drm/nouveau/fb/ramnv50: Deal with cards without timing entries

Like Pierre's G94. We might want to structure Kepler similarly in a follow-up.
Signed-off-by: Roy Spliet <rspliet@eclipso.eu>
Tested-by: Pierre Moreau <pierre.morrow@free.fr>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/nvkm/subdev/fb/gddr3.c

@@ -63,7 +63,7 @@ ramgddr3_wr_lo[] = {
 	{ 5, 2 }, { 7, 4 }, { 8, 5 }, { 9, 6 }, { 10, 7 },
 	{ 11, 0 }, { 13 , 1 },
 	/* the below are mentioned in some, but not all, gddr3 docs */
-	{ 4, 1 }, { 6, 3 }, { 12, 1 },
+	{ 4, 0 }, { 6, 3 }, { 12, 1 },
 	{ -1 }
 };
 
@@ -87,15 +87,17 @@ nvkm_gddr3_calc(struct nvkm_ram *ram)
 		WR  = (ram->next->bios.timing[2] & 0x007f0000) >> 16;
 		/* XXX: Get these values from the VBIOS instead */
 		DLL = !(ram->mr[1] & 0x1);
-		ODT =  (ram->mr[1] & 0x004) >> 2 |
-		       (ram->mr[1] & 0x040) >> 5 |
-		       (ram->mr[1] & 0x200) >> 7;
 		RON = !(ram->mr[1] & 0x300) >> 8;
 		break;
 	default:
 		return -ENOSYS;
 	}
 
+	if (ram->next->bios.timing_ver == 0x20 ||
+	    ram->next->bios.ramcfg_timing == 0xff) {
+		ODT =  (ram->mr[1] & 0xc) >> 2;
+	}
+
 	hi = ram->mr[2] & 0x1;
 	CL  = ramxlat(hi ? ramgddr3_cl_hi : ramgddr3_cl_lo, CL);
 	WR  = ramxlat(ramgddr3_wr_lo, WR);

drivers/gpu/drm/nouveau/nvkm/subdev/fb/ramnv50.c

@@ -146,6 +146,38 @@ nv50_ram_timing_calc(struct nv50_ram *ram, u32 *timing)
 	nvkm_debug(subdev, " 240: %08x\n", timing[8]);
 	return 0;
 }
+
+static int
+nv50_ram_timing_read(struct nv50_ram *ram, u32 *timing)
+{
+	unsigned int i;
+	struct nvbios_ramcfg *cfg = &ram->base.target.bios;
+	struct nvkm_subdev *subdev = &ram->base.fb->subdev;
+	struct nvkm_device *device = subdev->device;
+
+	for (i = 0; i <= 8; i++)
+		timing[i] = nvkm_rd32(device, 0x100220 + (i * 4));
+
+	/* Derive the bare minimum for the MR calculation to succeed */
+	cfg->timing_ver = 0x10;
+	T(CL) = (timing[3] & 0xff) + 1;
+
+	switch (ram->base.type) {
+	case NVKM_RAM_TYPE_DDR2:
+		T(CWL) = T(CL) - 1;
+		break;
+	case NVKM_RAM_TYPE_GDDR3:
+		T(CWL) = ((timing[2] & 0xff000000) >> 24) + 1;
+		break;
+	default:
+		return -ENOSYS;
+		break;
+	}
+
+	T(WR) = ((timing[1] >> 24) & 0xff) - 1 - T(CWL);
+
+	return 0;
+}
 #undef T
 
 static void
@@ -242,10 +274,11 @@ nv50_ram_calc(struct nvkm_ram *base, u32 freq)
 				 strap, data, ver, hdr);
 			return -EINVAL;
 		}
+		nv50_ram_timing_calc(ram, timing);
+	} else {
+		nv50_ram_timing_read(ram, timing);
 	}
 
-	nv50_ram_timing_calc(ram, timing);
-
 	ret = ram_init(hwsq, subdev);
 	if (ret)
 		return ret;
@@ -264,8 +297,10 @@ nv50_ram_calc(struct nvkm_ram *base, u32 freq)
 		break;
 	}
 
-	if (ret)
+	if (ret) {
+		nvkm_error(subdev, "Could not calculate MR\n");
 		return ret;
+	}
 
 	/* Always disable this bit during reclock */
 	ram_mask(hwsq, 0x100200, 0x00000800, 0x00000000);

drivers/gpu/drm/nouveau/nvkm/subdev/fb/sddr2.c

@@ -76,6 +76,12 @@ nvkm_sddr2_calc(struct nvkm_ram *ram)
 		return -ENOSYS;
 	}
 
+	if (ram->next->bios.timing_ver == 0x20 ||
+	    ram->next->bios.ramcfg_timing == 0xff) {
+		ODT =  (ram->mr[1] & 0x004) >> 2 |
+		       (ram->mr[1] & 0x040) >> 5;
+	}
+
 	CL  = ramxlat(ramddr2_cl, CL);
 	WR  = ramxlat(ramddr2_wr, WR);
 	if (CL < 0 || WR < 0)