diff options
Diffstat (limited to 'drivers/gpu/drm/nouveau/nouveau_calc.c')
| -rw-r--r-- | drivers/gpu/drm/nouveau/nouveau_calc.c | 216 |
1 files changed, 0 insertions, 216 deletions
diff --git a/drivers/gpu/drm/nouveau/nouveau_calc.c b/drivers/gpu/drm/nouveau/nouveau_calc.c index dad96cce5e39..5b487655d6b8 100644 --- a/drivers/gpu/drm/nouveau/nouveau_calc.c +++ b/drivers/gpu/drm/nouveau/nouveau_calc.c @@ -260,219 +260,3 @@ nouveau_calc_arb(struct drm_device *dev, int vclk, int bpp, int *burst, int *lwm } else nv20_update_arb(burst, lwm); } - -static int -getMNP_single(struct drm_device *dev, struct pll_lims *pll_lim, int clk, - struct nouveau_pll_vals *bestpv) -{ - /* Find M, N and P for a single stage PLL - * - * Note that some bioses (NV3x) have lookup tables of precomputed MNP - * values, but we're too lazy to use those atm - * - * "clk" parameter in kHz - * returns calculated clock - */ - struct drm_nouveau_private *dev_priv = dev->dev_private; - int cv = dev_priv->vbios.chip_version; - int minvco = pll_lim->vco1.minfreq, maxvco = pll_lim->vco1.maxfreq; - int minM = pll_lim->vco1.min_m, maxM = pll_lim->vco1.max_m; - int minN = pll_lim->vco1.min_n, maxN = pll_lim->vco1.max_n; - int minU = pll_lim->vco1.min_inputfreq; - int maxU = pll_lim->vco1.max_inputfreq; - int minP = pll_lim->max_p ? pll_lim->min_p : 0; - int maxP = pll_lim->max_p ? pll_lim->max_p : pll_lim->max_usable_log2p; - int crystal = pll_lim->refclk; - int M, N, thisP, P; - int clkP, calcclk; - int delta, bestdelta = INT_MAX; - int bestclk = 0; - - /* this division verified for nv20, nv18, nv28 (Haiku), and nv34 */ - /* possibly correlated with introduction of 27MHz crystal */ - if (dev_priv->card_type < NV_50) { - if (cv < 0x17 || cv == 0x1a || cv == 0x20) { - if (clk > 250000) - maxM = 6; - if (clk > 340000) - maxM = 2; - } else if (cv < 0x40) { - if (clk > 150000) - maxM = 6; - if (clk > 200000) - maxM = 4; - if (clk > 340000) - maxM = 2; - } - } - - P = pll_lim->max_p ? maxP : (1 << maxP); - if ((clk * P) < minvco) { - minvco = clk * maxP; - maxvco = minvco * 2; - } - - if (clk + clk/200 > maxvco) /* +0.5% */ - maxvco = clk + clk/200; - - /* NV34 goes maxlog2P->0, NV20 goes 0->maxlog2P */ - for (thisP = minP; thisP <= maxP; thisP++) { - P = pll_lim->max_p ? thisP : (1 << thisP); - clkP = clk * P; - - if (clkP < minvco) - continue; - if (clkP > maxvco) - return bestclk; - - for (M = minM; M <= maxM; M++) { - if (crystal/M < minU) - return bestclk; - if (crystal/M > maxU) - continue; - - /* add crystal/2 to round better */ - N = (clkP * M + crystal/2) / crystal; - - if (N < minN) - continue; - if (N > maxN) - break; - - /* more rounding additions */ - calcclk = ((N * crystal + P/2) / P + M/2) / M; - delta = abs(calcclk - clk); - /* we do an exhaustive search rather than terminating - * on an optimality condition... - */ - if (delta < bestdelta) { - bestdelta = delta; - bestclk = calcclk; - bestpv->N1 = N; - bestpv->M1 = M; - bestpv->log2P = thisP; - if (delta == 0) /* except this one */ - return bestclk; - } - } - } - - return bestclk; -} - -static int -getMNP_double(struct drm_device *dev, struct pll_lims *pll_lim, int clk, - struct nouveau_pll_vals *bestpv) -{ - /* Find M, N and P for a two stage PLL - * - * Note that some bioses (NV30+) have lookup tables of precomputed MNP - * values, but we're too lazy to use those atm - * - * "clk" parameter in kHz - * returns calculated clock - */ - struct drm_nouveau_private *dev_priv = dev->dev_private; - int chip_version = dev_priv->vbios.chip_version; - int minvco1 = pll_lim->vco1.minfreq, maxvco1 = pll_lim->vco1.maxfreq; - int minvco2 = pll_lim->vco2.minfreq, maxvco2 = pll_lim->vco2.maxfreq; - int minU1 = pll_lim->vco1.min_inputfreq, minU2 = pll_lim->vco2.min_inputfreq; - int maxU1 = pll_lim->vco1.max_inputfreq, maxU2 = pll_lim->vco2.max_inputfreq; - int minM1 = pll_lim->vco1.min_m, maxM1 = pll_lim->vco1.max_m; - int minN1 = pll_lim->vco1.min_n, maxN1 = pll_lim->vco1.max_n; - int minM2 = pll_lim->vco2.min_m, maxM2 = pll_lim->vco2.max_m; - int minN2 = pll_lim->vco2.min_n, maxN2 = pll_lim->vco2.max_n; - int maxlog2P = pll_lim->max_usable_log2p; - int crystal = pll_lim->refclk; - bool fixedgain2 = (minM2 == maxM2 && minN2 == maxN2); - int M1, N1, M2, N2, log2P; - int clkP, calcclk1, calcclk2, calcclkout; - int delta, bestdelta = INT_MAX; - int bestclk = 0; - - int vco2 = (maxvco2 - maxvco2/200) / 2; - for (log2P = 0; clk && log2P < maxlog2P && clk <= (vco2 >> log2P); log2P++) - ; - clkP = clk << log2P; - - if (maxvco2 < clk + clk/200) /* +0.5% */ - maxvco2 = clk + clk/200; - - for (M1 = minM1; M1 <= maxM1; M1++) { - if (crystal/M1 < minU1) - return bestclk; - if (crystal/M1 > maxU1) - continue; - - for (N1 = minN1; N1 <= maxN1; N1++) { - calcclk1 = crystal * N1 / M1; - if (calcclk1 < minvco1) - continue; - if (calcclk1 > maxvco1) - break; - - for (M2 = minM2; M2 <= maxM2; M2++) { - if (calcclk1/M2 < minU2) - break; - if (calcclk1/M2 > maxU2) - continue; - - /* add calcclk1/2 to round better */ - N2 = (clkP * M2 + calcclk1/2) / calcclk1; - if (N2 < minN2) - continue; - if (N2 > maxN2) - break; - - if (!fixedgain2) { - if (chip_version < 0x60) - if (N2/M2 < 4 || N2/M2 > 10) - continue; - - calcclk2 = calcclk1 * N2 / M2; - if (calcclk2 < minvco2) - break; - if (calcclk2 > maxvco2) - continue; - } else - calcclk2 = calcclk1; - - calcclkout = calcclk2 >> log2P; - delta = abs(calcclkout - clk); - /* we do an exhaustive search rather than terminating - * on an optimality condition... - */ - if (delta < bestdelta) { - bestdelta = delta; - bestclk = calcclkout; - bestpv->N1 = N1; - bestpv->M1 = M1; - bestpv->N2 = N2; - bestpv->M2 = M2; - bestpv->log2P = log2P; - if (delta == 0) /* except this one */ - return bestclk; - } - } - } - } - - return bestclk; -} - -int -nouveau_calc_pll_mnp(struct drm_device *dev, struct pll_lims *pll_lim, int clk, - struct nouveau_pll_vals *pv) -{ - int outclk; - - if (!pll_lim->vco2.maxfreq) - outclk = getMNP_single(dev, pll_lim, clk, pv); - else - outclk = getMNP_double(dev, pll_lim, clk, pv); - - if (!outclk) - NV_ERROR(dev, "Could not find a compatible set of PLL values\n"); - - return outclk; -} |