drm/nouveau/clk/gk20a: convert parameters to Khz
Perform computations in Khz instead of Mhz for better precision. Signed-off-by: Alexandre Courbot <acourbot@nvidia.com> Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
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@ -1,5 +1,5 @@
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/*
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* Copyright (c) 2014, NVIDIA CORPORATION. All rights reserved.
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* Copyright (c) 2014-2016, NVIDIA CORPORATION. All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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@ -28,7 +28,8 @@
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#include <core/tegra.h>
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#include <subdev/timer.h>
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#define MHZ (1000 * 1000)
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#define KHZ (1000)
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#define MHZ (KHZ * 1000)
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#define MASK(w) ((1 << w) - 1)
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@ -97,7 +98,7 @@ static const u8 pl_to_div[] = {
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/* p: */ 1, 2, 3, 4, 5, 6, 8, 10, 12, 16, 12, 16, 20, 24, 32,
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};
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/* All frequencies in Mhz */
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/* All frequencies in Khz */
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struct gk20a_clk_pllg_params {
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u32 min_vco, max_vco;
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u32 min_u, max_u;
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@ -107,8 +108,8 @@ struct gk20a_clk_pllg_params {
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};
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static const struct gk20a_clk_pllg_params gk20a_pllg_params = {
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.min_vco = 1000, .max_vco = 2064,
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.min_u = 12, .max_u = 38,
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.min_vco = 1000000, .max_vco = 2064000,
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.min_u = 12000, .max_u = 38000,
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.min_m = 1, .max_m = 255,
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.min_n = 8, .max_n = 255,
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.min_pl = 1, .max_pl = 32,
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@ -159,8 +160,8 @@ gk20a_pllg_calc_mnp(struct gk20a_clk *clk, unsigned long rate)
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u32 delta, lwv, best_delta = ~0;
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u32 pl;
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target_clk_f = rate * 2 / MHZ;
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ref_clk_f = clk->parent_rate / MHZ;
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target_clk_f = rate * 2 / KHZ;
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ref_clk_f = clk->parent_rate / KHZ;
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max_vco_f = clk->params->max_vco;
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min_vco_f = clk->params->min_vco;
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@ -249,17 +250,18 @@ found_match:
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if (best_delta != 0)
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nvkm_debug(subdev,
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"no best match for target @ %dMHz on gpc_pll",
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target_clk_f);
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target_clk_f / KHZ);
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clk->m = best_m;
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clk->n = best_n;
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clk->pl = best_pl;
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target_freq = gk20a_pllg_calc_rate(clk) / MHZ;
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target_freq = gk20a_pllg_calc_rate(clk);
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nvkm_debug(subdev,
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"actual target freq %d MHz, M %d, N %d, PL %d(div%d)\n",
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target_freq, clk->m, clk->n, clk->pl, pl_to_div[clk->pl]);
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target_freq / MHZ, clk->m, clk->n, clk->pl,
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pl_to_div[clk->pl]);
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return 0;
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}
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@ -360,7 +362,7 @@ _gk20a_pllg_program_mnp(struct gk20a_clk *clk, bool allow_slide)
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/* slide down to NDIV_LO */
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n_lo = DIV_ROUND_UP(m_old * clk->params->min_vco,
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clk->parent_rate / MHZ);
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clk->parent_rate / KHZ);
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if (allow_slide && (cfg & GPCPLL_CFG_ENABLE)) {
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int ret = gk20a_pllg_slide(clk, n_lo);
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@ -393,7 +395,7 @@ _gk20a_pllg_program_mnp(struct gk20a_clk *clk, bool allow_slide)
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clk->m, clk->n, clk->pl);
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n_lo = DIV_ROUND_UP(clk->m * clk->params->min_vco,
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clk->parent_rate / MHZ);
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clk->parent_rate / KHZ);
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val = clk->m << GPCPLL_COEFF_M_SHIFT;
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val |= (allow_slide ? n_lo : clk->n) << GPCPLL_COEFF_N_SHIFT;
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val |= clk->pl << GPCPLL_COEFF_P_SHIFT;
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@ -452,7 +454,7 @@ gk20a_pllg_disable(struct gk20a_clk *clk)
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coeff = nvkm_rd32(device, GPCPLL_COEFF);
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m = (coeff >> GPCPLL_COEFF_M_SHIFT) & MASK(GPCPLL_COEFF_M_WIDTH);
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n_lo = DIV_ROUND_UP(m * clk->params->min_vco,
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clk->parent_rate / MHZ);
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clk->parent_rate / KHZ);
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gk20a_pllg_slide(clk, n_lo);
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}
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@ -663,7 +665,7 @@ gk20a_clk_new(struct nvkm_device *device, int index, struct nvkm_clk **pclk)
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clk->parent_rate = clk_get_rate(tdev->clk);
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ret = nvkm_clk_ctor(&gk20a_clk, device, index, true, &clk->base);
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nvkm_info(&clk->base.subdev, "parent clock rate: %d Mhz\n",
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clk->parent_rate / MHZ);
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nvkm_info(&clk->base.subdev, "parent clock rate: %d Khz\n",
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clk->parent_rate / KHZ);
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return ret;
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}
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