[Bug 90863] New: [SKL]igt/pm_rpm causes [drm:skl_set_power_well [i915]] *ERROR* CSR firmware not ready (2)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90863

            Bug ID: 90863
           Summary: [SKL]igt/pm_rpm causes [drm:skl_set_power_well [i915]]
                    *ERROR* CSR firmware not ready (2)
           Product: DRI
           Version: unspecified
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: huax.lu at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 116308
  --> https://bugs.freedesktop.org/attachment.cgi?id=116308&action=edit
dmesg

==System Environment==
--------------------------
Regression: not sure, only happens on drm-intel-nightly kernel.

Non-working platforms: SKL

==kernel==
--------------------------
drm-intel-nightly/7d26f93488c5aa488867b3e3769bd4b4fb88d657
commit 7d26f93488c5aa488867b3e3769bd4b4fb88d657
Author: Jani Nikula <jani.nikula at intel.com>
Date:   Wed Jun 3 14:28:08 2015 +0300

    drm-intel-nightly: 2015y-06m-03d-11h-27m-41s UTC integration manifest

==Bug detailed description==
-----------------------------
pm_rpm causes [drm:skl_set_power_well [i915]] *ERROR* CSR firmware not ready
(2).
I test it on following 10 merged branch, it only happens on drm-intel-nightly
kernel.
Test kernel branch:
atomic-core  drm-intel-fixes        drm-intel-nightly  for-next
bxt-stage1   drm-intel-next-fixes   drm-misc
drm-fixes    drm-intel-next-queued  drm-next

run ./pm_rpm --run-subtest dpms-lpsp
output:
IGT-Version: 1.10-g0d16473 (x86_64) (Linux:
4.1.0-rc6_drm-intel-nightly_7d26f9_20150604+ x86_64)
Runtime PM support: 1
PC8 residency support: 0
Test assertion failure function modeset_subtest, file pm_rpm.c:774:
Failed assertion: wait_for_suspended()
Last errno: 2, No such file or directory
Stack trace:
  #0 [__igt_fail_assert+0xf1]
  #1 [modeset_subtest+0x115]
  #2 [main+0x594]
  #3 [__libc_start_main+0xf5]
  #4 [_start+0x29]
  #5 [<unknown>+0x29]
Subtest dpms-lpsp failed.
**** DEBUG ****
Test assertion failure function modeset_subtest, file pm_rpm.c:774:
Failed assertion: wait_for_suspended()
Last errno: 2, No such file or directory
****  END  ****

==Reproduce steps==
---------------------------- 
1. ./pm_rpm --run-subtest dpms-lpsp

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