diff options
| author | Ben Skeggs | 2011-07-21 07:39:06 +0200 |
|---|---|---|
| committer | Ben Skeggs | 2011-09-20 08:08:41 +0200 |
| commit | f2cbe46f14427914bdd191795da998588dee4b8c (patch) | |
| tree | 8b638a05e106e851e89ceff3e1b748a18a214fc8 /drivers/gpu/drm/nouveau/nouveau_state.c | |
| parent | drm/nva3/pm: pll disabled if bit 0 of ctrl not set (diff) | |
| download | kernel-qcow2-linux-f2cbe46f14427914bdd191795da998588dee4b8c.tar.gz kernel-qcow2-linux-f2cbe46f14427914bdd191795da998588dee4b8c.tar.xz kernel-qcow2-linux-f2cbe46f14427914bdd191795da998588dee4b8c.zip | |
drm/nouveau: determine timing crystal freq from straps
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Diffstat (limited to 'drivers/gpu/drm/nouveau/nouveau_state.c')
| -rw-r--r-- | drivers/gpu/drm/nouveau/nouveau_state.c | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/drivers/gpu/drm/nouveau/nouveau_state.c b/drivers/gpu/drm/nouveau/nouveau_state.c index f1047254e820..baaecf10a585 100644 --- a/drivers/gpu/drm/nouveau/nouveau_state.c +++ b/drivers/gpu/drm/nouveau/nouveau_state.c @@ -984,7 +984,7 @@ static int nouveau_remove_conflicting_drivers(struct drm_device *dev) int nouveau_load(struct drm_device *dev, unsigned long flags) { struct drm_nouveau_private *dev_priv; - uint32_t reg0; + uint32_t reg0, strap; resource_size_t mmio_start_offs; int ret; @@ -1074,6 +1074,23 @@ int nouveau_load(struct drm_device *dev, unsigned long flags) NV_INFO(dev, "Detected an NV%2x generation card (0x%08x)\n", dev_priv->card_type, reg0); + /* determine frequency of timing crystal */ + strap = nv_rd32(dev, 0x101000); + if ( dev_priv->chipset < 0x17 || + (dev_priv->chipset >= 0x20 && dev_priv->chipset <= 0x25)) + strap &= 0x00000040; + else + strap &= 0x00400040; + + switch (strap) { + case 0x00000000: dev_priv->crystal = 13500; break; + case 0x00000040: dev_priv->crystal = 14318; break; + case 0x00400000: dev_priv->crystal = 27000; break; + case 0x00400040: dev_priv->crystal = 25000; break; + } + + NV_DEBUG(dev, "crystal freq: %dKHz\n", dev_priv->crystal); + /* Determine whether we'll attempt acceleration or not, some * cards are disabled by default here due to them being known * non-functional, or never been tested due to lack of hw. |