Commit ca386aa7 authored by Ben Skeggs's avatar Ben Skeggs
Browse files

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: default avatarBen Skeggs <bskeggs@redhat.com>
Tested-by: default avatarAlexander Kapshuk <alexander.kapshuk@gmail.com>
parent a9cfcfca

drivers/gpu/drm/nouveau/dispnv50/disp.c

+6 −0
Original line number Diff line number Diff line
@@ -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,