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1 | /* |
2 | * Copyright 2010 Red Hat Inc. | |
3 | * | |
4 | * Permission is hereby granted, free of charge, to any person obtaining a | |
5 | * copy of this software and associated documentation files (the "Software"), | |
6 | * to deal in the Software without restriction, including without limitation | |
7 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
8 | * and/or sell copies of the Software, and to permit persons to whom the | |
9 | * Software is furnished to do so, subject to the following conditions: | |
10 | * | |
11 | * The above copyright notice and this permission notice shall be included in | |
12 | * all copies or substantial portions of the Software. | |
13 | * | |
14 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
15 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
16 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
17 | * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR | |
18 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, | |
19 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR | |
20 | * OTHER DEALINGS IN THE SOFTWARE. | |
21 | * | |
22 | * Authors: Ben Skeggs | |
23 | */ | |
24 | ||
760285e7 | 25 | #include <drm/drmP.h> |
e9ebb68b BS |
26 | #include "nouveau_drv.h" |
27 | #include "nouveau_hw.h" | |
28 | ||
29 | int | |
30 | nv50_calc_pll(struct drm_device *dev, struct pll_lims *pll, int clk, | |
31 | int *N1, int *M1, int *N2, int *M2, int *P) | |
32 | { | |
33 | struct nouveau_pll_vals pll_vals; | |
34 | int ret; | |
35 | ||
36 | ret = nouveau_calc_pll_mnp(dev, pll, clk, &pll_vals); | |
37 | if (ret <= 0) | |
38 | return ret; | |
39 | ||
40 | *N1 = pll_vals.N1; | |
41 | *M1 = pll_vals.M1; | |
42 | *N2 = pll_vals.N2; | |
43 | *M2 = pll_vals.M2; | |
44 | *P = pll_vals.log2P; | |
45 | return ret; | |
46 | } | |
47 | ||
48 | int | |
52eba8dd BS |
49 | nva3_calc_pll(struct drm_device *dev, struct pll_lims *pll, int clk, |
50 | int *pN, int *pfN, int *pM, int *P) | |
e9ebb68b | 51 | { |
52eba8dd BS |
52 | u32 best_err = ~0, err; |
53 | int M, lM, hM, N, fN; | |
e9ebb68b | 54 | |
52eba8dd | 55 | *P = pll->vco1.maxfreq / clk; |
e9ebb68b BS |
56 | if (*P > pll->max_p) |
57 | *P = pll->max_p; | |
58 | if (*P < pll->min_p) | |
59 | *P = pll->min_p; | |
60 | ||
52eba8dd BS |
61 | lM = (pll->refclk + pll->vco1.max_inputfreq) / pll->vco1.max_inputfreq; |
62 | lM = max(lM, (int)pll->vco1.min_m); | |
63 | hM = (pll->refclk + pll->vco1.min_inputfreq) / pll->vco1.min_inputfreq; | |
64 | hM = min(hM, (int)pll->vco1.max_m); | |
e9ebb68b | 65 | |
52eba8dd BS |
66 | for (M = lM; M <= hM; M++) { |
67 | u32 tmp = clk * *P * M; | |
68 | N = tmp / pll->refclk; | |
69 | fN = tmp % pll->refclk; | |
70 | if (!pfN && fN >= pll->refclk / 2) | |
71 | N++; | |
e9ebb68b | 72 | |
52eba8dd BS |
73 | if (N < pll->vco1.min_n) |
74 | continue; | |
75 | if (N > pll->vco1.max_n) | |
76 | break; | |
e9ebb68b | 77 | |
52eba8dd BS |
78 | err = abs(clk - (pll->refclk * N / M / *P)); |
79 | if (err < best_err) { | |
80 | best_err = err; | |
81 | *pN = N; | |
82 | *pM = M; | |
83 | } | |
e9ebb68b | 84 | |
52eba8dd BS |
85 | if (pfN) { |
86 | *pfN = (((fN << 13) / pll->refclk) - 4096) & 0xffff; | |
87 | return clk; | |
88 | } | |
89 | } | |
90 | ||
91 | if (unlikely(best_err == ~0)) { | |
92 | NV_ERROR(dev, "unable to find matching pll values\n"); | |
93 | return -EINVAL; | |
94 | } | |
95 | ||
96 | return pll->refclk * *pN / *pM / *P; | |
e9ebb68b | 97 | } |