drm/nv20-nv40: add memory type detection
NV20/NV30 is partially educated guesswork at this point, based on any
information around about available memory types and a horribly unspeakable
amount of vbios image scouring. I'm not entirely certain the GDDR3 define
is correct, I have not spotted a single vbios with that value yet (though
it is mentioned in some 1218-using nv4x vbios), but there are reports that
some nv3x did use it..
NV40(100914) confirmed by switching an NV49 to DDR1/DDR2 values and making
sure that the binary driver behaviour showed it had detected DDR1/DDR2
instead of GDDR3 before dying horribly.
NV40(100474) confirmed by doing much the same task as above on an NV44,
except this was *much* easier as changing the values didn't seem to have
any noticable effect on the memory controller aside from changing the
binary driver's behaviour.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/nv40_fb.c b/drivers/gpu/drm/nouveau/nv40_fb.c
index f0ac2a7..7fbcb33 100644
--- a/drivers/gpu/drm/nouveau/nv40_fb.c
+++ b/drivers/gpu/drm/nouveau/nv40_fb.c
@@ -72,6 +72,51 @@
}
int
+nv40_fb_vram_init(struct drm_device *dev)
+{
+ struct drm_nouveau_private *dev_priv = dev->dev_private;
+
+ /* 0x001218 is actually present on a few other NV4X I looked at,
+ * and even contains sane values matching 0x100474. From looking
+ * at various vbios images however, this isn't the case everywhere.
+ * So, I chose to use the same regs I've seen NVIDIA reading around
+ * the memory detection, hopefully that'll get us the right numbers
+ */
+ if (dev_priv->chipset == 0x40) {
+ u32 pbus1218 = nv_rd32(dev, 0x001218);
+ switch (pbus1218 & 0x00000300) {
+ case 0x00000000: dev_priv->vram_type = NV_MEM_TYPE_SDRAM; break;
+ case 0x00000100: dev_priv->vram_type = NV_MEM_TYPE_DDR1; break;
+ case 0x00000200: dev_priv->vram_type = NV_MEM_TYPE_GDDR3; break;
+ case 0x00000300: dev_priv->vram_type = NV_MEM_TYPE_DDR2; break;
+ }
+ } else
+ if (dev_priv->chipset == 0x49 || dev_priv->chipset == 0x4b) {
+ u32 pfb914 = nv_rd32(dev, 0x100914);
+ switch (pfb914 & 0x00000003) {
+ case 0x00000000: dev_priv->vram_type = NV_MEM_TYPE_DDR1; break;
+ case 0x00000001: dev_priv->vram_type = NV_MEM_TYPE_DDR2; break;
+ case 0x00000002: dev_priv->vram_type = NV_MEM_TYPE_GDDR3; break;
+ case 0x00000003: break;
+ }
+ } else
+ if (dev_priv->chipset != 0x4e) {
+ u32 pfb474 = nv_rd32(dev, 0x100474);
+ if (pfb474 & 0x00000004)
+ dev_priv->vram_type = NV_MEM_TYPE_GDDR3;
+ if (pfb474 & 0x00000002)
+ dev_priv->vram_type = NV_MEM_TYPE_DDR2;
+ if (pfb474 & 0x00000001)
+ dev_priv->vram_type = NV_MEM_TYPE_DDR1;
+ } else {
+ dev_priv->vram_type = NV_MEM_TYPE_STOLEN;
+ }
+
+ dev_priv->vram_size = nv_rd32(dev, 0x10020c) & 0xff000000;
+ return 0;
+}
+
+int
nv40_fb_init(struct drm_device *dev)
{
struct drm_nouveau_private *dev_priv = dev->dev_private;