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clk: Introduce Kunit Tests for the framework

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Let's test various parts of the rate-related clock API with the kunit
testing framework.

Cc: kunit-dev@googlegroups.com
Tested-by: Daniel Latypov <dlatypov@google.com>
Suggested-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20220225143534.405820-3-maxime@cerno.tech
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
This commit is contained in:
Maxime Ripard 2022-02-25 15:35:24 +01:00 committed by Stephen Boyd
parent 0c1b56df45
commit 723d0530d9
4 changed files with 796 additions and 0 deletions
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1
drivers/clk/.kunitconfig
View File

@ -1,3 +1,4 @@
CONFIG_KUNIT=y
CONFIG_COMMON_CLK=y
CONFIG_CLK_KUNIT_TEST=y
CONFIG_CLK_GATE_KUNIT_TEST=y

7
drivers/clk/Kconfig
View File

@ -429,6 +429,13 @@ source "drivers/clk/xilinx/Kconfig"
source "drivers/clk/zynqmp/Kconfig"
# Kunit test cases
config CLK_KUNIT_TEST
tristate "Basic Clock Framework Kunit Tests" if !KUNIT_ALL_TESTS
depends on KUNIT
default KUNIT_ALL_TESTS
help
Kunit tests for the common clock framework.
config CLK_GATE_KUNIT_TEST
tristate "Basic gate type Kunit test" if !KUNIT_ALL_TESTS
depends on KUNIT

1
drivers/clk/Makefile
View File

@ -2,6 +2,7 @@
# common clock types
obj-$(CONFIG_HAVE_CLK) += clk-devres.o clk-bulk.o clkdev.o
obj-$(CONFIG_COMMON_CLK) += clk.o
obj-$(CONFIG_CLK_KUNIT_TEST) += clk_test.o
obj-$(CONFIG_COMMON_CLK) += clk-divider.o
obj-$(CONFIG_COMMON_CLK) += clk-fixed-factor.o
obj-$(CONFIG_COMMON_CLK) += clk-fixed-rate.o

787
drivers/clk/clk_test.c Normal file
View File

@ -0,0 +1,787 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Kunit test for clk rate management
*/
#include <linux/clk.h>
#include <linux/clk-provider.h>
/* Needed for clk_hw_get_clk() */
#include "clk.h"
#include <kunit/test.h>
#define DUMMY_CLOCK_INIT_RATE (42 * 1000 * 1000)
#define DUMMY_CLOCK_RATE_1 (142 * 1000 * 1000)
#define DUMMY_CLOCK_RATE_2 (242 * 1000 * 1000)
struct clk_dummy_context {
struct clk_hw hw;
unsigned long rate;
};
static unsigned long clk_dummy_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct clk_dummy_context *ctx =
container_of(hw, struct clk_dummy_context, hw);
return ctx->rate;
}
static int clk_dummy_determine_rate(struct clk_hw *hw,
struct clk_rate_request *req)
{
/* Just return the same rate without modifying it */
return 0;
}
static int clk_dummy_maximize_rate(struct clk_hw *hw,
struct clk_rate_request *req)
{
/*
* If there's a maximum set, always run the clock at the maximum
* allowed.
*/
if (req->max_rate < ULONG_MAX)
req->rate = req->max_rate;
return 0;
}
static int clk_dummy_minimize_rate(struct clk_hw *hw,
struct clk_rate_request *req)
{
/*
* If there's a minimum set, always run the clock at the minimum
* allowed.
*/
if (req->min_rate > 0)
req->rate = req->min_rate;
return 0;
}
static int clk_dummy_set_rate(struct clk_hw *hw,
unsigned long rate,
unsigned long parent_rate)
{
struct clk_dummy_context *ctx =
container_of(hw, struct clk_dummy_context, hw);
ctx->rate = rate;
return 0;
}
static const struct clk_ops clk_dummy_rate_ops = {
.recalc_rate = clk_dummy_recalc_rate,
.determine_rate = clk_dummy_determine_rate,
.set_rate = clk_dummy_set_rate,
};
static const struct clk_ops clk_dummy_maximize_rate_ops = {
.recalc_rate = clk_dummy_recalc_rate,
.determine_rate = clk_dummy_maximize_rate,
.set_rate = clk_dummy_set_rate,
};
static const struct clk_ops clk_dummy_minimize_rate_ops = {
.recalc_rate = clk_dummy_recalc_rate,
.determine_rate = clk_dummy_minimize_rate,
.set_rate = clk_dummy_set_rate,
};
static int clk_test_init_with_ops(struct kunit *test, const struct clk_ops *ops)
{
struct clk_dummy_context *ctx;
struct clk_init_data init = { };
int ret;
ctx = kunit_kzalloc(test, sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return -ENOMEM;
ctx->rate = DUMMY_CLOCK_INIT_RATE;
test->priv = ctx;
init.name = "test_dummy_rate";
init.ops = ops;
ctx->hw.init = &init;
ret = clk_hw_register(NULL, &ctx->hw);
if (ret)
return ret;
return 0;
}
static int clk_test_init(struct kunit *test)
{
return clk_test_init_with_ops(test, &clk_dummy_rate_ops);
}
static int clk_maximize_test_init(struct kunit *test)
{
return clk_test_init_with_ops(test, &clk_dummy_maximize_rate_ops);
}
static int clk_minimize_test_init(struct kunit *test)
{
return clk_test_init_with_ops(test, &clk_dummy_minimize_rate_ops);
}
static void clk_test_exit(struct kunit *test)
{
struct clk_dummy_context *ctx = test->priv;
clk_hw_unregister(&ctx->hw);
}
/*
* Test that the actual rate matches what is returned by clk_get_rate()
*/
static void clk_test_get_rate(struct kunit *test)
{
struct clk_dummy_context *ctx = test->priv;
struct clk_hw *hw = &ctx->hw;
struct clk *clk = hw->clk;
unsigned long rate;
rate = clk_get_rate(clk);
KUNIT_ASSERT_GT(test, rate, 0);
KUNIT_EXPECT_EQ(test, rate, ctx->rate);
}
/*
* Test that, after a call to clk_set_rate(), the rate returned by
* clk_get_rate() matches.
*
* This assumes that clk_ops.determine_rate or clk_ops.round_rate won't
* modify the requested rate, which is our case in clk_dummy_rate_ops.
*/
static void clk_test_set_get_rate(struct kunit *test)
{
struct clk_dummy_context *ctx = test->priv;
struct clk_hw *hw = &ctx->hw;
struct clk *clk = hw->clk;
unsigned long rate;
KUNIT_ASSERT_EQ(test,
clk_set_rate(clk, DUMMY_CLOCK_RATE_1),
0);
rate = clk_get_rate(clk);
KUNIT_ASSERT_GT(test, rate, 0);
KUNIT_EXPECT_EQ(test, rate, DUMMY_CLOCK_RATE_1);
}
/*
* Test that, after several calls to clk_set_rate(), the rate returned
* by clk_get_rate() matches the last one.
*
* This assumes that clk_ops.determine_rate or clk_ops.round_rate won't
* modify the requested rate, which is our case in clk_dummy_rate_ops.
*/
static void clk_test_set_set_get_rate(struct kunit *test)
{
struct clk_dummy_context *ctx = test->priv;
struct clk_hw *hw = &ctx->hw;
struct clk *clk = hw->clk;
unsigned long rate;
KUNIT_ASSERT_EQ(test,
clk_set_rate(clk, DUMMY_CLOCK_RATE_1),
0);
KUNIT_ASSERT_EQ(test,
clk_set_rate(clk, DUMMY_CLOCK_RATE_2),
0);
rate = clk_get_rate(clk);
KUNIT_ASSERT_GT(test, rate, 0);
KUNIT_EXPECT_EQ(test, rate, DUMMY_CLOCK_RATE_2);
}
/*
* Test that clk_round_rate and clk_set_rate are consitent and will
* return the same frequency.
*/
static void clk_test_round_set_get_rate(struct kunit *test)
{
struct clk_dummy_context *ctx = test->priv;
struct clk_hw *hw = &ctx->hw;
struct clk *clk = hw->clk;
unsigned long rounded_rate, set_rate;
rounded_rate = clk_round_rate(clk, DUMMY_CLOCK_RATE_1);
KUNIT_ASSERT_GT(test, rounded_rate, 0);
KUNIT_EXPECT_EQ(test, rounded_rate, DUMMY_CLOCK_RATE_1);
KUNIT_ASSERT_EQ(test,
clk_set_rate(clk, DUMMY_CLOCK_RATE_1),
0);
set_rate = clk_get_rate(clk);
KUNIT_ASSERT_GT(test, set_rate, 0);
KUNIT_EXPECT_EQ(test, rounded_rate, set_rate);
}
static struct kunit_case clk_test_cases[] = {
KUNIT_CASE(clk_test_get_rate),
KUNIT_CASE(clk_test_set_get_rate),
KUNIT_CASE(clk_test_set_set_get_rate),
KUNIT_CASE(clk_test_round_set_get_rate),
{}
};
static struct kunit_suite clk_test_suite = {
.name = "clk-test",
.init = clk_test_init,
.exit = clk_test_exit,
.test_cases = clk_test_cases,
};
/*
* Test that clk_set_rate_range won't return an error for a valid range
* and that it will make sure the rate of the clock is within the
* boundaries.
*/
static void clk_range_test_set_range(struct kunit *test)
{
struct clk_dummy_context *ctx = test->priv;
struct clk_hw *hw = &ctx->hw;
struct clk *clk = hw->clk;
unsigned long rate;
KUNIT_ASSERT_EQ(test,
clk_set_rate_range(clk,
DUMMY_CLOCK_RATE_1,
DUMMY_CLOCK_RATE_2),
0);
rate = clk_get_rate(clk);
KUNIT_ASSERT_GT(test, rate, 0);
KUNIT_EXPECT_GE(test, rate, DUMMY_CLOCK_RATE_1);
KUNIT_EXPECT_LE(test, rate, DUMMY_CLOCK_RATE_2);
}
/*
* Test that calling clk_set_rate_range with a minimum rate higher than
* the maximum rate returns an error.
*/
static void clk_range_test_set_range_invalid(struct kunit *test)
{
struct clk_dummy_context *ctx = test->priv;
struct clk_hw *hw = &ctx->hw;
struct clk *clk = hw->clk;
KUNIT_EXPECT_LT(test,
clk_set_rate_range(clk,
DUMMY_CLOCK_RATE_1 + 1000,
DUMMY_CLOCK_RATE_1),
0);
}
/*
* Test that users can't set multiple, disjoints, range that would be
* impossible to meet.
*/
static void clk_range_test_multiple_disjoints_range(struct kunit *test)
{
struct clk_dummy_context *ctx = test->priv;
struct clk_hw *hw = &ctx->hw;
struct clk *user1, *user2;
user1 = clk_hw_get_clk(hw, NULL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, user1);
user2 = clk_hw_get_clk(hw, NULL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, user2);
KUNIT_ASSERT_EQ(test,
clk_set_rate_range(user1, 1000, 2000),
0);
KUNIT_EXPECT_LT(test,
clk_set_rate_range(user2, 3000, 4000),
0);
clk_put(user2);
clk_put(user1);
}
/*
* Test that if our clock has some boundaries and we try to round a rate
* lower than the minimum, the returned rate won't be affected by the
* boundaries.
*/
static void clk_range_test_set_range_round_rate_lower(struct kunit *test)
{
struct clk_dummy_context *ctx = test->priv;
struct clk_hw *hw = &ctx->hw;
struct clk *clk = hw->clk;
long rate;
KUNIT_ASSERT_EQ(test,
clk_set_rate_range(clk,
DUMMY_CLOCK_RATE_1,
DUMMY_CLOCK_RATE_2),
0);
rate = clk_round_rate(clk, DUMMY_CLOCK_RATE_1 - 1000);
KUNIT_ASSERT_GT(test, rate, 0);
KUNIT_EXPECT_EQ(test, rate, DUMMY_CLOCK_RATE_1 - 1000);
}
/*
* Test that if our clock has some boundaries and we try to set a rate
* lower than the minimum, we'll get an error.
*/
static void clk_range_test_set_range_set_rate_lower(struct kunit *test)
{
struct clk_dummy_context *ctx = test->priv;
struct clk_hw *hw = &ctx->hw;
struct clk *clk = hw->clk;
KUNIT_ASSERT_EQ(test,
clk_set_rate_range(clk,
DUMMY_CLOCK_RATE_1,
DUMMY_CLOCK_RATE_2),
0);
KUNIT_ASSERT_LT(test,
clk_set_rate(clk, DUMMY_CLOCK_RATE_1 - 1000),
0);
}
/*
* Test that if our clock has some boundaries and we try to round and
* set a rate lower than the minimum, the values won't be consistent
* between clk_round_rate() and clk_set_rate().
*/
static void clk_range_test_set_range_set_round_rate_consistent_lower(struct kunit *test)
{
struct clk_dummy_context *ctx = test->priv;
struct clk_hw *hw = &ctx->hw;
struct clk *clk = hw->clk;
long rounded;
KUNIT_ASSERT_EQ(test,
clk_set_rate_range(clk,
DUMMY_CLOCK_RATE_1,
DUMMY_CLOCK_RATE_2),
0);
rounded = clk_round_rate(clk, DUMMY_CLOCK_RATE_1 - 1000);
KUNIT_ASSERT_GT(test, rounded, 0);
KUNIT_EXPECT_LT(test,
clk_set_rate(clk, DUMMY_CLOCK_RATE_1 - 1000),
0);
KUNIT_EXPECT_NE(test, rounded, clk_get_rate(clk));
}
/*
* Test that if our clock has some boundaries and we try to round a rate
* higher than the maximum, the returned rate won't be affected by the
* boundaries.
*/
static void clk_range_test_set_range_round_rate_higher(struct kunit *test)
{
struct clk_dummy_context *ctx = test->priv;
struct clk_hw *hw = &ctx->hw;
struct clk *clk = hw->clk;
long rate;
KUNIT_ASSERT_EQ(test,
clk_set_rate_range(clk,
DUMMY_CLOCK_RATE_1,
DUMMY_CLOCK_RATE_2),
0);
rate = clk_round_rate(clk, DUMMY_CLOCK_RATE_2 + 1000);
KUNIT_ASSERT_GT(test, rate, 0);
KUNIT_EXPECT_EQ(test, rate, DUMMY_CLOCK_RATE_2 + 1000);
}
/*
* Test that if our clock has some boundaries and we try to set a rate
* lower than the maximum, we'll get an error.
*/
static void clk_range_test_set_range_set_rate_higher(struct kunit *test)
{
struct clk_dummy_context *ctx = test->priv;
struct clk_hw *hw = &ctx->hw;
struct clk *clk = hw->clk;
KUNIT_ASSERT_EQ(test,
clk_set_rate_range(clk,
DUMMY_CLOCK_RATE_1,
DUMMY_CLOCK_RATE_2),
0);
KUNIT_ASSERT_LT(test,
clk_set_rate(clk, DUMMY_CLOCK_RATE_2 + 1000),
0);
}
/*
* Test that if our clock has some boundaries and we try to round and
* set a rate higher than the maximum, the values won't be consistent
* between clk_round_rate() and clk_set_rate().
*/
static void clk_range_test_set_range_set_round_rate_consistent_higher(struct kunit *test)
{
struct clk_dummy_context *ctx = test->priv;
struct clk_hw *hw = &ctx->hw;
struct clk *clk = hw->clk;
long rounded;
KUNIT_ASSERT_EQ(test,
clk_set_rate_range(clk,
DUMMY_CLOCK_RATE_1,
DUMMY_CLOCK_RATE_2),
0);
rounded = clk_round_rate(clk, DUMMY_CLOCK_RATE_2 + 1000);
KUNIT_ASSERT_GT(test, rounded, 0);
KUNIT_EXPECT_LT(test,
clk_set_rate(clk, DUMMY_CLOCK_RATE_2 + 1000),
0);
KUNIT_EXPECT_NE(test, rounded, clk_get_rate(clk));
}
/*
* Test that if our clock has a rate lower than the minimum set by a
* call to clk_set_rate_range(), the rate will be raised to match the
* new minimum.
*
* This assumes that clk_ops.determine_rate or clk_ops.round_rate won't
* modify the requested rate, which is our case in clk_dummy_rate_ops.
*/
static void clk_range_test_set_range_get_rate_raised(struct kunit *test)
{
struct clk_dummy_context *ctx = test->priv;
struct clk_hw *hw = &ctx->hw;
struct clk *clk = hw->clk;
unsigned long rate;
KUNIT_ASSERT_EQ(test,
clk_set_rate(clk, DUMMY_CLOCK_RATE_1 - 1000),
0);
KUNIT_ASSERT_EQ(test,
clk_set_rate_range(clk,
DUMMY_CLOCK_RATE_1,
DUMMY_CLOCK_RATE_2),
0);
rate = clk_get_rate(clk);
KUNIT_ASSERT_GT(test, rate, 0);
KUNIT_EXPECT_EQ(test, rate, DUMMY_CLOCK_RATE_1);
}
/*
* Test that if our clock has a rate higher than the maximum set by a
* call to clk_set_rate_range(), the rate will be lowered to match the
* new maximum.
*
* This assumes that clk_ops.determine_rate or clk_ops.round_rate won't
* modify the requested rate, which is our case in clk_dummy_rate_ops.
*/
static void clk_range_test_set_range_get_rate_lowered(struct kunit *test)
{
struct clk_dummy_context *ctx = test->priv;
struct clk_hw *hw = &ctx->hw;
struct clk *clk = hw->clk;
unsigned long rate;
KUNIT_ASSERT_EQ(test,
clk_set_rate(clk, DUMMY_CLOCK_RATE_2 + 1000),
0);
KUNIT_ASSERT_EQ(test,
clk_set_rate_range(clk,
DUMMY_CLOCK_RATE_1,
DUMMY_CLOCK_RATE_2),
0);
rate = clk_get_rate(clk);
KUNIT_ASSERT_GT(test, rate, 0);
KUNIT_EXPECT_EQ(test, rate, DUMMY_CLOCK_RATE_2);
}
static struct kunit_case clk_range_test_cases[] = {
KUNIT_CASE(clk_range_test_set_range),
KUNIT_CASE(clk_range_test_set_range_invalid),
KUNIT_CASE(clk_range_test_multiple_disjoints_range),
KUNIT_CASE(clk_range_test_set_range_round_rate_lower),
KUNIT_CASE(clk_range_test_set_range_set_rate_lower),
KUNIT_CASE(clk_range_test_set_range_set_round_rate_consistent_lower),
KUNIT_CASE(clk_range_test_set_range_round_rate_higher),
KUNIT_CASE(clk_range_test_set_range_set_rate_higher),
KUNIT_CASE(clk_range_test_set_range_set_round_rate_consistent_higher),
KUNIT_CASE(clk_range_test_set_range_get_rate_raised),
KUNIT_CASE(clk_range_test_set_range_get_rate_lowered),
{}
};
static struct kunit_suite clk_range_test_suite = {
.name = "clk-range-test",
.init = clk_test_init,
.exit = clk_test_exit,
.test_cases = clk_range_test_cases,
};
/*
* Test that if:
* - we have several subsequent calls to clk_set_rate_range();
* - and we have a round_rate ops that always return the maximum
* frequency allowed;
*
* The clock will run at the minimum of all maximum boundaries
* requested, even if those boundaries aren't there anymore.
*/
static void clk_range_test_set_range_rate_maximized(struct kunit *test)
{
struct clk_dummy_context *ctx = test->priv;
struct clk_hw *hw = &ctx->hw;
struct clk *clk = hw->clk;
unsigned long rate;
KUNIT_ASSERT_EQ(test,
clk_set_rate(clk, DUMMY_CLOCK_RATE_2 + 1000),
0);
KUNIT_ASSERT_EQ(test,
clk_set_rate_range(clk,
DUMMY_CLOCK_RATE_1,
DUMMY_CLOCK_RATE_2),
0);
rate = clk_get_rate(clk);
KUNIT_ASSERT_GT(test, rate, 0);
KUNIT_EXPECT_EQ(test, rate, DUMMY_CLOCK_RATE_2);
KUNIT_ASSERT_EQ(test,
clk_set_rate_range(clk,
DUMMY_CLOCK_RATE_1,
DUMMY_CLOCK_RATE_2 - 1000),
0);
rate = clk_get_rate(clk);
KUNIT_ASSERT_GT(test, rate, 0);
KUNIT_EXPECT_EQ(test, rate, DUMMY_CLOCK_RATE_2 - 1000);
KUNIT_ASSERT_EQ(test,
clk_set_rate_range(clk,
DUMMY_CLOCK_RATE_1,
DUMMY_CLOCK_RATE_2),
0);
rate = clk_get_rate(clk);
KUNIT_ASSERT_GT(test, rate, 0);
KUNIT_EXPECT_EQ(test, rate, DUMMY_CLOCK_RATE_2 - 1000);
}
/*
* Test that if:
* - we have several subsequent calls to clk_set_rate_range(), across
* multiple users;
* - and we have a round_rate ops that always return the maximum
* frequency allowed;
*
* The clock will run at the minimum of all maximum boundaries
* requested, even if those boundaries aren't there anymore.
*/
static void clk_range_test_multiple_set_range_rate_maximized(struct kunit *test)
{
struct clk_dummy_context *ctx = test->priv;
struct clk_hw *hw = &ctx->hw;
struct clk *clk = hw->clk;
struct clk *user1, *user2;
unsigned long rate;
user1 = clk_hw_get_clk(hw, NULL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, user1);
user2 = clk_hw_get_clk(hw, NULL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, user2);
KUNIT_ASSERT_EQ(test,
clk_set_rate(clk, DUMMY_CLOCK_RATE_2 + 1000),
0);
KUNIT_ASSERT_EQ(test,
clk_set_rate_range(user1,
0,
DUMMY_CLOCK_RATE_2),
0);
rate = clk_get_rate(clk);
KUNIT_ASSERT_GT(test, rate, 0);
KUNIT_EXPECT_EQ(test, rate, DUMMY_CLOCK_RATE_2);
KUNIT_ASSERT_EQ(test,
clk_set_rate_range(user2,
0,
DUMMY_CLOCK_RATE_1),
0);
rate = clk_get_rate(clk);
KUNIT_ASSERT_GT(test, rate, 0);
KUNIT_EXPECT_EQ(test, rate, DUMMY_CLOCK_RATE_1);
KUNIT_ASSERT_EQ(test,
clk_set_rate_range(user2, 0, ULONG_MAX),
0);
rate = clk_get_rate(clk);
KUNIT_ASSERT_GT(test, rate, 0);
KUNIT_EXPECT_EQ(test, rate, DUMMY_CLOCK_RATE_1);
clk_put(user2);
clk_put(user1);
}
static struct kunit_case clk_range_maximize_test_cases[] = {
KUNIT_CASE(clk_range_test_set_range_rate_maximized),
KUNIT_CASE(clk_range_test_multiple_set_range_rate_maximized),
{}
};
static struct kunit_suite clk_range_maximize_test_suite = {
.name = "clk-range-maximize-test",
.init = clk_maximize_test_init,
.exit = clk_test_exit,
.test_cases = clk_range_maximize_test_cases,
};
/*
* Test that if:
* - we have several subsequent calls to clk_set_rate_range()
* - and we have a round_rate ops that always return the minimum
* frequency allowed;
*
* The clock will run at the maximum of all minimum boundaries
* requested, even if those boundaries aren't there anymore.
*/
static void clk_range_test_set_range_rate_minimized(struct kunit *test)
{
struct clk_dummy_context *ctx = test->priv;
struct clk_hw *hw = &ctx->hw;
struct clk *clk = hw->clk;
unsigned long rate;
KUNIT_ASSERT_EQ(test,
clk_set_rate(clk, DUMMY_CLOCK_RATE_1 - 1000),
0);
KUNIT_ASSERT_EQ(test,
clk_set_rate_range(clk,
DUMMY_CLOCK_RATE_1,
DUMMY_CLOCK_RATE_2),
0);
rate = clk_get_rate(clk);
KUNIT_ASSERT_GT(test, rate, 0);
KUNIT_EXPECT_EQ(test, rate, DUMMY_CLOCK_RATE_1);
KUNIT_ASSERT_EQ(test,
clk_set_rate_range(clk,
DUMMY_CLOCK_RATE_1 + 1000,
DUMMY_CLOCK_RATE_2),
0);
rate = clk_get_rate(clk);
KUNIT_ASSERT_GT(test, rate, 0);
KUNIT_EXPECT_EQ(test, rate, DUMMY_CLOCK_RATE_1 + 1000);
KUNIT_ASSERT_EQ(test,
clk_set_rate_range(clk,
DUMMY_CLOCK_RATE_1,
DUMMY_CLOCK_RATE_2),
0);
rate = clk_get_rate(clk);
KUNIT_ASSERT_GT(test, rate, 0);
KUNIT_EXPECT_EQ(test, rate, DUMMY_CLOCK_RATE_1 + 1000);
}
/*
* Test that if:
* - we have several subsequent calls to clk_set_rate_range(), across
* multiple users;
* - and we have a round_rate ops that always return the minimum
* frequency allowed;
*
* The clock will run at the maximum of all minimum boundaries
* requested, even if those boundaries aren't there anymore.
*/
static void clk_range_test_multiple_set_range_rate_minimized(struct kunit *test)
{
struct clk_dummy_context *ctx = test->priv;
struct clk_hw *hw = &ctx->hw;
struct clk *clk = hw->clk;
struct clk *user1, *user2;
unsigned long rate;
user1 = clk_hw_get_clk(hw, NULL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, user1);
user2 = clk_hw_get_clk(hw, NULL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, user2);
KUNIT_ASSERT_EQ(test,
clk_set_rate_range(user1,
DUMMY_CLOCK_RATE_1,
ULONG_MAX),
0);
rate = clk_get_rate(clk);
KUNIT_ASSERT_GT(test, rate, 0);
KUNIT_EXPECT_EQ(test, rate, DUMMY_CLOCK_RATE_1);
KUNIT_ASSERT_EQ(test,
clk_set_rate_range(user2,
DUMMY_CLOCK_RATE_2,
ULONG_MAX),
0);
rate = clk_get_rate(clk);
KUNIT_ASSERT_GT(test, rate, 0);
KUNIT_EXPECT_EQ(test, rate, DUMMY_CLOCK_RATE_2);
KUNIT_ASSERT_EQ(test,
clk_set_rate_range(user2, 0, ULONG_MAX),
0);
rate = clk_get_rate(clk);
KUNIT_ASSERT_GT(test, rate, 0);
KUNIT_EXPECT_EQ(test, rate, DUMMY_CLOCK_RATE_2);
clk_put(user2);
clk_put(user1);
}
static struct kunit_case clk_range_minimize_test_cases[] = {
KUNIT_CASE(clk_range_test_set_range_rate_minimized),
KUNIT_CASE(clk_range_test_multiple_set_range_rate_minimized),
{}
};
static struct kunit_suite clk_range_minimize_test_suite = {
.name = "clk-range-minimize-test",
.init = clk_minimize_test_init,
.exit = clk_test_exit,
.test_cases = clk_range_minimize_test_cases,
};
kunit_test_suites(
&clk_test_suite,
&clk_range_test_suite,
&clk_range_maximize_test_suite,
&clk_range_minimize_test_suite
);
MODULE_LICENSE("GPL v2");