think we can close this now even though for a proper solution we'll want to have the VBT fixed eventually.