From: Ben Skeggs <bskeggs@redhat.com>
Date: Tue, 8 May 2018 20:39:47 +1000
Subject: drm/nouveau/gr/gf100-: add missing reset sequence before golden
 context init
Git-commit: 74b6068bd660a806e801ae039dbab58dc284301e
Patch-mainline: v4.18-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

RM and NVGPU both have a variant of this, we probably should too.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/nouveau/nvkm/engine/gr/ctxgf100.c |   20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

--- a/drivers/gpu/drm/nouveau/nvkm/engine/gr/ctxgf100.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/gr/ctxgf100.c
@@ -1456,6 +1456,26 @@ gf100_grctx_generate(struct gf100_gr *gr
 	int ret, i;
 	u64 addr;
 
+	/* NV_PGRAPH_FE_PWR_MODE_FORCE_ON. */
+	nvkm_wr32(device, 0x404170, 0x00000012);
+	nvkm_msec(device, 2000,
+		if (!(nvkm_rd32(device, 0x404170) & 0x00000010))
+			break;
+	);
+
+	/* Reset FECS. */
+	nvkm_wr32(device, 0x409614, 0x00000070);
+	nvkm_usec(device, 10, NVKM_DELAY);
+	nvkm_mask(device, 0x409614, 0x00000700, 0x00000700);
+	nvkm_usec(device, 10, NVKM_DELAY);
+	nvkm_rd32(device, 0x409614);
+
+	/* NV_PGRAPH_FE_PWR_MODE_AUTO. */
+	nvkm_wr32(device, 0x404170, 0x00000010);
+
+	/* Init SCC RAM. */
+	nvkm_wr32(device, 0x40802c, 0x00000001);
+
 	/* Allocate memory to for a "channel", which we'll use to generate
 	 * the default context values.
 	 */