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drm/nva3/pm: introduce more paranoia 

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Ben Skeggs 2011-12-17 14:02:51 +10:00
parent 41ceeeb25d
commit 074e747a6d
1 changed files with 10 additions and 5 deletions
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15
drivers/gpu/drm/nouveau/nva3_pm.c
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@ -98,7 +98,9 @@ read_pll(struct drm_device *dev, int clk, u32 pll)
sclk = read_clk(dev, 0x10 + clk, false);
}
return sclk * N / (M * P);
if (M * P)
return sclk * N / (M * P);
return 0;
}
struct creg {
@ -182,23 +184,26 @@ prog_pll(struct drm_device *dev, int clk, u32 pll, struct creg *reg)
const u32 src1 = 0x004160 + (clk * 4);
const u32 ctrl = pll + 0;
const u32 coef = pll + 4;
u32 cntl;
if (!reg->clk && !reg->pll) {
NV_DEBUG(dev, "no clock for %02x\n", clk);
return;
}
cntl = nv_rd32(dev, ctrl) & 0xfffffff2;
if (reg->pll) {
nv_mask(dev, src0, 0x00000101, 0x00000101);
nv_wr32(dev, coef, reg->pll);
nv_wr32(dev, ctrl, cntl | 0x00000015);
nv_mask(dev, ctrl, 0x00000015, 0x00000015);
nv_mask(dev, ctrl, 0x00000010, 0x00000000);
nv_wait(dev, ctrl, 0x00020000, 0x00020000);
nv_mask(dev, ctrl, 0x00000010, 0x00000010);
nv_mask(dev, ctrl, 0x00000008, 0x00000000);
nv_mask(dev, src1, 0x00000100, 0x00000000);
nv_mask(dev, src1, 0x00000001, 0x00000000);
} else {
nv_mask(dev, src1, 0x003f3141, 0x00000101 | reg->clk);
nv_wr32(dev, ctrl, cntl | 0x0000001d);
nv_mask(dev, ctrl, 0x00000018, 0x00000018);
udelay(20);
nv_mask(dev, ctrl, 0x00000001, 0x00000000);
nv_mask(dev, src0, 0x00000100, 0x00000000);
nv_mask(dev, src0, 0x00000001, 0x00000000);