drm/nva3: support for memory timing map table

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

diff --git a/drivers/gpu/drm/nouveau/nouveau_perf.c b/drivers/gpu/drm/nouveau/nouveau_perf.c
index 5b87e68b00aeea839e9cdd9f98ebb699d18e1411..92431a07d9bc945732be02c4001432d988de1493 100644 (file)
--- a/drivers/gpu/drm/nouveau/nouveau_perf.c
+++ b/drivers/gpu/drm/nouveau/nouveau_perf.c
@@ -72,6 +72,66 @@ legacy_perf_init(struct drm_device *dev)
        pm->nr_perflvl = 1;
 }
 
+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;
+       ramcfg >>= 2;
+       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]];
+}
+
 void
 nouveau_perf_init(struct drm_device *dev)
 {
@@ -82,7 +142,6 @@ nouveau_perf_init(struct drm_device *dev)
        u8 version, headerlen, recordlen, entries;
        u8 *perf, *entry;
        int vid, i;
-       u8 ramcfg = (nv_rd32(dev, NV_PEXTDEV_BOOT_0) & 0x3c) >> 2;
 
        if (bios->type == NVBIOS_BIT) {
                if (bit_table(dev, 'P', &P))
@@ -194,19 +253,13 @@ nouveau_perf_init(struct drm_device *dev)
                }
 
                /* get the corresponding memory timings */
-               if (pm->memtimings.supported) {
-                       u8  timing_id = 0xff;
-                       u16 extra_data;
-
-                       if (version > 0x15 && version < 0x40 &&
-                           ramcfg < perf[4]) {
-                               extra_data = perf[3] + (ramcfg * perf[5]);
-                               timing_id  = entry[extra_data + 1];
-                       }
-
-                       if (pm->memtimings.nr_timing > timing_id)
-                               perflvl->timing =
-                                       &pm->memtimings.timing[timing_id];
+               if (pm->memtimings.supported && version > 0x15) {
+                       /* last 3 args are for < 0x40, ignored for >= 0x40 */
+                       perflvl->timing =
+                               nouveau_perf_timing(dev, &P,
+                                                   perflvl->memory / 1000,
+                                                   entry + perf[3],
+                                                   perf[5], perf[4]);
                }
 
                snprintf(perflvl->name, sizeof(perflvl->name),