From 70790f4f819875e8f390871fd15bbbf823f28e1b Mon Sep 17 00:00:00 2001 From: Ben Skeggs Date: Tue, 10 Jul 2012 17:26:46 +1000 Subject: drm/nouveau/clock: pull in the implementation from all over the place Still missing the main bits we use to change performance levels, I'll get to it after all the hard yakka has been finished. Signed-off-by: Ben Skeggs --- .../gpu/drm/nouveau/core/subdev/clock/pllnva3.c | 80 ++++++++++++++++++++++ 1 file changed, 80 insertions(+) create mode 100644 drivers/gpu/drm/nouveau/core/subdev/clock/pllnva3.c (limited to 'drivers/gpu/drm/nouveau/core/subdev/clock/pllnva3.c') diff --git a/drivers/gpu/drm/nouveau/core/subdev/clock/pllnva3.c b/drivers/gpu/drm/nouveau/core/subdev/clock/pllnva3.c new file mode 100644 index 0000000..eed5c16 --- /dev/null +++ b/drivers/gpu/drm/nouveau/core/subdev/clock/pllnva3.c @@ -0,0 +1,80 @@ +/* + * Copyright 2010 Red Hat Inc. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + * + * Authors: Ben Skeggs + */ + +#include +#include +#include + +#include "pll.h" + +int +nva3_pll_calc(struct nouveau_clock *clock, struct nvbios_pll *info, + u32 freq, int *pN, int *pfN, int *pM, int *P) +{ + u32 best_err = ~0, err; + int M, lM, hM, N, fN; + + *P = info->vco1.max_freq / freq; + if (*P > info->max_p) + *P = info->max_p; + if (*P < info->min_p) + *P = info->min_p; + + lM = (info->refclk + info->vco1.max_inputfreq) / info->vco1.max_inputfreq; + lM = max(lM, (int)info->vco1.min_m); + hM = (info->refclk + info->vco1.min_inputfreq) / info->vco1.min_inputfreq; + hM = min(hM, (int)info->vco1.max_m); + + for (M = lM; M <= hM; M++) { + u32 tmp = freq * *P * M; + N = tmp / info->refclk; + fN = tmp % info->refclk; + if (!pfN && fN >= info->refclk / 2) + N++; + + if (N < info->vco1.min_n) + continue; + if (N > info->vco1.max_n) + break; + + err = abs(freq - (info->refclk * N / M / *P)); + if (err < best_err) { + best_err = err; + *pN = N; + *pM = M; + } + + if (pfN) { + *pfN = (((fN << 13) / info->refclk) - 4096) & 0xffff; + return freq; + } + } + + if (unlikely(best_err == ~0)) { + nv_error(clock, "unable to find matching pll values\n"); + return -EINVAL; + } + + return info->refclk * *pN / *pM / *P; +} -- cgit v1.1