[Bug 75244] New: [BYT Regression]igt/gem_concurrent_blit/gtt-gpu-read-after-write-forked causes *ERROR* timed out waiting for Punit

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=75244

          Priority: high
            Bug ID: 75244
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [BYT
                    Regression]igt/gem_concurrent_blit/gtt-gpu-read-after-
                    write-forked causes *ERROR* timed out waiting for
                    Punit
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: huax.lu at intel.com
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 94408
  --> https://bugs.freedesktop.org/attachment.cgi?id=94408&action=edit
dmesg

System Environment:
--------------------------
Platform: Baytrail
Kernel(drm-intel-nightly)1be8f2b4dd6d3db00af24d4891c82d2650bd282d

Bug detailed description:
------------------------- 
run ./gem_concurrent_blit --run-subtest gtt-gpu-read-after-write-forked,
reports 
<3>[  570.041279] [drm:vlv_set_rps_idle] *ERROR* timed out waiting for Punit.
It happens on Baytrail with -nightly and -queued kernel.
igt/gem_concurrent_blit/gtt-overwrite-source-forked also has this issue.

The latest known good commit: 87adfb03493141c7c61df06440d07f6c6c9fd24c
The latest known bad commit: 4c0e552882114d1edb588242d45035246ab078a0

output:                                                                         
IGT-Version: 1.5-g06189c6 (x86_64) (Linux:
3.13.0_drm-intel-next-queued_4c0e55_2                                          
                                                      0140219+ x86_64)
using 2x512 buffers, each 1MiB
Subtest gtt-gpu-read-after-write-forked: SUCCESS

# dmesg -r | egrep "<[1-3]>" |grep drm
<3>[  570.041279] [drm:vlv_set_rps_idle] *ERROR* timed out waiting for Punit
<3>[  821.361236] [drm:vlv_set_rps_idle] *ERROR* timed out waiting for Punit

Reproduce steps:
-------------------------
1. ./gem_concurrent_blit --run-subtest gtt-gpu-read-after-write-forked

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