+static struct nouveau_pm_memtiming *
+nouveau_perf_timing(struct drm_device *dev, struct bit_entry *P,
+ u16 memclk, u8 *entry, u8 recordlen, u8 entries)
+{
+ struct drm_nouveau_private *dev_priv = dev->dev_private;
+ struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
+ struct nvbios *bios = &dev_priv->vbios;
+ u8 ramcfg;
+ int i;
+
+ /* perf v2 has a separate "timing map" table, we have to match
+ * the target memory clock to a specific entry, *then* use
+ * ramcfg to select the correct subentry
+ */
+ if (P->version == 2) {
+ u8 *tmap = ROMPTR(bios, P->data[4]);
+ if (!tmap) {
+ NV_DEBUG(dev, "no timing map pointer\n");
+ return NULL;
+ }
+
+ if (tmap[0] != 0x10) {
+ NV_WARN(dev, "timing map 0x%02x unknown\n", tmap[0]);
+ return NULL;
+ }
+
+ entry = tmap + tmap[1];
+ recordlen = tmap[2] + (tmap[4] * tmap[3]);
+ for (i = 0; i < tmap[5]; i++, entry += recordlen) {
+ if (memclk >= ROM16(entry[0]) &&
+ memclk <= ROM16(entry[2]))
+ break;
+ }
+
+ if (i == tmap[5]) {
+ NV_WARN(dev, "no match in timing map table\n");
+ return NULL;
+ }
+
+ entry += tmap[2];
+ recordlen = tmap[3];
+ entries = tmap[4];
+ }
+
+ ramcfg = (nv_rd32(dev, NV_PEXTDEV_BOOT_0) & 0x0000003c) >> 2;
+ if (bios->ram_restrict_tbl_ptr)
+ ramcfg = bios->data[bios->ram_restrict_tbl_ptr + ramcfg];
+
+ if (ramcfg >= entries) {
+ NV_WARN(dev, "ramcfg strap out of bounds!\n");
+ return NULL;
+ }
+
+ entry += ramcfg * recordlen;
+ if (entry[1] >= pm->memtimings.nr_timing) {
+ NV_WARN(dev, "timingset %d does not exist\n", entry[1]);
+ return NULL;
+ }
+
+ return &pm->memtimings.timing[entry[1]];
+}
+