drm/nouveau/gr/gf100-: virtualise patch_ltc, noting missing init

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/nvkm/engine/gr/ctxgf100.c

@@ -1254,6 +1254,8 @@ gf100_grctx_generate_main(struct gf100_gr *gr, struct gf100_grctx *info)
 	grctx->bundle(info);
 	grctx->pagepool(info);
 	grctx->attrib(info);
+	if (grctx->patch_ltc)
+		grctx->patch_ltc(info);
 	grctx->unkn(gr);
 
 	gf100_grctx_generate_tpcid(gr);

drivers/gpu/drm/nouveau/nvkm/engine/gr/ctxgf100.h

@@ -48,6 +48,8 @@ struct gf100_grctx_func {
 	u32 attrib_nr;
 	u32 alpha_nr_max;
 	u32 alpha_nr;
+	/* other patch buffer stuff */
+	void (*patch_ltc)(struct gf100_grctx *);
 };
 
 extern const struct gf100_grctx_func gf100_grctx;
@@ -80,6 +82,7 @@ extern const struct gf100_grctx_func gk20a_grctx;
 void gk104_grctx_generate_main(struct gf100_gr *, struct gf100_grctx *);
 void gk104_grctx_generate_bundle(struct gf100_grctx *);
 void gk104_grctx_generate_pagepool(struct gf100_grctx *);
+void gk104_grctx_generate_patch_ltc(struct gf100_grctx *);
 void gk104_grctx_generate_unkn(struct gf100_gr *);
 void gk104_grctx_generate_r418bb8(struct gf100_gr *);
 

drivers/gpu/drm/nouveau/nvkm/engine/gr/ctxgk104.c

@@ -840,6 +840,17 @@ gk104_grctx_pack_ppc[] = {
  * PGRAPH context implementation
  ******************************************************************************/
 
+void
+gk104_grctx_generate_patch_ltc(struct gf100_grctx *info)
+{
+	struct nvkm_device *device = info->gr->base.engine.subdev.device;
+	u32 data0 = nvkm_rd32(device, 0x17e91c);
+	u32 data1 = nvkm_rd32(device, 0x17e920);
+	/*XXX: Figure out how to modify this correctly! */
+	mmio_wr32(info, 0x17e91c, data0);
+	mmio_wr32(info, 0x17e920, data1);
+}
+
 void
 gk104_grctx_generate_bundle(struct gf100_grctx *info)
 {
@@ -1005,4 +1016,5 @@ gk104_grctx = {
 	.attrib_nr = 0x218,
 	.alpha_nr_max = 0x7ff,
 	.alpha_nr = 0x648,
+	.patch_ltc = gk104_grctx_generate_patch_ltc,
 };

drivers/gpu/drm/nouveau/nvkm/engine/gr/ctxgk110.c

@@ -830,4 +830,5 @@ gk110_grctx = {
 	.attrib_nr = 0x218,
 	.alpha_nr_max = 0x7ff,
 	.alpha_nr = 0x648,
+	.patch_ltc = gk104_grctx_generate_patch_ltc,
 };

drivers/gpu/drm/nouveau/nvkm/engine/gr/ctxgk110b.c

@@ -91,4 +91,5 @@ gk110b_grctx = {
 	.attrib_nr = 0x218,
 	.alpha_nr_max = 0x7ff,
 	.alpha_nr = 0x648,
+	.patch_ltc = gk104_grctx_generate_patch_ltc,
 };

drivers/gpu/drm/nouveau/nvkm/engine/gr/ctxgk208.c

@@ -552,4 +552,5 @@ gk208_grctx = {
 	.attrib_nr = 0x218,
 	.alpha_nr_max = 0x7ff,
 	.alpha_nr = 0x648,
+	.patch_ltc = gk104_grctx_generate_patch_ltc,
 };