diff options
| author | Ben Skeggs <bskeggs@redhat.com> | 2011-07-21 15:39:06 +1000 |
|---|---|---|
| committer | Ben Skeggs <bskeggs@redhat.com> | 2011-09-20 16:08:41 +1000 |
| commit | f2cbe46f14427914bdd191795da998588dee4b8c (patch) | |
| tree | 8b638a05e106e851e89ceff3e1b748a18a214fc8 | |
| parent | 93e692dc5f4ad9153a34cfb4bd02144f4368151b (diff) | |
drm/nouveau: determine timing crystal freq from straps
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
| -rw-r--r-- | drivers/gpu/drm/nouveau/nouveau_drv.h | 1 | ||||
| -rw-r--r-- | drivers/gpu/drm/nouveau/nouveau_state.c | 19 |
2 files changed, 19 insertions, 1 deletions
diff --git a/drivers/gpu/drm/nouveau/nouveau_drv.h b/drivers/gpu/drm/nouveau/nouveau_drv.h index c5993aad2ae..92c414af207 100644 --- a/drivers/gpu/drm/nouveau/nouveau_drv.h +++ b/drivers/gpu/drm/nouveau/nouveau_drv.h @@ -680,6 +680,7 @@ struct drm_nouveau_private { /* exact chipset, derived from NV_PMC_BOOT_0 */ int chipset; int flags; + u32 crystal; void __iomem *mmio; diff --git a/drivers/gpu/drm/nouveau/nouveau_state.c b/drivers/gpu/drm/nouveau/nouveau_state.c index f1047254e82..baaecf10a58 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. |