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drm/nouveau/kms/nv50-gp1xx: add WAR for EVO push buffer HW bug

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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>
This commit is contained in:
Ben Skeggs 2020-09-02 15:30:33 +10:00
parent a9cfcfcad5
commit ca386aa715
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/nouveau/dispnv50/disp.c
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@ -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,