[Bug 108915] New: [ICL] Trying to use non-existent 6th (F) DDI port

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108915

            Bug ID: 108915
           Summary: [ICL] Trying to use non-existent 6th (F) DDI port
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: imre.deak at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

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))

One example:
https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_5234/fi-icl-y/boot0.log

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