diff options
Diffstat (limited to 'shared-core/nouveau_mem.c')
| -rw-r--r-- | shared-core/nouveau_mem.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/shared-core/nouveau_mem.c b/shared-core/nouveau_mem.c index 80b2990d..4e80ca46 100644 --- a/shared-core/nouveau_mem.c +++ b/shared-core/nouveau_mem.c @@ -300,6 +300,32 @@ uint64_t nouveau_mem_fb_amount(struct drm_device *dev) return 0; } +static void nouveau_mem_reset_agp(struct drm_device *dev) +{ + struct drm_nouveau_private *dev_priv = dev->dev_private; + uint32_t saved_pci_nv_1, saved_pci_nv_19, pmc_enable; + + saved_pci_nv_1 = NV_READ(NV04_PBUS_PCI_NV_1); + saved_pci_nv_19 = NV_READ(NV04_PBUS_PCI_NV_19); + + /* clear busmaster bit */ + NV_WRITE(NV04_PBUS_PCI_NV_1, saved_pci_nv_1 & ~0x4); + /* clear SBA and AGP bits */ + NV_WRITE(NV04_PBUS_PCI_NV_19, saved_pci_nv_19 & 0xfffff0ff); + + /* power cycle pgraph, if enabled */ + pmc_enable = NV_READ(NV03_PMC_ENABLE); + if (pmc_enable & NV_PMC_ENABLE_PGRAPH) { + NV_WRITE(NV03_PMC_ENABLE, pmc_enable & ~NV_PMC_ENABLE_PGRAPH); + NV_WRITE(NV03_PMC_ENABLE, NV_READ(NV03_PMC_ENABLE) | + NV_PMC_ENABLE_PGRAPH); + } + + /* and restore (gives effect of resetting AGP) */ + NV_WRITE(NV04_PBUS_PCI_NV_19, saved_pci_nv_19); + NV_WRITE(NV04_PBUS_PCI_NV_1, saved_pci_nv_1); +} + static int nouveau_mem_init_agp(struct drm_device *dev, int ttm) { @@ -308,6 +334,8 @@ nouveau_mem_init_agp(struct drm_device *dev, int ttm) struct drm_agp_mode mode; int ret; + nouveau_mem_reset_agp(dev); + ret = drm_agp_acquire(dev); if (ret) { DRM_ERROR("Unable to acquire AGP: %d\n", ret); |