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d678a59d2d
When bringing in the series 'arm: dts: am62-beagleplay: Fix Beagleplay Ethernet"' I failed to notice that b4 noticed it was based on next and so took that as the base commit and merged that part of next to master. This reverts commit c8ffd1356d42223cbb8c86280a083cc3c93e6426, reversing changes made to 2ee6f3a5f7550de3599faef9704e166e5dcace35. Reported-by: Jonas Karlman <jonas@kwiboo.se> Signed-off-by: Tom Rini <trini@konsulko.com>
95 lines
2.5 KiB
C
95 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2020 Sean Anderson <seanga2@gmail.com>
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*/
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#include <common.h>
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/* For DIV_ROUND_DOWN_ULL, defined in linux/kernel.h */
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#include <div64.h>
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#include <dm/test.h>
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#include <k210/pll.h>
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#include <test/ut.h>
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static int dm_test_k210_pll_calc_config(u32 rate, u32 rate_in,
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struct k210_pll_config *best)
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{
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u64 f, r, od, max_r, inv_ratio;
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s64 error, best_error;
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best_error = S64_MAX;
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error = best_error;
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max_r = min(16ULL, DIV_ROUND_DOWN_ULL(rate_in, 13300000));
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inv_ratio = DIV_ROUND_CLOSEST_ULL((u64)rate_in << 32, rate);
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/* Brute force it */
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for (r = 1; r <= max_r; r++) {
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for (f = 1; f <= 64; f++) {
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for (od = 1; od <= 16; od++) {
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u64 vco = DIV_ROUND_CLOSEST_ULL(rate_in * f, r);
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if (vco > 1750000000 || vco < 340000000)
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continue;
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error = DIV_ROUND_CLOSEST_ULL(f * inv_ratio,
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r * od);
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/* The lower 16 bits are spurious */
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error = abs64((error - BIT_ULL(32))) >> 16;
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if (error < best_error) {
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best->r = r;
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best->f = f;
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best->od = od;
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best_error = error;
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}
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}
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}
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}
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if (best_error == S64_MAX)
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return -EINVAL;
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return 0;
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}
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static int dm_test_k210_pll_compare(struct k210_pll_config *ours,
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struct k210_pll_config *theirs)
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{
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return (u32)ours->f * theirs->r * theirs->od !=
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(u32)theirs->f * ours->r * ours->od;
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}
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static int dm_test_k210_pll(struct unit_test_state *uts)
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{
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struct k210_pll_config ours, theirs;
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/* General range checks */
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ut_asserteq(-EINVAL, k210_pll_calc_config(0, 26000000, &theirs));
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ut_asserteq(-EINVAL, k210_pll_calc_config(390000000, 0, &theirs));
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ut_asserteq(-EINVAL, k210_pll_calc_config(2000000000, 26000000,
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&theirs));
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ut_asserteq(-EINVAL, k210_pll_calc_config(390000000, 2000000000,
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&theirs));
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ut_asserteq(-EINVAL, k210_pll_calc_config(1500000000, 20000000,
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&theirs));
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ut_asserteq(-EINVAL, k210_pll_calc_config(1750000000, 13300000,
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&theirs));
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/* Verify we get the same output with brute-force */
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#define compare(rate, rate_in) do { \
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ut_assertok(dm_test_k210_pll_calc_config(rate, rate_in, &ours)); \
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ut_assertok(k210_pll_calc_config(rate, rate_in, &theirs)); \
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ut_assertok(dm_test_k210_pll_compare(&ours, &theirs)); \
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} while (0)
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compare(390000000, 26000000);
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compare(26000000, 390000000);
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compare(400000000, 26000000);
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compare(27000000, 26000000);
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compare(26000000, 27000000);
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compare(13300000 * 64, 13300000);
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compare(21250000, 21250000 * 70);
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compare(21250000, 1750000000);
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compare(1750000000, 1750000000);
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return 0;
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}
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DM_TEST(dm_test_k210_pll, 0);
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