[Bug 99572] [BXT DP-MST] System hang/crash when plugging in USB typeC DP MST monitor

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99572

--- Comment #2 from nathan.d.ciobanu at linux.intel.com ---
I added the following check to make sure I trigger a stack trace otherwise the
system would reboot without giving me the crash log:

@@ -1862,6 +1863,10 @@ bool bxt_ddi_dp_set_dpll_hw_state(int clock,
        memset(&crtc_state->dpll_hw_state, 0,
               sizeof(crtc_state->dpll_hw_state));

+       if (!memcmp(&zeroes, &dpll_hw_state,
+              sizeof(crtc_state->dpll_hw_state)))
+           BUG();
+
        crtc_state->dpll_hw_state = dpll_hw_state;

        if (encoder->type == INTEL_OUTPUT_DP_MST) {

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