drm/nouveau/gsp/r570: Set GcOff = 0 in fbsr

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Previously, it looked as if we were able to fix suspend/resume on some
desktops by setting Gcoff based on whether or not we were entering runtime
PM. This was a mistake though - the only time suspend/resume would end up
actually working was if Gcoff = 0.

It seems like it's likely the main reason for this is the FBSR GcOff
argument actually controls GSP's behavior with regards to which buffers it
decides to save across suspend/resume. When GcOff = 1, RM reserved regions
are saved unless they are marked as LOST_ON_SUSPEND, and RM channel-context
and kernel-client buffers are also saved -including- when they are
LOST_ON_SUSPEND. This means with GcOff = 1, we end up having GSP save and
restore buffers that actually need to be reinitialized on resume - causing
the failures we're setting.

Thanks to John Hubbard from Nvidia for providing some background on what
these options do in the GSP firmware do!

Signed-off-by: Lyude Paul <lyude@redhat.com>
Fixes: 53dac06238 ("drm/nouveau/gsp: add support for 570.144")
Cc: <stable@vger.kernel.org> # v6.16+
Reviewed-by: Dave Airlie <airlied@redhat.com>
Link: https://patch.msgid.link/20260814194542.781955-3-lyude@redhat.com

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Lyude Paul 2026-08-14 15:43:49 -04:00

parent 94097122bf

commit c7abe771e0

1 changed files with 1 additions and 1 deletions

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drivers/gpu/drm/nouveau/nvkm/subdev/gsp/rm/r570/fbsr.c

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