Nouveau - Oct 2012 - [Bug 56202] New: [regression][kms] Clock rework causes kms boot regression for NV4E (v3.7-rc1, 3.6+nouveau)

https://bugs.freedesktop.org/show_bug.cgi?id=56202

          Priority: medium
            Bug ID: 56202
          Assignee: nouveau at lists.freedesktop.org
           Summary: [regression][kms] Clock rework causes kms boot
                    regression for NV4E (v3.7-rc1, 3.6+nouveau)
        QA Contact: xorg-team at lists.x.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: ronald645 at gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: git
         Component: Driver/nouveau
           Product: xorg

Created attachment 68815
  --> https://bugs.freedesktop.org/attachment.cgi?id=68815&action=edit
v3.6.0+ @ the commit that caused the regression

The following commit causes KMS initialisation to result in a scrambled screen
with mostly blue elements. The screen responds to changes based on actual
content (e.g. system booting, lightdm starting).

drm/nouveau/clock: pull in the implementation from all over the place

I have tested and verified this regression on a 3.6 tree and the recent v3.7
tree pulled from git.kernel.org.

Below you will find some more data about my VGA card.

Attached you will find two dmesg output logs (don't know if they differ):

both are from the v3.7-rc1 tree (they are noted as 3.6.0+ in the logs)
dmesg-good.txt @ the commit before the one that caused the regression
dmesg-bad.txt @ the commit that caused the regression

00:05.0 0300: 10de:0244 (rev a2) (prog-if 00 [VGA controller])
    Subsystem: 103c:30b7
00:05.0 VGA compatible controller: NVIDIA Corporation C51 [GeForce Go 6150]
(rev a2) (prog-if 00 [VGA controller])
    Subsystem: Hewlett-Packard Company Presario V6133CL
    Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx-
    Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort-
<TAbort-
<MAbort- >SERR- <PERR- INTx-
    Latency: 0
    Interrupt: pin A routed to IRQ 18
    Region 0: Memory at b2000000 (32-bit, non-prefetchable) [size=16M]
    Region 1: Memory at c0000000 (64-bit, prefetchable) [size=256M]
    Region 3: Memory at b1000000 (64-bit, non-prefetchable) [size=16M]
    [virtual] Expansion ROM at 40000000 [disabled] [size=128K]
    Capabilities: [48] Power Management version 2
        Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
        Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
    Capabilities: [50] MSI: Enable- Count=1/1 Maskable- 64bit+
        Address: 0000000000000000  Data: 0000
    Kernel driver in use: nouveau

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--- Comment #1 from Ronald <ronald645 at gmail.com> ---
Created attachment 68816
  --> https://bugs.freedesktop.org/attachment.cgi?id=68816&action=edit
@ the commit before the one that caused the regression

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--- Comment #2 from Ronald <ronald645 at gmail.com> ---
I guess this just turned pretty obvious, I took another look at both the dmesg
output of both kernels.

Good kernel says:
+[drm] nouveau 0000:00:05.0: c:

Bad kernel says:
-[drm] nouveau 0000:00:05.0: c: core 24MHz

That is not a typo!

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--- Comment #3 from Ronald <ronald645 at gmail.com> ---
Created attachment 68829
  --> https://bugs.freedesktop.org/attachment.cgi?id=68829&action=edit
Difference between 3.6.0+ good and bad kernel dmesg output

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--- Comment #4 from Ronald <ronald645 at gmail.com> ---
Created attachment 68832
  --> https://bugs.freedesktop.org/attachment.cgi?id=68832&action=edit
NV4E BIOS ROM, retreived thru debugfs kernel v3.6.2

As recommended on the homepage, here is the VBIOS. This is all I can do for
now. Hope it helps...

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Ronald <ronald645 at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #68832|0                           |1
        is obsolete|                            |

--- Comment #5 from Ronald <ronald645 at gmail.com> ---
Created attachment 68835
  --> https://bugs.freedesktop.org/attachment.cgi?id=68835&action=edit
NV4E BIOS ROM, retreived thru debugfs kernel v3.6.2

This time not as text/plain...

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Ben Skeggs <skeggsb at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|nouveau at lists.freedesktop.o |skeggsb at gmail.com
                   |rg                          |

--- Comment #6 from Ben Skeggs <skeggsb at gmail.com> ---
Created attachment 68897
  --> https://bugs.freedesktop.org/attachment.cgi?id=68897&action=edit
possible fix for the issue

Are you able to try the attached patch please?

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