Ben Skeggs | e9ebb68 | 2010-04-28 14:07:06 +1000 | [diff] [blame] | 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 | |
| 25 | #include "drmP.h" |
Ben Skeggs | e9ebb68 | 2010-04-28 14:07:06 +1000 | [diff] [blame] | 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 |
Ben Skeggs | 52eba8d | 2011-04-28 02:34:21 +1000 | [diff] [blame^] | 49 | nva3_calc_pll(struct drm_device *dev, struct pll_lims *pll, int clk, |
| 50 | int *pN, int *pfN, int *pM, int *P) |
Ben Skeggs | e9ebb68 | 2010-04-28 14:07:06 +1000 | [diff] [blame] | 51 | { |
Ben Skeggs | 52eba8d | 2011-04-28 02:34:21 +1000 | [diff] [blame^] | 52 | u32 best_err = ~0, err; |
| 53 | int M, lM, hM, N, fN; |
Ben Skeggs | e9ebb68 | 2010-04-28 14:07:06 +1000 | [diff] [blame] | 54 | |
Ben Skeggs | 52eba8d | 2011-04-28 02:34:21 +1000 | [diff] [blame^] | 55 | *P = pll->vco1.maxfreq / clk; |
Ben Skeggs | e9ebb68 | 2010-04-28 14:07:06 +1000 | [diff] [blame] | 56 | if (*P > pll->max_p) |
| 57 | *P = pll->max_p; |
| 58 | if (*P < pll->min_p) |
| 59 | *P = pll->min_p; |
| 60 | |
Ben Skeggs | 52eba8d | 2011-04-28 02:34:21 +1000 | [diff] [blame^] | 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); |
Ben Skeggs | e9ebb68 | 2010-04-28 14:07:06 +1000 | [diff] [blame] | 65 | |
Ben Skeggs | 52eba8d | 2011-04-28 02:34:21 +1000 | [diff] [blame^] | 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++; |
Ben Skeggs | e9ebb68 | 2010-04-28 14:07:06 +1000 | [diff] [blame] | 72 | |
Ben Skeggs | 52eba8d | 2011-04-28 02:34:21 +1000 | [diff] [blame^] | 73 | if (N < pll->vco1.min_n) |
| 74 | continue; |
| 75 | if (N > pll->vco1.max_n) |
| 76 | break; |
Ben Skeggs | e9ebb68 | 2010-04-28 14:07:06 +1000 | [diff] [blame] | 77 | |
Ben Skeggs | 52eba8d | 2011-04-28 02:34:21 +1000 | [diff] [blame^] | 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 | } |
Ben Skeggs | e9ebb68 | 2010-04-28 14:07:06 +1000 | [diff] [blame] | 84 | |
Ben Skeggs | 52eba8d | 2011-04-28 02:34:21 +1000 | [diff] [blame^] | 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; |
Ben Skeggs | e9ebb68 | 2010-04-28 14:07:06 +1000 | [diff] [blame] | 97 | } |