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Message-Id: <20221010-rpi-clk-fixes-again-v1-2-d87ba82ac404@cerno.tech>
Date: Mon, 10 Oct 2022 16:47:39 +0200
From: Maxime Ripard <maxime@...no.tech>
To: Stephen Boyd <sboyd@...nel.org>,
Michael Turquette <mturquette@...libre.com>
Cc: linux-clk@...r.kernel.org, Mark Brown <broonie@...nel.org>,
linux-kernel@...r.kernel.org,
Marek Szyprowski <m.szyprowski@...sung.com>,
Maxime Ripard <maxime@...no.tech>
Subject: [PATCH 2/2] clk: tests: Add tests for notifiers
We're recently encountered a regression due to the rates reported
through the clk_notifier_data being off when changing parents.
Let's add a test suite and a test to make sure that we do get notified
and with the proper rates.
Suggested-by: Stephen Boyd <sboyd@...nel.org>
Signed-off-by: Maxime Ripard <maxime@...no.tech>
---
drivers/clk/clk_test.c | 156 +++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 156 insertions(+)
diff --git a/drivers/clk/clk_test.c b/drivers/clk/clk_test.c
index 509256c5567a..f9a5c2964c65 100644
--- a/drivers/clk/clk_test.c
+++ b/drivers/clk/clk_test.c
@@ -2239,10 +2239,166 @@ static struct kunit_suite clk_leaf_mux_set_rate_parent_test_suite = {
.test_cases = clk_leaf_mux_set_rate_parent_test_cases,
};
+struct clk_mux_notifier_rate_change {
+ bool done;
+ unsigned long old_rate;
+ unsigned long new_rate;
+ wait_queue_head_t wq;
+};
+
+struct clk_mux_notifier_ctx {
+ struct clk_multiple_parent_ctx mux_ctx;
+ struct clk *clk;
+ struct notifier_block clk_nb;
+ struct clk_mux_notifier_rate_change pre_rate_change;
+ struct clk_mux_notifier_rate_change post_rate_change;
+};
+
+#define NOTIFIER_TIMEOUT_MS 100
+
+static int clk_mux_notifier_callback(struct notifier_block *nb,
+ unsigned long action, void *data)
+{
+ struct clk_notifier_data *clk_data = data;
+ struct clk_mux_notifier_ctx *ctx = container_of(nb,
+ struct clk_mux_notifier_ctx,
+ clk_nb);
+
+ if (action & PRE_RATE_CHANGE) {
+ ctx->pre_rate_change.old_rate = clk_data->old_rate;
+ ctx->pre_rate_change.new_rate = clk_data->new_rate;
+ ctx->pre_rate_change.done = true;
+ wake_up_interruptible(&ctx->pre_rate_change.wq);
+ }
+
+ if (action & POST_RATE_CHANGE) {
+ ctx->post_rate_change.old_rate = clk_data->old_rate;
+ ctx->post_rate_change.new_rate = clk_data->new_rate;
+ ctx->post_rate_change.done = true;
+ wake_up_interruptible(&ctx->post_rate_change.wq);
+ }
+
+ return 0;
+}
+
+static int clk_mux_notifier_test_init(struct kunit *test)
+{
+ struct clk_mux_notifier_ctx *ctx;
+ const char *top_parents[2] = { "parent-0", "parent-1" };
+ int ret;
+
+ ctx = kunit_kzalloc(test, sizeof(*ctx), GFP_KERNEL);
+ if (!ctx)
+ return -ENOMEM;
+ test->priv = ctx;
+ ctx->clk_nb.notifier_call = clk_mux_notifier_callback;
+ init_waitqueue_head(&ctx->pre_rate_change.wq);
+ init_waitqueue_head(&ctx->post_rate_change.wq);
+
+ ctx->mux_ctx.parents_ctx[0].hw.init = CLK_HW_INIT_NO_PARENT("parent-0",
+ &clk_dummy_rate_ops,
+ 0);
+ ctx->mux_ctx.parents_ctx[0].rate = DUMMY_CLOCK_RATE_1;
+ ret = clk_hw_register(NULL, &ctx->mux_ctx.parents_ctx[0].hw);
+ if (ret)
+ return ret;
+
+ ctx->mux_ctx.parents_ctx[1].hw.init = CLK_HW_INIT_NO_PARENT("parent-1",
+ &clk_dummy_rate_ops,
+ 0);
+ ctx->mux_ctx.parents_ctx[1].rate = DUMMY_CLOCK_RATE_2;
+ ret = clk_hw_register(NULL, &ctx->mux_ctx.parents_ctx[1].hw);
+ if (ret)
+ return ret;
+
+ ctx->mux_ctx.current_parent = 0;
+ ctx->mux_ctx.hw.init = CLK_HW_INIT_PARENTS("test-mux", top_parents,
+ &clk_multiple_parents_mux_ops,
+ 0);
+ ret = clk_hw_register(NULL, &ctx->mux_ctx.hw);
+ if (ret)
+ return ret;
+
+ ctx->clk = clk_hw_get_clk(&ctx->mux_ctx.hw, NULL);
+ ret = clk_notifier_register(ctx->clk, &ctx->clk_nb);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static void clk_mux_notifier_test_exit(struct kunit *test)
+{
+ struct clk_mux_notifier_ctx *ctx = test->priv;
+ struct clk *clk = ctx->clk;
+
+ clk_notifier_unregister(clk, &ctx->clk_nb);
+ clk_put(clk);
+
+ clk_hw_unregister(&ctx->mux_ctx.hw);
+ clk_hw_unregister(&ctx->mux_ctx.parents_ctx[0].hw);
+ clk_hw_unregister(&ctx->mux_ctx.parents_ctx[1].hw);
+}
+
+/*
+ * Test that if the we have a notifier registered on a mux, the core
+ * will notify us when we switch to another parent, and with the proper
+ * old and new rates.
+ */
+static void clk_mux_notifier_set_parent_test(struct kunit *test)
+{
+ struct clk_mux_notifier_ctx *ctx = test->priv;
+ struct clk_hw *hw = &ctx->mux_ctx.hw;
+ struct clk *clk = clk_hw_get_clk(hw, NULL);
+ struct clk *new_parent = clk_hw_get_clk(&ctx->mux_ctx.parents_ctx[1].hw, NULL);
+ int ret;
+
+ ret = clk_set_parent(clk, new_parent);
+ KUNIT_ASSERT_EQ(test, ret, 0);
+
+ ret = wait_event_interruptible_timeout(ctx->pre_rate_change.wq,
+ ctx->pre_rate_change.done,
+ msecs_to_jiffies(NOTIFIER_TIMEOUT_MS));
+ KUNIT_ASSERT_GT(test, ret, 0);
+
+ KUNIT_EXPECT_EQ(test, ctx->pre_rate_change.old_rate, DUMMY_CLOCK_RATE_1);
+ KUNIT_EXPECT_EQ(test, ctx->pre_rate_change.new_rate, DUMMY_CLOCK_RATE_2);
+
+ ret = wait_event_interruptible_timeout(ctx->post_rate_change.wq,
+ ctx->post_rate_change.done,
+ msecs_to_jiffies(NOTIFIER_TIMEOUT_MS));
+ KUNIT_ASSERT_GT(test, ret, 0);
+
+ KUNIT_EXPECT_EQ(test, ctx->post_rate_change.old_rate, DUMMY_CLOCK_RATE_1);
+ KUNIT_EXPECT_EQ(test, ctx->post_rate_change.new_rate, DUMMY_CLOCK_RATE_2);
+
+ clk_put(new_parent);
+ clk_put(clk);
+}
+
+static struct kunit_case clk_mux_notifier_test_cases[] = {
+ KUNIT_CASE(clk_mux_notifier_set_parent_test),
+ {}
+};
+
+/*
+ * Test suite for a mux with multiple parents, and a notifier registered
+ * on the mux.
+ *
+ * These tests exercise the behaviour of notifiers.
+ */
+static struct kunit_suite clk_mux_notifier_test_suite = {
+ .name = "clk-mux-notifier",
+ .init = clk_mux_notifier_test_init,
+ .exit = clk_mux_notifier_test_exit,
+ .test_cases = clk_mux_notifier_test_cases,
+};
+
kunit_test_suites(
&clk_leaf_mux_set_rate_parent_test_suite,
&clk_test_suite,
&clk_multiple_parents_mux_test_suite,
+ &clk_mux_notifier_test_suite,
&clk_orphan_transparent_multiple_parent_mux_test_suite,
&clk_orphan_transparent_single_parent_test_suite,
&clk_orphan_two_level_root_last_test_suite,
--
b4 0.11.0-dev-7da52
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