pmaports/device/community/linux-postmarketos-qcom-sc7180/0011-HACK-clk-Delay-disabling-unused-clocks-by-10s.patch

From c3fccf1615be6548b50274851557f579b6320b5b Mon Sep 17 00:00:00 2001
From: Nikita Travkin <nikita@trvn.ru>
Date: Mon, 11 Mar 2024 14:53:04 +0500
Subject: [PATCH] HACK: clk: Delay disabling unused clocks by 10s

There is a forever-lasting problem with qcom clocks that causes display
subsystem crash due to "disp_cc_mdss_mdp_clk status stuck at 'off'" if
the clocks were cleaned up before msm claimed this one.

Delay disabling unused clocks by 10 seconds to work around this.

Signed-off-by: Nikita Travkin <nikita@trvn.ru>
---
 drivers/clk/clk.c | 24 ++++++++++++++++--------
 1 file changed, 16 insertions(+), 8 deletions(-)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 50228cb0c559..f0647ecca9ac 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -1347,7 +1347,7 @@ static void clk_core_disable_unprepare(struct clk_core *core)
 	clk_core_unprepare_lock(core);
 }
 
-static void __init clk_unprepare_unused_subtree(struct clk_core *core)
+static void clk_unprepare_unused_subtree(struct clk_core *core)
 {
 	struct clk_core *child;
 
@@ -1377,7 +1377,7 @@ static void __init clk_unprepare_unused_subtree(struct clk_core *core)
 	clk_pm_runtime_put(core);
 }
 
-static void __init clk_disable_unused_subtree(struct clk_core *core)
+static void clk_disable_unused_subtree(struct clk_core *core)
 {
 	struct clk_core *child;
 	unsigned long flags;
@@ -1431,15 +1431,10 @@ static int __init clk_ignore_unused_setup(char *__unused)
 }
 __setup("clk_ignore_unused", clk_ignore_unused_setup);
 
-static int __init clk_disable_unused(void)
+static void clk_disable_unused_work_function(struct work_struct *work)
 {
 	struct clk_core *core;
 
-	if (clk_ignore_unused) {
-		pr_warn("clk: Not disabling unused clocks\n");
-		return 0;
-	}
-
 	pr_info("clk: Disabling unused clocks\n");
 
 	clk_prepare_lock();
@@ -1457,6 +1452,19 @@ static int __init clk_disable_unused(void)
 		clk_unprepare_unused_subtree(core);
 
 	clk_prepare_unlock();
+}
+static DECLARE_DELAYED_WORK(clk_disable_unused_work,
+			    clk_disable_unused_work_function);
+
+static int __init clk_disable_unused(void)
+{
+	if (clk_ignore_unused) {
+		pr_warn("clk: Not disabling unused clocks\n");
+		return 0;
+	}
+
+	schedule_delayed_work(&clk_disable_unused_work,
+			      msecs_to_jiffies(10000));
 
 	return 0;
 }
-- 
2.44.0