[Bug 90238] [BXT-P/SKL desktop/BDW] HDMI "testdisplay -y" shows wrong picture on every interlaced scanning resolution

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90238

--- Comment #15 from Mahesh Kumar <mahesh1.kumar at intel.com> ---
Created attachment 131708
  --> https://bugs.freedesktop.org/attachment.cgi?id=131708&action=edit
Proposed Patch

By-default IF-ID mode is used in interlace mode.
SKL+ doesn't support Y-tile with IF-ID mode, that is the reason,
There are underrun & distorted output.
Attached patch enables PF-ID mode of scaler for SKL.
There is limited testing done for this patch.
Please check with Attached patch & let me know if it solves the issue.

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