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drm/nv50: add memory type detection 

DDR1/DDR[23] confirmed on NVA8 (see note about DDR3 in source) by changing
the value and watching the binary driver's behaviour.

GDDR3/4 values confirmed on a NV96 via the same method above.  That GDDR4
is present is interesting, as far as I can see no boards using it were ever
released.

GDDR5 value is based on VBIOS images of known GDDR5 boards.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Ben Skeggs 2011-12-13 09:45:25 +10:00
parent ff92a6cda7
commit 1072856a1c
1 changed files with 16 additions and 0 deletions
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16
drivers/gpu/drm/nouveau/nv50_vram.c
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@ -189,8 +189,24 @@ nv50_vram_init(struct drm_device *dev)
struct nouveau_vram_engine *vram = &dev_priv->engine.vram;
const u32 rsvd_head = ( 256 * 1024) >> 12; /* vga memory */
const u32 rsvd_tail = (1024 * 1024) >> 12; /* vbios etc */
u32 pfb714 = nv_rd32(dev, 0x100714);
u32 rblock, length;
switch (pfb714 & 0x00000007) {
case 0: dev_priv->vram_type = NV_MEM_TYPE_DDR1; break;
case 1:
if (0 /* some currently unknown condition */)
dev_priv->vram_type = NV_MEM_TYPE_DDR2;
else
dev_priv->vram_type = NV_MEM_TYPE_DDR3;
break;
case 2: dev_priv->vram_type = NV_MEM_TYPE_GDDR3; break;
case 3: dev_priv->vram_type = NV_MEM_TYPE_GDDR4; break;
case 4: dev_priv->vram_type = NV_MEM_TYPE_GDDR5; break;
default:
break;
}
dev_priv->vram_size = nv_rd32(dev, 0x10020c);
dev_priv->vram_size |= (dev_priv->vram_size & 0xff) << 32;
dev_priv->vram_size &= 0xffffffff00ULL;