linux-kernel - [PATCH] Revert "clk: core: Honor CLK_OPS_PARENT

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Date:   Wed, 31 Aug 2022 10:53:25 -0700
From:   Stephen Boyd <sboyd@...nel.org>
To:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
        patches@...ts.linux.dev,
        Alexander Stein <alexander.stein@...tq-group.com>,
        Chen-Yu Tsai <wenst@...omium.org>
Subject: [PATCH] Revert "clk: core: Honor CLK_OPS_PARENT_ENABLE for clk gate ops"

This reverts commit 35b0fac808b95eea1212f8860baf6ad25b88b087. Alexander
reports that it causes boot failures on i.MX8M Plus based boards
(specifically imx8mp-tqma8mpql-mba8mpxl.dts).

Reported-by: Alexander Stein <alexander.stein@...tq-group.com>
Cc: Chen-Yu Tsai <wenst@...omium.org>
Fixes: 35b0fac808b9 ("clk: core: Honor CLK_OPS_PARENT_ENABLE for clk gate ops")
Link: https://lore.kernel.org/r/12115951.O9o76ZdvQC@steina-w
Signed-off-by: Stephen Boyd <sboyd@...nel.org>
---
 drivers/clk/clk.c | 28 ----------------------------
 1 file changed, 28 deletions(-)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 2e29a72c68e1..bd0b35cac83e 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -196,9 +196,6 @@ static bool clk_core_rate_is_protected(struct clk_core *core)
 	return core->protect_count;
 }
 
-static int clk_core_prepare_enable(struct clk_core *core);
-static void clk_core_disable_unprepare(struct clk_core *core);
-
 static bool clk_core_is_prepared(struct clk_core *core)
 {
 	bool ret = false;
@@ -211,11 +208,7 @@ static bool clk_core_is_prepared(struct clk_core *core)
 		return core->prepare_count;
 
 	if (!clk_pm_runtime_get(core)) {
-		if (core->flags & CLK_OPS_PARENT_ENABLE)
-			clk_core_prepare_enable(core->parent);
 		ret = core->ops->is_prepared(core->hw);
-		if (core->flags & CLK_OPS_PARENT_ENABLE)
-			clk_core_disable_unprepare(core->parent);
 		clk_pm_runtime_put(core);
 	}
 
@@ -251,13 +244,7 @@ static bool clk_core_is_enabled(struct clk_core *core)
 		}
 	}
 
-	if (core->flags & CLK_OPS_PARENT_ENABLE)
-		clk_core_prepare_enable(core->parent);
-
 	ret = core->ops->is_enabled(core->hw);
-
-	if (core->flags & CLK_OPS_PARENT_ENABLE)
-		clk_core_disable_unprepare(core->parent);
 done:
 	if (core->rpm_enabled)
 		pm_runtime_put(core->dev);
@@ -825,9 +812,6 @@ int clk_rate_exclusive_get(struct clk *clk)
 }
 EXPORT_SYMBOL_GPL(clk_rate_exclusive_get);
 
-static int clk_core_enable_lock(struct clk_core *core);
-static void clk_core_disable_lock(struct clk_core *core);
-
 static void clk_core_unprepare(struct clk_core *core)
 {
 	lockdep_assert_held(&prepare_lock);
@@ -851,18 +835,12 @@ static void clk_core_unprepare(struct clk_core *core)
 
 	WARN(core->enable_count > 0, "Unpreparing enabled %s\n", core->name);
 
-	if (core->flags & CLK_OPS_PARENT_ENABLE)
-		clk_core_enable_lock(core->parent);
-
 	trace_clk_unprepare(core);
 
 	if (core->ops->unprepare)
 		core->ops->unprepare(core->hw);
 
 	trace_clk_unprepare_complete(core);
-
-	if (core->flags & CLK_OPS_PARENT_ENABLE)
-		clk_core_disable_lock(core->parent);
 	clk_core_unprepare(core->parent);
 	clk_pm_runtime_put(core);
 }
@@ -912,9 +890,6 @@ static int clk_core_prepare(struct clk_core *core)
 		if (ret)
 			goto runtime_put;
 
-		if (core->flags & CLK_OPS_PARENT_ENABLE)
-			clk_core_enable_lock(core->parent);
-
 		trace_clk_prepare(core);
 
 		if (core->ops->prepare)
@@ -922,9 +897,6 @@ static int clk_core_prepare(struct clk_core *core)
 
 		trace_clk_prepare_complete(core);
 
-		if (core->flags & CLK_OPS_PARENT_ENABLE)
-			clk_core_disable_lock(core->parent);
-
 		if (ret)
 			goto unprepare;
 	}
-- 
https://git.kernel.org/pub/scm/linux/kernel/git/clk/linux.git/
https://git.kernel.org/pub/scm/linux/kernel/git/sboyd/spmi.git