[Bug 103080] DC driver from drm-next-4.15-dc branch (upstream PR) not working

[Bug 103080] DC driver from drm-next-4.15-dc branch (upstream PR) not working

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https://bugs.freedesktop.org/show_bug.cgi?id=103080

Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |harry.wentland@amd.com
            Product|xorg                        |DRI
         QA Contact|xorg-team@lists.x.org       |
          Component|Driver/AMDgpu               |DRM/AMDgpu
           Assignee|xorg-driver-ati@lists.x.org |dri-devel@lists.freedesktop
                   |                            |.org

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[Bug 103080] DC driver from drm-next-4.15-dc branch (upstream PR) not working

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https://bugs.freedesktop.org/show_bug.cgi?id=103080

--- Comment #1 from Harry Wentland <harry.wentland@amd.com> ---
Hi Carlo,

please pass amdgpu.dc=1 module parameter or set CONFIG_DRM_AMD_DC_PRE_VEGA flag
at build.

With this branch we decided to only enable it by default for Vega ASICs. With
anything older than Vega you'll have to force enable it.

Harry

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[Bug 103080] DC driver from drm-next-4.15-dc branch (upstream PR) not working

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https://bugs.freedesktop.org/show_bug.cgi?id=103080

--- Comment #2 from Carlo Caione <carlo@caione.org> ---
Created attachment 134643
  --> https://bugs.freedesktop.org/attachment.cgi?id=134643&action=edit
CONFIG_DRM_AMD_DC_PRE_VEGA kernel Oops

(In reply to Harry Wentland from comment #1)
> Hi Carlo,
> 
> please pass amdgpu.dc=1 module parameter or set CONFIG_DRM_AMD_DC_PRE_VEGA
> flag at build.

This is interesting. When compiling with CONFIG_DRM_AMD_DC_PRE_VEGA I get a
kernel Oops when connecting the HDMI cable, see the attached log.

But (good news) if I revert
https://cgit.freedesktop.org/~agd5f/linux/commit/?id=8f5ed2ed31944eea5c2746ec66417afac043eabd
I have no kernel Oops and HDMI works fine. So something is definitely wrong
with that commit.

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[Bug 103080] DC driver from drm-next-4.15-dc branch (upstream PR) not working

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https://bugs.freedesktop.org/show_bug.cgi?id=103080

--- Comment #3 from Harry Wentland <harry.wentland@amd.com> ---
We've got a fix incoming in a day or two for that kernel oops with the next set
of DC patches.

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[Bug 103080] DC driver from drm-next-4.15-dc branch (upstream PR) not working

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https://bugs.freedesktop.org/show_bug.cgi?id=103080

--- Comment #4 from Carlo Caione <carlo@caione.org> ---
Great, thank you.

Any special reason why you decided to disable the DC support for pre-VEGA
ASICs?

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[Bug 103080] DC driver from drm-next-4.15-dc branch (upstream PR) not working

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https://bugs.freedesktop.org/show_bug.cgi?id=103080

--- Comment #5 from Harry Wentland <harry.wentland@amd.com> ---
We want to avoid any regression since pre-Vega is already supported by non-DC.
Generally I have a lot more faith in DC but there could always be corner cases.
Vega is a new ASIC so by definition there won't be regressions (unless we mess
with non-display stuff).

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[Bug 103080] DC driver from drm-next-4.15-dc branch (upstream PR) not working

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https://bugs.freedesktop.org/show_bug.cgi?id=103080

--- Comment #6 from Daniel Drake <dan@reactivated.net> ---
Harry, HDMI audio is not working for us on the non-DC driver on this hardware
(AMD A10-9620P RADEON R5, 10 COMPUTE CORES 4C+6G). Are you saying non-DC should
be working fine there?

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[Bug 103080] DC driver from drm-next-4.15-dc branch (upstream PR) not working

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https://bugs.freedesktop.org/show_bug.cgi?id=103080

--- Comment #7 from Dave Airlie <airlied@freedesktop.org> ---
Daniel,

not working HDMI audio is a missing feature, not a regression. Not enabling dc
by default on older GPUs is to avoid regressions in working features. After
some testing it will get enabled.

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[Bug 103080] DC driver from drm-next-4.15-dc branch (upstream PR) not working

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https://bugs.freedesktop.org/show_bug.cgi?id=103080

--- Comment #8 from Daniel Drake <dan@reactivated.net> ---
Got it. We have a number of affected systems here, so we will help with testing
efforts, reporting bugs and successes.

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[Bug 103080] DC driver from drm-next-4.15-dc branch (upstream PR) not working

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https://bugs.freedesktop.org/show_bug.cgi?id=103080

Martin Peres <martin.peres@free.fr> changed:

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

--- Comment #9 from Martin Peres <martin.peres@free.fr> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
closed from further activity.

You can subscribe and participate further through the new bug through this link
to our GitLab instance: https://gitlab.freedesktop.org/drm/amd/issues/242.

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