[Bug 24462] New: r600: spread spectrum: flickering screen (bisected)

[Bug 24462] New: r600: spread spectrum: flickering screen (bisected)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=24462

           Summary: r600: spread spectrum: flickering screen (bisected)
           Product: Drivers
           Version: 2.5
    Kernel Version: 2.6.37-rc5
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
        AssignedTo: drivers_video-dri@kernel-bugs.osdl.org
        ReportedBy: kronos.it@gmail.com
        Regression: Yes


2.6.37-rc5 exhibits a slight screen (notebook panel) flickering, mostly
noticeable around text (e.g. white-on-black in xterm) with occasional
horizontal lines; using 2.6.36 as known "good" kernel I've bisected the issue
down to this commit:

ba032a58d1f320039e7850fb6e8651695c1aa571 is the first bad commit
commit ba032a58d1f320039e7850fb6e8651695c1aa571
Author: Alex Deucher <alexdeucher@gmail.com>
Date:   Mon Oct 4 17:13:01 2010 -0400

    drm/radeon/kms: rework spread spectrum handling

    This patch reworks spread spectrum handling to enable it
    properly on lvds and DP/eDP links.  It also fixes several
    bugs in the old spread spectrum code.

    - Use the ss recommended reference divider if available
    when calculating the pll
    - Use the proper ss command tables on pre-DCE3 asics
    - Avoid reading past the end of the ss info tables
    - Enable ss on evergreen asics (lvds, dp, tmds)
    - Enable ss on DP/eDP links

    Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
    Signed-off-by: Dave Airlie <airlied@redhat.com>

:040000 040000 2017e6abb9a12586686bcddb61479f2b158c9d7c
7e6117db061ef286ab6822455c65cf5492de7eaa M      drivers

Hardware is a M76:
01:00.0 VGA compatible controller: ATI Technologies Inc M76 [Radeon Mobility HD
2600 Series]

dmesg is attached.

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[Bug 24462] r600: spread spectrum: flickering screen (bisected)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=24462





--- Comment #1 from Alex Deucher <alexdeucher@gmail.com>  2010-12-08 17:11:56 ---
Created an attachment (id=39252)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=39252)
possible fix

Does this patch help?

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[Bug 24462] r600: spread spectrum: flickering screen (bisected)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=24462





--- Comment #2 from Luca Tettamanti <kronos.it@gmail.com>  2010-12-08 20:27:11 ---
(In reply to comment #1)
> Created an attachment (id=39252)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=39252) [details]
> possible fix
> 
> Does this patch help?

No, flickering it's still there. The parameters passed to
EnableSpreadSpectrumOnPPLL with 2.6.36 and 2.6.37-rc5 are:

ss->percentage = 0x1e
ss->type = 0x1
ss->step = 0x1
ss->delay = 0x2a
ss->range = 0x2
pll_id = 0x0

but 2.6.36 uses ENABLE_SPREAD_SPECTRUM_ON_PPLL_PS_ALLOCATION, while the newer
kernel uses ENABLE_LVDS_SS_PARAMETERS_V2 for the parameters (the only
difference is that the latter does not have ucPpll); is this correct?

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[Bug 24462] r600: spread spectrum: flickering screen (bisected)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=24462


Alex Deucher <alexdeucher@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |alexdeucher@gmail.com




--- Comment #3 from Alex Deucher <alexdeucher@gmail.com>  2010-12-08 20:39:57 ---
Please attach a copy of your vbios:
(as root)
(use lspci to get the bus id)
cd /sys/bus/pci/devices/<pci bus id>
echo 1 > rom
cat rom > /tmp/vbios.rom
echo 0 > rom

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[Bug 24462] r600: spread spectrum: flickering screen (bisected)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=24462





--- Comment #4 from Luca Tettamanti <kronos.it@gmail.com>  2010-12-08 20:47:55 ---
Created an attachment (id=39342)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=39342)
M76 vbios

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[Bug 24462] r600: spread spectrum: flickering screen (bisected)

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https://bugzilla.kernel.org/show_bug.cgi?id=24462





--- Comment #5 from Alex Deucher <alexdeucher@gmail.com>  2010-12-08 21:14:47 ---
Created an attachment (id=39362)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=39362)
possible fix

(In reply to comment #2)
> but 2.6.36 uses ENABLE_SPREAD_SPECTRUM_ON_PPLL_PS_ALLOCATION, while the newer
> kernel uses ENABLE_LVDS_SS_PARAMETERS_V2 for the parameters (the only
> difference is that the latter does not have ucPpll); is this correct?

That is correct.  I suspect it's the pll that's problematic:
if (ss_enabled) {
        if (ss->refdiv) {
                pll->flags |= RADEON_PLL_USE_REF_DIV;
                pll->reference_div = ss->refdiv;
        }
}

It uses a fixed reference divider of 2 in your case.  Does the attached patch
help?  Please also try this patch in conjunction with the patch in comment 1.

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[Bug 24462] r600: spread spectrum: flickering screen (bisected)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=24462


Rafael J. Wysocki <rjw@sisk.pl> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |florian@mickler.org,
                   |                            |maciej.rutecki@gmail.com,
                   |                            |rjw@sisk.pl
             Blocks|                            |21782




--- Comment #6 from Rafael J. Wysocki <rjw@sisk.pl>  2010-12-08 22:12:17 ---
First-Bad-Commit : ba032a58d1f320039e7850fb6e8651695c1aa571

Handled-By : Alex Deucher <alexdeucher@gmail.com>

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[Bug 24462] r600: spread spectrum: flickering screen (bisected)

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https://bugzilla.kernel.org/show_bug.cgi?id=24462





--- Comment #7 from Luca Tettamanti <kronos.it@gmail.com>  2010-12-08 22:32:06 ---
(In reply to comment #5)
> Does the attached patch
> help?  Please also try this patch in conjunction with the patch in comment 1.

Still not working, even with the first patch applied.

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[Bug 24462] r600: spread spectrum: flickering screen (bisected)

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=24462


Alex Deucher <alexdeucher@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #39252|0                           |1
        is obsolete|                            |
  Attachment #39362|0                           |1
        is obsolete|                            |




--- Comment #8 from Alex Deucher <alexdeucher@gmail.com>  2010-12-08 23:05:27 ---
Created an attachment (id=39372)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=39372)
possible fix

This patch disables use of the ss fixed ref divide and should fix it.

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[Bug 24462] r600: spread spectrum: flickering screen (bisected)

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https://bugzilla.kernel.org/show_bug.cgi?id=24462





--- Comment #9 from Luca Tettamanti <kronos.it@gmail.com>  2010-12-09 20:12:05 ---
(In reply to comment #8)
> This patch disables use of the ss fixed ref divide and should fix it.

Yes, taking out that code worked. I'm of course available for further testing
if you're not satisfied with this workaround ;)

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[Bug 24462] r600: spread spectrum: flickering screen (bisected)

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Florian Mickler <florian@mickler.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |PATCH_ALREADY_AVAILABLE




--- Comment #10 from Florian Mickler <florian@mickler.org>  2010-12-17 00:43:13 ---
Patch: https://bugzilla.kernel.org/attachment.cgi?id=39372

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[Bug 24462] r600: spread spectrum: flickering screen (bisected)

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--- Comment #11 from Alex Deucher <alexdeucher@gmail.com>  2010-12-20 06:57:15 ---
I've sent the patch to Dave.  It should show up in his next drm pull request.

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[Bug 24462] r600: spread spectrum: flickering screen (bisected)

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Rafael J. Wysocki <rjw@sisk.pl> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |CLOSED
         Resolution|PATCH_ALREADY_AVAILABLE     |CODE_FIX




--- Comment #12 from Rafael J. Wysocki <rjw@sisk.pl>  2010-12-29 22:48:03 ---
Fixed by commit e5fd205 drm/radeon/kms: disable ss fixed ref divide .

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[Bug 24462] r600: spread spectrum: flickering screen (bisected)

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--- Comment #13 from Alex Deucher <alexdeucher@gmail.com>  2011-02-11 06:57:54 ---
Luca, can you try re-enabling this code with 2.6.38-rc4 or newer?  Do you still
have problems?

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[Bug 24462] r600: spread spectrum: flickering screen (bisected)

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--- Comment #14 from Alex Deucher <alexdeucher@gmail.com>  2011-02-11 07:32:50 ---
Created an attachment (id=47282)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=47282)
better fix

Can you try the following patch against 2.6.38-rc4 or newer and make sure all
is working well?

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[Bug 24462] r600: spread spectrum: flickering screen (bisected)

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--- Comment #15 from Luca Tettamanti <kronos.it@gmail.com>  2011-02-11 16:09:40 ---
(In reply to comment #14)
> Created an attachment (id=47282)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=47282) [details]
> better fix
> 
> Can you try the following patch against 2.6.38-rc4 or newer and make sure all
> is working well?

2.6.38-rc4 plus the patch looks good, thanks!

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[Bug 24462] r600: spread spectrum: flickering screen (bisected)

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--- Comment #16 from Alex Deucher <alexdeucher@gmail.com>  2011-02-12 01:17:21 ---
Created an attachment (id=47482)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=47482)
new patch

Can you try this patch?  Try uncommenting the following lines to see if either
of those flags work as well.  Try them individually and together if possible
and report back which, if any, helps.

/*pll->flags |= RADEON_PLL_PREFER_MINM_OVER_MAXP;*/

/*if (ASIC_IS_AVIVO(rdev))
        pll->flags |= RADEON_PLL_USE_FRAC_FB_DIV;*/

Thanks!

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[Bug 24462] r600: spread spectrum: flickering screen (bisected)

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--- Comment #17 from Luca Tettamanti <kronos.it@gmail.com>  2011-02-14 13:56:01 ---
(In reply to comment #16)
> Created an attachment (id=47482)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=47482) [details]
> new patch
> 
> Can you try this patch?  Try uncommenting the following lines to see if either
> of those flags work as well.  Try them individually and together if possible
> and report back which, if any, helps.
> 
> /*pll->flags |= RADEON_PLL_PREFER_MINM_OVER_MAXP;*/
> 
> /*if (ASIC_IS_AVIVO(rdev))
>         pll->flags |= RADEON_PLL_USE_FRAC_FB_DIV;*/

The first one alone works, the second one alone does *not* work, both together
work fine.

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[Bug #24462] r600: spread spectrum: flickering screen (bisected)

[Rafael J. Wysocki]

This message has been generated automatically as a part of a summary report
of recent regressions.

The following bug entry is on the current list of known regressions
from 2.6.36.  Please verify if it still should be listed and let the tracking team
know (either way).


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=24462
Subject		: r600: spread spectrum: flickering screen (bisected)
Submitter	: Luca Tettamanti <kronos.it@gmail.com>
Date		: 2010-12-08 16:18 (12 days old)
First-Bad-Commit: http://git.kernel.org/linus/ba032a58d1f320039e7850fb6e8651695c1aa571
Handled-By	: Alex Deucher <alexdeucher@gmail.com>
Patch		: https://bugzilla.kernel.org/attachment.cgi?id=39372

[Bug #24462] r600: spread spectrum: flickering screen (bisected)

[Rafael J. Wysocki]

This message has been generated automatically as a part of a summary report
of recent regressions.

The following bug entry is on the current list of known regressions
from 2.6.36.  Please verify if it still should be listed and let the tracking team
know (either way).


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=24462
Subject		: r600: spread spectrum: flickering screen (bisected)
Submitter	: Luca Tettamanti <kronos.it-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date		: 2010-12-08 16:18 (12 days old)
First-Bad-Commit: http://git.kernel.org/linus/ba032a58d1f320039e7850fb6e8651695c1aa571
Handled-By	: Alex Deucher <alexdeucher-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Patch		: https://bugzilla.kernel.org/attachment.cgi?id=39372