[Bug 84309] New: [BayTrail] Linux console may not output after reboot.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84309

          Priority: medium
            Bug ID: 84309
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BayTrail] Linux console may not output after reboot.
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: rick.chen at atrustcorp.com
          Hardware: x86 (IA32)
            Status: NEW
           Version: DRI CVS
         Component: DRM/Intel
           Product: DRI

Created attachment 106830
  --> https://bugs.freedesktop.org/attachment.cgi?id=106830&action=edit
dmesg output when error occurred.

Linux 3.14.7/3.14.14
Baytrail CPU

Boot into linux without X, use console output to HDMIA1.
Sometimes ther is no display output after perform reboot[occurrance 1/10],
power on seems okay.

When there display not output, ttyS4 of HSUART is okay.

Use intel_reg_dumper to dump the register value to comapre normal and abnormal
situation:

 DPLL_A_MD: 0x60ff2cdf  (have output)
 DPLL_A_MD: 0x70ff2ddf   (no output)

 DPLL_B: 0x60ff2cdf (disabled, dvo, VGA, TV A clock, unknown mode, p1 = 1, p2 =
0)   (have output)
 DPLL_B: 0x70ff2ddf (disabled, dvo, TV A clock, unknown mode, p1 = 1, p2 = 0,
using FPx1!)  (no output)

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