[PATCH v3 2/2] clk: tests: Add missing test cases for mux determine_rate

Yang Xiwen via B4 Relay
2023-04-26T19:34:26Z

From: Yang Xiwen <forbidden405@outlook.com>

Add lots of test cases for mux determine_rate to cover more possible
cases, the original test case is renamed for the change.

Signed-off-by: Yang Xiwen <forbidden405@outlook.com>
---
drivers/clk/clk_test.c | 131 ++++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 129 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/clk_test.c b/drivers/clk/clk_test.c
index f9a5c2964c65d..4f7f9a964637a 100644
--- a/drivers/clk/clk_test.c
+++ b/drivers/clk/clk_test.c
@@ -2194,7 +2194,47 @@ static void clk_leaf_mux_set_rate_parent_test_exit(struct kunit *test)
* parent, the rate request structure returned by __clk_determine_rate
* is sane and will be what we expect.
*/
-static void clk_leaf_mux_set_rate_parent_determine_rate(struct kunit *test)
+static void clk_leaf_mux_set_rate_parent_determine_rate_case1(struct kunit *test)
+{
+ struct clk_leaf_mux_ctx *ctx = test->priv;
+ struct clk_hw *hw = &ctx->hw;
+ struct clk *clk = clk_hw_get_clk(hw, NULL);
+ struct clk_rate_request req;
+ unsigned long rate;
+ int ret;
+
+ rate = clk_get_rate(clk);
+ KUNIT_ASSERT_EQ(test, rate, DUMMY_CLOCK_RATE_1);
+
+ clk_hw_init_rate_request(hw, &req, 0);
+
+ ret = __clk_determine_rate(hw, &req);
+ KUNIT_ASSERT_EQ(test, ret, -EINVAL);
+
+ clk_put(clk);
+}
+
+static void clk_leaf_mux_set_rate_parent_determine_rate_case2(struct kunit *test)
+{
+ struct clk_leaf_mux_ctx *ctx = test->priv;
+ struct clk_hw *hw = &ctx->hw;
+ struct clk *clk = clk_hw_get_clk(hw, NULL);
+ struct clk_rate_request req;
+ unsigned long rate;
+ int ret;
+
+ rate = clk_get_rate(clk);
+ KUNIT_ASSERT_EQ(test, rate, DUMMY_CLOCK_RATE_1);
+
+ clk_hw_init_rate_request(hw, &req, DUMMY_CLOCK_INIT_RATE);
+
+ ret = __clk_determine_rate(hw, &req);
+ KUNIT_ASSERT_EQ(test, ret, -EINVAL);
+
+ clk_put(clk);
+}
+
+static void clk_leaf_mux_set_rate_parent_determine_rate_case3(struct kunit *test)
{
struct clk_leaf_mux_ctx *ctx = test->priv;
struct clk_hw *hw = &ctx->hw;
@@ -2218,8 +2258,95 @@ static void clk_leaf_mux_set_rate_parent_determine_rate(struct kunit *test)
clk_put(clk);
}

+static void clk_leaf_mux_set_rate_parent_determine_rate_case4(struct kunit *test)
+{
+ struct clk_leaf_mux_ctx *ctx = test->priv;
+ struct clk_hw *hw = &ctx->hw;
+ struct clk *clk = clk_hw_get_clk(hw, NULL);
+ struct clk_rate_request req;
+ unsigned long rate;
+ int ret;
+
+ rate = clk_get_rate(clk);
+ KUNIT_ASSERT_EQ(test, rate, DUMMY_CLOCK_RATE_1);
+
+ clk_hw_init_rate_request(hw, &req, (DUMMY_CLOCK_RATE_1 + DUMMY_CLOCK_RATE_2) / 2);
+
+ ret = __clk_determine_rate(hw, &req);
+ KUNIT_ASSERT_EQ(test, ret, 0);
+
+ KUNIT_EXPECT_EQ(test, req.rate, DUMMY_CLOCK_RATE_1);
+ KUNIT_EXPECT_EQ(test, req.best_parent_rate, DUMMY_CLOCK_RATE_1);
+ KUNIT_EXPECT_PTR_EQ(test, req.best_parent_hw, &ctx->mux_ctx.hw);
+
+ clk_put(clk);
+}
+
+static void clk_leaf_mux_set_rate_parent_determine_rate_case5(struct kunit *test)
+{
+ struct clk_leaf_mux_ctx *ctx = test->priv;
+ struct clk_hw *hw = &ctx->hw;
+ struct clk *clk = clk_hw_get_clk(hw, NULL);
+ struct clk_rate_request req;
+ unsigned long rate;
+ int ret;
+
+ rate = clk_get_rate(clk);
+ KUNIT_ASSERT_EQ(test, rate, DUMMY_CLOCK_RATE_1);
+
+ clk_hw_init_rate_request(hw, &req, DUMMY_CLOCK_RATE_2 + 100000);
+
+ ret = __clk_determine_rate(hw, &req);
+ KUNIT_ASSERT_EQ(test, ret, 0);
+
+ KUNIT_EXPECT_EQ(test, req.rate, DUMMY_CLOCK_RATE_2);
+ KUNIT_EXPECT_EQ(test, req.best_parent_rate, DUMMY_CLOCK_RATE_2);
+ KUNIT_EXPECT_PTR_EQ(test, req.best_parent_hw, &ctx->mux_ctx.hw);
+
+ clk_put(clk);
+}
+
+static void clk_leaf_mux_set_rate_parent_determine_rate_case6(struct kunit *test)
+{
+ struct clk_leaf_mux_ctx *ctx = test->priv;
+ struct clk_hw *hw = &ctx->hw;
+ struct clk *clk = clk_hw_get_clk(hw, NULL);
+ struct clk_rate_request req;
+ unsigned long rate;
+ int ret;
+
+ rate = clk_get_rate(clk);
+ KUNIT_ASSERT_EQ(test, rate, DUMMY_CLOCK_RATE_1);
+
+ clk_hw_init_rate_request(hw, &req, ULONG_MAX);
+
+ ret = __clk_determine_rate(hw, &req);
+ KUNIT_ASSERT_EQ(test, ret, 0);
+
+ KUNIT_EXPECT_EQ(test, req.rate, DUMMY_CLOCK_RATE_2);
+ KUNIT_EXPECT_EQ(test, req.best_parent_rate, DUMMY_CLOCK_RATE_2);
+ KUNIT_EXPECT_PTR_EQ(test, req.best_parent_hw, &ctx->mux_ctx.hw);
+
+ clk_put(clk);
+}
+
+/* We test 6 cases here:
+ * 1. The requested rate is 0;
+ * 2. The requested rate is not 0 but lower than any rate that parents could offer;
+ * 3. The requested rate is exactly one of the parents' clock rate;
+ * 4. The requested rate is between the lowest clock rate and the highest clock rate that the parents could offer;
+ * 5. The requested rate is larger than all rates that parents could offer;
+ * 6. The requested rate is ULONG_MAX.
+ *
+ * Hopefully they covered all cases.
+ */
static struct kunit_case clk_leaf_mux_set_rate_parent_test_cases[] = {
- KUNIT_CASE(clk_leaf_mux_set_rate_parent_determine_rate),
+ KUNIT_CASE(clk_leaf_mux_set_rate_parent_determine_rate_case1),
+ KUNIT_CASE(clk_leaf_mux_set_rate_parent_determine_rate_case2),
+ KUNIT_CASE(clk_leaf_mux_set_rate_parent_determine_rate_case3),
+ KUNIT_CASE(clk_leaf_mux_set_rate_parent_determine_rate_case4),
+ KUNIT_CASE(clk_leaf_mux_set_rate_parent_determine_rate_case5),
+ KUNIT_CASE(clk_leaf_mux_set_rate_parent_determine_rate_case6),
{}
};

--
2.39.2