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    SubjectRe: nouveau: failed to initialise sync
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    Thanks Christian,

    That patch fixed it for me, so I guess it just hasn't quite made it upstream
    yet.

    - Alistair

    On Tuesday, 6 July 2021 4:58:37 PM AEST Christian König wrote:
    > Hi guys,
    >
    > yes nouveau was using the same functionality for internal BOs without
    > noticing it. This is fixes by the following commit:
    >
    > commit d098775ed44021293b1962dea61efb19297b8d02
    > Author: Christian König <christian.koenig@amd.com>
    > Date: Wed Jun 9 19:25:56 2021 +0200
    >
    > drm/nouveau: init the base GEM fields for internal BOs
    >
    > TTMs buffer objects are based on GEM objects for quite a while
    > and rely on initializing those fields before initializing the TTM BO.
    >
    > Nouveau now doesn't init the GEM object for internally allocated BOs,
    > so make sure that we at least initialize some necessary fields.
    >
    > Could be that the patch needs to be send to stable as well.
    >
    > Regards,
    > Christian.
    >
    > Am 06.07.21 um 04:44 schrieb Alistair Popple:
    > > I am also hitting this with upstream. Reverting d02117f8efaa ("drm/ttm: remove
    > > special handling for non GEM drivers") also fixed it for me.
    > >
    > > The change log for that commit reads:
    > >
    > > drm/ttm: remove special handling for non GEM drivers
    > >
    > > vmwgfx is the only driver actually using this. Move the handling into
    > > the driver instead.
    > >
    > > I wonder if Nouveau might actually have been using this somehow too?
    > >
    > > - Alistair
    > >
    > > On Sunday, 4 July 2021 5:21:29 AM AEST Corentin Labbe wrote:
    > >> Hello
    > >>
    > >> Since some days on next, nouveau fail to load:
    > >> [ 2.754087] nouveau 0000:02:00.0: vgaarb: deactivate vga console
    > >> [ 2.761260] Console: switching to colour dummy device 80x25
    > >> [ 2.766888] nouveau 0000:02:00.0: NVIDIA MCP77/MCP78 (0aa480a2)
    > >> [ 2.783954] nouveau 0000:02:00.0: bios: version 62.77.2a.00.04
    > >> [ 2.810122] nouveau 0000:02:00.0: fb: 256 MiB stolen system memory
    > >> [ 3.484031] nouveau 0000:02:00.0: DRM: VRAM: 256 MiB
    > >> [ 3.488993] nouveau 0000:02:00.0: DRM: GART: 1048576 MiB
    > >> [ 3.494308] nouveau 0000:02:00.0: DRM: TMDS table version 2.0
    > >> [ 3.500052] nouveau 0000:02:00.0: DRM: DCB version 4.0
    > >> [ 3.505192] nouveau 0000:02:00.0: DRM: DCB outp 00: 01000300 0000001e
    > >> [ 3.511632] nouveau 0000:02:00.0: DRM: DCB outp 01: 01011332 00020010
    > >> [ 3.518074] nouveau 0000:02:00.0: DRM: DCB conn 00: 00000100
    > >> [ 3.523728] nouveau 0000:02:00.0: DRM: DCB conn 01: 00001261
    > >> [ 3.529455] nouveau 0000:02:00.0: DRM: failed to initialise sync
    > > subsystem, -28
    > >> [ 3.545946] nouveau: probe of 0000:02:00.0 failed with error -28
    > >>
    > >> I bisected it to:
    > >> git bisect start
    > >> # good: [62fb9874f5da54fdb243003b386128037319b219] Linux 5.13
    > >> git bisect good 62fb9874f5da54fdb243003b386128037319b219
    > >> # bad: [fb0ca446157a86b75502c1636b0d81e642fe6bf1] Add linux-next specific
    > > files for 20210701
    > >> git bisect bad fb0ca446157a86b75502c1636b0d81e642fe6bf1
    > >> # good: [f63c4fda987a19b1194cc45cb72fd5bf968d9d90] Merge remote-tracking
    > > branch 'rdma/for-next'
    > >> git bisect good f63c4fda987a19b1194cc45cb72fd5bf968d9d90
    > >> # bad: [49c8769be0b910d4134eba07cae5d9c71b861c4a] Merge remote-tracking
    > > branch 'drm/drm-next'
    > >> git bisect bad 49c8769be0b910d4134eba07cae5d9c71b861c4a
    > >> # good: [4e3db44a242a4e2afe33b59793898ecbb61d478e] Merge tag 'wireless-
    > > drivers-next-2021-06-25' of git://git.kernel.org/pub/scm/linux/kernel/git/
    > > kvalo/wireless-drivers-next
    > >> git bisect good 4e3db44a242a4e2afe33b59793898ecbb61d478e
    > >> # bad: [5745d647d5563d3e9d32013ad4e5c629acff04d7] Merge tag 'amd-drm-
    > > next-5.14-2021-06-02' of https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgitlab.freedesktop.org%2Fagd5f%2Flinux&amp;data=04%7C01%7Cchristian.koenig%40amd.com%7C5f05fa59cd3b4432e71108d94027ede6%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637611362989756089%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&amp;sdata=gJ98NtSRf3IyVfsCzw3DKydeMTGKIkHJNzUUhUfsWzY%3D&amp;reserved=0 into drm-
    > > next
    > >> git bisect bad 5745d647d5563d3e9d32013ad4e5c629acff04d7
    > >> # bad: [c99c4d0ca57c978dcc2a2f41ab8449684ea154cc] Merge tag 'amd-drm-
    > > next-5.14-2021-05-19' of https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgitlab.freedesktop.org%2Fagd5f%2Flinux&amp;data=04%7C01%7Cchristian.koenig%40amd.com%7C5f05fa59cd3b4432e71108d94027ede6%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637611362989756089%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&amp;sdata=gJ98NtSRf3IyVfsCzw3DKydeMTGKIkHJNzUUhUfsWzY%3D&amp;reserved=0 into drm-
    > > next
    > >> git bisect bad c99c4d0ca57c978dcc2a2f41ab8449684ea154cc
    > >> # bad: [ae25ec2fc6c5a9e5767bf1922cd648501d0f914c] Merge tag 'drm-misc-
    > > next-2021-05-17' of git://anongit.freedesktop.org/drm/drm-misc into drm-next
    > >> git bisect bad ae25ec2fc6c5a9e5767bf1922cd648501d0f914c
    > >> # bad: [cac80e71cfb0b00202d743c6e90333c45ba77cc5] drm/vkms: rename cursor to
    > > plane on ops of planes composition
    > >> git bisect bad cac80e71cfb0b00202d743c6e90333c45ba77cc5
    > >> # good: [178bdba84c5f0ad14de384fc7f15fba0e272919d] drm/ttm/ttm_device:
    > > Demote kernel-doc abuses
    > >> git bisect good 178bdba84c5f0ad14de384fc7f15fba0e272919d
    > >> # bad: [3f3a6524f6065fd3d130515e012f63eac74d96da] drm/dp: Clarify DP AUX
    > > registration time
    > >> git bisect bad 3f3a6524f6065fd3d130515e012f63eac74d96da
    > >> # bad: [6dd7efc437611db16d432e0030f72d0c7e890127] drm/gud: cleanup coding
    > > style a bit
    > >> git bisect bad 6dd7efc437611db16d432e0030f72d0c7e890127
    > >> # bad: [13b29cc3a722c2c0bc9ab9f72f9047d55d08a2f9] drm/mxsfb: Don't select
    > > DRM_KMS_FB_HELPER
    > >> git bisect bad 13b29cc3a722c2c0bc9ab9f72f9047d55d08a2f9
    > >> # bad: [d02117f8efaa5fbc37437df1ae955a147a2a424a] drm/ttm: remove special
    > > handling for non GEM drivers
    > >> git bisect bad d02117f8efaa5fbc37437df1ae955a147a2a424a
    > >> # good: [13ea9aa1e7d891e950230e82f1dd2c84e5debcff] drm/ttm: fix error
    > > handling if no BO can be swapped out v4
    > >> git bisect good 13ea9aa1e7d891e950230e82f1dd2c84e5debcff
    > >> # first bad commit: [d02117f8efaa5fbc37437df1ae955a147a2a424a] drm/ttm:
    > > remove special handling for non GEM drivers
    > >> Reverting the patch permit to have nouveau works again.
    > >>
    > >> Regards
    > >>
    > >>
    > >
    > >
    > >
    >
    >




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