[Bug 77512] New: the start of upstream kernel is blocked at DRM/Radeon initialization

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=77512

          Priority: medium
            Bug ID: 77512
          Assignee: dri-devel at lists.freedesktop.org
           Summary: the start of upstream kernel is blocked at DRM/Radeon
                    initialization
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: xiong.y.zhang at intel.com
          Hardware: Other
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Radeon
           Product: DRI

Created attachment 97453
  --> https://bugs.freedesktop.org/attachment.cgi?id=97453&action=edit
dmesg when loading radeon module with drm.debug=0xe

Label: edv01  （Edisonville）
BIOS: EDVLCRB1.86B.0033.R00.1311200915
Processor: Avoton B0
Kernel version: upstream stable kernel 3.13.7

details:
After loading Radeon module, screen is freeze. But system can response to
"ctrl+alt+del". 
All upstream kernels since 3.14-rc1 have this issue. 

the Graphic ID:
01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc.
[AMD/ATI] Cedar [Radeon HD 5000/6000/7350/8350 Series] [1002:68f9]

I bisect the kernel and the first bad commit is:

commit b39146461f8ea158fe407455467b25b3be09d84e
Author: Alex Deucher <alexander.deucher at amd.com>
Date:   Wed Dec 18 19:11:27 2013 -0500

    drm/radeon: re-order firmware loading in preparation for dpm rework

    commit 01ac8794a77192236a4b91c33adf4177ac5a21f0 upstream.

    We need to reorder the driver init sequence to better accomodate
    dpm which needs to be loaded earlier in the init sequence.  Move
    fw init up so that it's available for dpm init.

    Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>

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