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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-18 17:39:57 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-18 17:39:57 +0000 |
commit | dc50eab76b709d68175a358d6e23a5a3890764d3 (patch) | |
tree | c754d0390db060af0213ff994f0ac310e4cfd6e9 /drivers/clk/clk-fractional-divider_test.c | |
parent | Adding debian version 6.6.15-2. (diff) | |
download | linux-dc50eab76b709d68175a358d6e23a5a3890764d3.tar.xz linux-dc50eab76b709d68175a358d6e23a5a3890764d3.zip |
Merging upstream version 6.7.7.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/clk/clk-fractional-divider_test.c')
-rw-r--r-- | drivers/clk/clk-fractional-divider_test.c | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/drivers/clk/clk-fractional-divider_test.c b/drivers/clk/clk-fractional-divider_test.c new file mode 100644 index 0000000000..929eec9275 --- /dev/null +++ b/drivers/clk/clk-fractional-divider_test.c @@ -0,0 +1,147 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Kunit test for clock fractional divider + */ +#include <linux/clk-provider.h> +#include <kunit/test.h> + +#include "clk-fractional-divider.h" + +/* + * Test the maximum denominator case for fd clock without flags. + * + * Expect the highest possible denominator to be used in order to get as close as possible to the + * requested rate. + */ +static void clk_fd_test_approximation_max_denominator(struct kunit *test) +{ + struct clk_fractional_divider *fd; + unsigned long rate, parent_rate, parent_rate_before, m, n, max_n; + + fd = kunit_kzalloc(test, sizeof(*fd), GFP_KERNEL); + KUNIT_ASSERT_NOT_NULL(test, fd); + + fd->mwidth = 3; + fd->nwidth = 3; + max_n = 7; + + rate = 240000000; + parent_rate = (max_n + 1) * rate; /* so that it exceeds the maximum divisor */ + parent_rate_before = parent_rate; + + clk_fractional_divider_general_approximation(&fd->hw, rate, &parent_rate, &m, &n); + KUNIT_ASSERT_EQ(test, parent_rate, parent_rate_before); + + KUNIT_EXPECT_EQ(test, m, 1); + KUNIT_EXPECT_EQ(test, n, max_n); +} + +/* + * Test the maximum numerator case for fd clock without flags. + * + * Expect the highest possible numerator to be used in order to get as close as possible to the + * requested rate. + */ +static void clk_fd_test_approximation_max_numerator(struct kunit *test) +{ + struct clk_fractional_divider *fd; + unsigned long rate, parent_rate, parent_rate_before, m, n, max_m; + + fd = kunit_kzalloc(test, sizeof(*fd), GFP_KERNEL); + KUNIT_ASSERT_NOT_NULL(test, fd); + + fd->mwidth = 3; + max_m = 7; + fd->nwidth = 3; + + rate = 240000000; + parent_rate = rate / (max_m + 1); /* so that it exceeds the maximum numerator */ + parent_rate_before = parent_rate; + + clk_fractional_divider_general_approximation(&fd->hw, rate, &parent_rate, &m, &n); + KUNIT_ASSERT_EQ(test, parent_rate, parent_rate_before); + + KUNIT_EXPECT_EQ(test, m, max_m); + KUNIT_EXPECT_EQ(test, n, 1); +} + +/* + * Test the maximum denominator case for zero based fd clock. + * + * Expect the highest possible denominator to be used in order to get as close as possible to the + * requested rate. + */ +static void clk_fd_test_approximation_max_denominator_zero_based(struct kunit *test) +{ + struct clk_fractional_divider *fd; + unsigned long rate, parent_rate, parent_rate_before, m, n, max_n; + + fd = kunit_kzalloc(test, sizeof(*fd), GFP_KERNEL); + KUNIT_ASSERT_NOT_NULL(test, fd); + + fd->flags = CLK_FRAC_DIVIDER_ZERO_BASED; + fd->mwidth = 3; + fd->nwidth = 3; + max_n = 8; + + rate = 240000000; + parent_rate = (max_n + 1) * rate; /* so that it exceeds the maximum divisor */ + parent_rate_before = parent_rate; + + clk_fractional_divider_general_approximation(&fd->hw, rate, &parent_rate, &m, &n); + KUNIT_ASSERT_EQ(test, parent_rate, parent_rate_before); + + KUNIT_EXPECT_EQ(test, m, 1); + KUNIT_EXPECT_EQ(test, n, max_n); +} + +/* + * Test the maximum numerator case for zero based fd clock. + * + * Expect the highest possible numerator to be used in order to get as close as possible to the + * requested rate. + */ +static void clk_fd_test_approximation_max_numerator_zero_based(struct kunit *test) +{ + struct clk_fractional_divider *fd; + unsigned long rate, parent_rate, parent_rate_before, m, n, max_m; + + fd = kunit_kzalloc(test, sizeof(*fd), GFP_KERNEL); + KUNIT_ASSERT_NOT_NULL(test, fd); + + fd->flags = CLK_FRAC_DIVIDER_ZERO_BASED; + fd->mwidth = 3; + max_m = 8; + fd->nwidth = 3; + + rate = 240000000; + parent_rate = rate / (max_m + 1); /* so that it exceeds the maximum numerator */ + parent_rate_before = parent_rate; + + clk_fractional_divider_general_approximation(&fd->hw, rate, &parent_rate, &m, &n); + KUNIT_ASSERT_EQ(test, parent_rate, parent_rate_before); + + KUNIT_EXPECT_EQ(test, m, max_m); + KUNIT_EXPECT_EQ(test, n, 1); +} + +static struct kunit_case clk_fd_approximation_test_cases[] = { + KUNIT_CASE(clk_fd_test_approximation_max_denominator), + KUNIT_CASE(clk_fd_test_approximation_max_numerator), + KUNIT_CASE(clk_fd_test_approximation_max_denominator_zero_based), + KUNIT_CASE(clk_fd_test_approximation_max_numerator_zero_based), + {} +}; + +/* + * Test suite for clk_fractional_divider_general_approximation(). + */ +static struct kunit_suite clk_fd_approximation_suite = { + .name = "clk-fd-approximation", + .test_cases = clk_fd_approximation_test_cases, +}; + +kunit_test_suites( + &clk_fd_approximation_suite +); +MODULE_LICENSE("GPL"); |