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c16fcbc14a
While at the base level, this conversion looks equivalent, we now see
both of these tests failing (due to exceeding their allowed margin for
being too slow) in Azure with a very high frequency.
This reverts commit 88db4fc5fe.
Signed-off-by: Tom Rini <trini@konsulko.com>
Tested-by: Andrew Goodbody <andrew.goodbody@linaro.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
123 lines
2.6 KiB
C
123 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2015 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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*/
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#include <errno.h>
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#include <time.h>
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#include <linux/delay.h>
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#include <test/lib.h>
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#include <test/ut.h>
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static int test_get_timer(struct unit_test_state *uts)
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{
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ulong base, start, next, diff;
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int iter;
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base = get_timer(0);
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start = get_timer(0);
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for (iter = 0; iter < 10; iter++) {
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do {
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next = get_timer(0);
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} while (start == next);
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if (start + 1 != next) {
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printf("%s: iter=%d, start=%lu, next=%lu, expected a difference of 1\n",
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__func__, iter, start, next);
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return -EINVAL;
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}
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start++;
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}
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/*
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* Check that get_timer(base) matches our elapsed time, allowing that
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* an extra millisecond may have passed.
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*/
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diff = get_timer(base);
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if (diff != iter && diff != iter + 1) {
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printf("%s: expected get_timer(base) to match elapsed time: diff=%lu, expected=%d\n",
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__func__, diff, iter);
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return -EINVAL;
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}
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return 0;
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}
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LIB_TEST(test_get_timer, 0);
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static int test_timer_get_us(struct unit_test_state *uts)
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{
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ulong prev, next, min = 1000000;
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long delta;
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int iter;
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/* Find the minimum delta we can measure, in microseconds */
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prev = timer_get_us();
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for (iter = 0; iter < 100; ) {
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next = timer_get_us();
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if (next != prev) {
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delta = next - prev;
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if (delta < 0) {
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printf("%s: timer_get_us() went backwards from %lu to %lu\n",
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__func__, prev, next);
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return -EINVAL;
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} else if (delta != 0) {
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if (delta < min)
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min = delta;
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prev = next;
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iter++;
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}
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}
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}
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if (min != 1) {
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printf("%s: Minimum microsecond delta should be 1 but is %lu\n",
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__func__, min);
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return -EINVAL;
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}
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return 0;
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}
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LIB_TEST(test_timer_get_us, 0);
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static int test_time_comparison(struct unit_test_state *uts)
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{
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ulong start_us, end_us, delta_us;
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long error;
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ulong start;
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start = get_timer(0);
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start_us = timer_get_us();
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while (get_timer(start) < 1000)
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;
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end_us = timer_get_us();
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delta_us = end_us - start_us;
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error = delta_us - 1000000;
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printf("%s: Microsecond time for 1 second: %lu, error = %ld\n",
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__func__, delta_us, error);
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if (abs(error) > 1000)
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return -EINVAL;
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return 0;
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}
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LIB_TEST(test_time_comparison, 0);
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static int test_udelay(struct unit_test_state *uts)
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{
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long error;
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ulong start, delta;
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int iter;
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start = get_timer(0);
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for (iter = 0; iter < 1000; iter++)
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udelay(1000);
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delta = get_timer(start);
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error = delta - 1000;
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printf("%s: Delay time for 1000 udelay(1000): %lu ms, error = %ld\n",
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__func__, delta, error);
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if (abs(error) > 100)
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return -EINVAL;
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return 0;
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}
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LIB_TEST(test_udelay, 0);
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