diff options
| author | Ben Skeggs <bskeggs@redhat.com> | 2020-09-02 15:30:33 +1000 |
|---|---|---|
| committer | Ben Skeggs <bskeggs@redhat.com> | 2020-09-03 15:32:24 +1000 |
| commit | ca386aa7155a5467fa7b2b8376f4da8f8e59be4d (patch) | |
| tree | fb92f91a72c9111205013b164d2dca3123fe7e56 | |
| parent | a9cfcfcad50c7bf4ef7335a3eefba8d989d15c06 (diff) | |
| download | linux-ca386aa7155a5467fa7b2b8376f4da8f8e59be4d.tar.gz | |
drm/nouveau/kms/nv50-gp1xx: add WAR for EVO push buffer HW bug
Thanks to NVIDIA for confirming this workaround, and clarifying which HW
is affected.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Tested-by: Alexander Kapshuk <alexander.kapshuk@gmail.com>
| -rw-r--r-- | drivers/gpu/drm/nouveau/dispnv50/disp.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/dispnv50/disp.c b/drivers/gpu/drm/nouveau/dispnv50/disp.c index e7874877da8583..1ed24207000119 100644 --- a/drivers/gpu/drm/nouveau/dispnv50/disp.c +++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c @@ -257,6 +257,12 @@ nv50_dmac_create(struct nvif_device *device, struct nvif_object *disp, dmac->push->end = dmac->push->bgn; dmac->max = 0x1000/4 - 1; + /* EVO channels are affected by a HW bug where the last 12 DWORDs + * of the push buffer aren't able to be used safely. + */ + if (disp->oclass < GV100_DISP) + dmac->max -= 12; + args->pushbuf = nvif_handle(&dmac->_push.mem.object); ret = nv50_chan_create(device, disp, oclass, head, data, size, |