[Bug 90237] [SKL] "testdisplay -a" *ERROR* mismatch in base.adjusted_mode.crtc_clock (expected 13500, found 27000)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90237

--- Comment #5 from Ander Conselvan de Oliveira <conselvan2 at gmail.com> ---
The error in the first log,

*ERROR* mismatch in base.adjusted_mode.crtc_clock (expected 13500, found 27000)

happens when using a mode with DRM_MODE_FLAG_DBLCLK. Because of that flag,
intel_hdmi_compute_config() sets the pipe_config's pixel_multiplier to 2, which
in turns causes intel_modeset_pipe_config() to double the port clock. When we
read back the hardware configuration for state checking, ->get_pipe_config()
reads the port clock as doubled (27000 instead of 13500) and sets
adjusted_mode.crtc_clock to be equal to the port_clock.


In the second log, the mismatch happens with SKL scalers, so they should be
tracked in a separate bug if they still occur.

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