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20ea6adbf1
Build system: x86_64 Build-tested: bcm2708, bcm2709, bcm2710, bcm2711 Run-tested: bcm2708/RPiB+, bcm2709/RPi3B, bcm2710/RPi3B, bcm2711/RPi4B Signed-off-by: Marty Jones <mj8263788@gmail.com> Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
124 lines
4.5 KiB
Diff
124 lines
4.5 KiB
Diff
From 655e66b0add0aba16e84587dbb939f8ddce612b0 Mon Sep 17 00:00:00 2001
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From: Maxime Ripard <maxime@cerno.tech>
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Date: Fri, 1 Apr 2022 15:27:09 +0200
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Subject: [PATCH] clk: Skip set_rate_range if our clock is orphan
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clk_set_rate_range will now force a clk_set_rate() call to
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core->req_rate. However, if our clock is orphan, req_rate will be 0 and
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we will thus end up calling a set_rate to 0 on potentially all that
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clock subtree.
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This can be fairly invasive and result in poor decisions. In such a
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case, let's just store the new range but bail out and skip the set_rate.
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When that clock is no longer orphan though, we should be enforcing the
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new range but we don't. Let's add a skipped test to make sure we don't
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forget about that corner case.
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Tested-by: Alexander Stein <alexander.stein@ew.tq-group.com> # imx8mp
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Tested-by: Marek Szyprowski <m.szyprowski@samsung.com> # exynos4210, meson g12b
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Signed-off-by: Maxime Ripard <maxime@cerno.tech>
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---
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drivers/clk/clk.c | 6 +++++
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drivers/clk/clk_test.c | 59 ++++++++++++++++++++++++++++++++++++++++++
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2 files changed, 65 insertions(+)
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--- a/drivers/clk/clk.c
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+++ b/drivers/clk/clk.c
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@@ -2388,6 +2388,12 @@ static int clk_set_rate_range_nolock(str
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if (clk->core->flags & CLK_GET_RATE_NOCACHE)
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rate = clk_core_get_rate_recalc(clk->core);
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+ if (clk->core->orphan && !rate) {
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+ pr_warn("%s: clk %s: Clock is orphan and doesn't have a rate!\n",
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+ __func__, clk->core->name);
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+ goto out;
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+ }
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+
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/*
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* Since the boundaries have been changed, let's give the
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* opportunity to the provider to adjust the clock rate based on
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--- a/drivers/clk/clk_test.c
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+++ b/drivers/clk/clk_test.c
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@@ -737,6 +737,26 @@ clk_test_orphan_transparent_multiple_par
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/*
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* Test that, for a mux whose current parent hasn't been registered yet,
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+ * calling clk_set_rate_range() will succeed but won't affect its rate.
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+ */
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+static void
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+clk_test_orphan_transparent_multiple_parent_mux_set_range_get_rate(struct kunit *test)
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+{
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+ struct clk_multiple_parent_ctx *ctx = test->priv;
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+ struct clk_hw *hw = &ctx->hw;
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+ struct clk *clk = hw->clk;
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+ unsigned long rate;
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+ int ret;
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+
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+ ret = clk_set_rate_range(clk, DUMMY_CLOCK_RATE_1, DUMMY_CLOCK_RATE_2);
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+ KUNIT_ASSERT_EQ(test, ret, 0);
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+
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+ rate = clk_get_rate(clk);
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+ KUNIT_EXPECT_EQ(test, rate, 0);
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+}
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+
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+/*
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+ * Test that, for a mux whose current parent hasn't been registered yet,
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* calling clk_set_rate_range() will succeed, and will be taken into
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* account when rounding a rate.
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*/
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@@ -758,6 +778,43 @@ clk_test_orphan_transparent_multiple_par
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KUNIT_EXPECT_LE(test, rate, DUMMY_CLOCK_RATE_2);
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}
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+/*
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+ * Test that, for a mux that started orphan, was assigned and rate and
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+ * then got switched to a valid parent, its rate is eventually within
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+ * range.
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+ *
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+ * FIXME: Even though we update the rate as part of clk_set_parent(), we
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+ * don't evaluate whether that new rate is within range and needs to be
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+ * adjusted.
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+ */
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+static void
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+clk_test_orphan_transparent_multiple_parent_mux_set_range_set_parent_get_rate(struct kunit *test)
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+{
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+ struct clk_multiple_parent_ctx *ctx = test->priv;
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+ struct clk_hw *hw = &ctx->hw;
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+ struct clk *clk = hw->clk, *parent;
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+ unsigned long rate;
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+ int ret;
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+
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+ kunit_skip(test, "This needs to be fixed in the core.");
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+
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+ parent = clk_hw_get_clk(&ctx->parents_ctx[1].hw, NULL);
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+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, parent);
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+
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+ ret = clk_set_rate_range(clk, DUMMY_CLOCK_RATE_1, DUMMY_CLOCK_RATE_2);
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+ KUNIT_ASSERT_EQ(test, ret, 0);
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+
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+ ret = clk_set_parent(clk, parent);
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+ KUNIT_ASSERT_EQ(test, ret, 0);
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+
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+ rate = clk_get_rate(clk);
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+ KUNIT_ASSERT_GT(test, rate, 0);
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+ KUNIT_EXPECT_GE(test, rate, DUMMY_CLOCK_RATE_1);
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+ KUNIT_EXPECT_LE(test, rate, DUMMY_CLOCK_RATE_2);
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+
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+ clk_put(parent);
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+}
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+
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static struct kunit_case clk_orphan_transparent_multiple_parent_mux_test_cases[] = {
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KUNIT_CASE(clk_test_orphan_transparent_multiple_parent_mux_get_parent),
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KUNIT_CASE(clk_test_orphan_transparent_multiple_parent_mux_set_parent),
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@@ -766,7 +823,9 @@ static struct kunit_case clk_orphan_tran
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KUNIT_CASE(clk_test_orphan_transparent_multiple_parent_mux_set_parent_put),
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KUNIT_CASE(clk_test_orphan_transparent_multiple_parent_mux_set_parent_set_range_modified),
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KUNIT_CASE(clk_test_orphan_transparent_multiple_parent_mux_set_parent_set_range_untouched),
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+ KUNIT_CASE(clk_test_orphan_transparent_multiple_parent_mux_set_range_get_rate),
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KUNIT_CASE(clk_test_orphan_transparent_multiple_parent_mux_set_range_round_rate),
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+ KUNIT_CASE(clk_test_orphan_transparent_multiple_parent_mux_set_range_set_parent_get_rate),
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{}
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};
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