[Bug 102403] [BAT][BXT] loads of "*ERROR* Atomic update failure on pipe A" when using a DSI panel

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102403

--- Comment #4 from Uma Shankar <uma.shankar at intel.com> ---
For gen9 platforms, dsi timings are driven from port instead of pipe
(unlike ddi). Thus, we can't rely on pipe registers to get the timing
information. Even scanline register read will not be functional.
This is causing vblank evasion logic to fail since it relies on
scanline, causing atomic update failure warnings.

We created a patch which uses pipe framestamp and current timestamp registers
to calculate scanline. This is an indirect way to get the scanline.
It helps resolve atomic update failure for gen9 dsi platforms.
https://patchwork.kernel.org/patch/9944249/

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