drm/nv50: support fractional feedback divider on newer chips
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/nv50_crtc.c b/drivers/gpu/drm/nouveau/nv50_crtc.c
index 41fe8ae..b4e4a3b 100644
--- a/drivers/gpu/drm/nouveau/nv50_crtc.c
+++ b/drivers/gpu/drm/nouveau/nv50_crtc.c
@@ -264,38 +264,40 @@
int
nv50_crtc_set_clock(struct drm_device *dev, int head, int pclk)
{
- uint32_t pll_reg = NV50_PDISPLAY_CRTC_CLK_CTRL1(head);
- struct nouveau_pll_vals pll;
- struct pll_lims limits;
+ uint32_t reg = NV50_PDISPLAY_CRTC_CLK_CTRL1(head);
+ struct pll_lims pll;
uint32_t reg1, reg2;
- int ret;
+ int ret, N1, M1, N2, M2, P;
- ret = get_pll_limits(dev, pll_reg, &limits);
+ ret = get_pll_limits(dev, reg, &pll);
if (ret)
return ret;
- ret = nouveau_calc_pll_mnp(dev, &limits, pclk, &pll);
- if (ret <= 0)
- return ret;
+ if (pll.vco2.maxfreq) {
+ ret = nv50_calc_pll(dev, &pll, pclk, &N1, &M1, &N2, &M2, &P);
+ if (ret <= 0)
+ return 0;
- if (limits.vco2.maxfreq) {
NV_DEBUG(dev, "pclk %d out %d NM1 %d %d NM2 %d %d P %d\n",
- pclk, ret, pll.N1, pll.M1, pll.N2, pll.M2, pll.log2P);
+ pclk, ret, N1, M1, N2, M2, P);
- reg1 = nv_rd32(dev, pll_reg + 4) & 0xff00ff00;
- reg2 = nv_rd32(dev, pll_reg + 8) & 0x8000ff00;
- nv_wr32(dev, pll_reg, 0x10000611);
- nv_wr32(dev, pll_reg + 4, reg1 | (pll.M1 << 16) | pll.N1);
- nv_wr32(dev, pll_reg + 8,
- reg2 | (pll.log2P << 28) | (pll.M2 << 16) | pll.N2);
+ reg1 = nv_rd32(dev, reg + 4) & 0xff00ff00;
+ reg2 = nv_rd32(dev, reg + 8) & 0x8000ff00;
+ nv_wr32(dev, reg, 0x10000611);
+ nv_wr32(dev, reg + 4, reg1 | (M1 << 16) | N1);
+ nv_wr32(dev, reg + 8, reg2 | (P << 28) | (M2 << 16) | N2);
} else {
- NV_DEBUG(dev, "pclk %d out %d NM %d %d P %d\n",
- pclk, ret, pll.N1, pll.M1, pll.log2P);
+ ret = nv50_calc_pll2(dev, &pll, pclk, &N1, &N2, &M1, &P);
+ if (ret <= 0)
+ return 0;
- reg1 = nv_rd32(dev, pll_reg + 4) & 0xffc00000;
- nv_wr32(dev, pll_reg, 0x50000610);
- nv_wr32(dev, pll_reg + 4, reg1 |
- (pll.log2P << 16) | (pll.M1 << 8) | pll.N1);
+ NV_DEBUG(dev, "pclk %d out %d N %d fN 0x%04x M %d P %d\n",
+ pclk, ret, N1, N2, M1, P);
+
+ reg1 = nv_rd32(dev, reg + 4) & 0xffc00000;
+ nv_wr32(dev, reg, 0x50000610);
+ nv_wr32(dev, reg + 4, reg1 | (P << 16) | (M1 << 8) | N1);
+ nv_wr32(dev, reg + 8, N2);
}
return 0;