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From: Guenter Roeck <>
To: Eric Anholt <>
Cc: David Airlie <>, Daniel Vetter <>,,,
	Guenter Roeck <>,
	Linus Walleij <>
Subject: [PATCH] drm/pl111: Initialize clock spinlock early
Date: Mon, 13 May 2019 07:46:21 -0700	[thread overview]
Message-ID: <> (raw)

The following warning is seen on systems with broken clock divider.

INFO: trying to register non-static key.
the code is fine but needs lockdep annotation.
turning off the locking correctness validator.
CPU: 0 PID: 1 Comm: swapper Not tainted 5.1.0-09698-g1fb3b52 #1
Hardware name: ARM Integrator/CP (Device Tree)
[<c0011be8>] (unwind_backtrace) from [<c000ebb8>] (show_stack+0x10/0x18)
[<c000ebb8>] (show_stack) from [<c07d3fd0>] (dump_stack+0x18/0x24)
[<c07d3fd0>] (dump_stack) from [<c0060d48>] (register_lock_class+0x674/0x6f8)
[<c0060d48>] (register_lock_class) from [<c005de2c>]
[<c005de2c>] (__lock_acquire) from [<c0060408>] (lock_acquire+0x110/0x21c)
[<c0060408>] (lock_acquire) from [<c07f755c>] (_raw_spin_lock+0x34/0x48)
[<c07f755c>] (_raw_spin_lock) from [<c0536c8c>]
[<c0536c8c>] (pl111_display_enable) from [<c0502f54>]

Since commit eedd6033b4c8 ("drm/pl111: Support variants with broken clock
divider"), the spinlock is not initialized if the clock divider is broken.
Initialize it earlier to fix the problem.

Fixes: eedd6033b4c8 ("drm/pl111: Support variants with broken clock divider")
Cc: Linus Walleij <>
Signed-off-by: Guenter Roeck <>
 drivers/gpu/drm/pl111/pl111_display.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/pl111/pl111_display.c b/drivers/gpu/drm/pl111/pl111_display.c
index 0c5d391f0a8f..4501597f30ab 100644
--- a/drivers/gpu/drm/pl111/pl111_display.c
+++ b/drivers/gpu/drm/pl111/pl111_display.c
@@ -531,14 +531,15 @@ pl111_init_clock_divider(struct drm_device *drm)
 		dev_err(drm->dev, "CLCD: unable to get clcdclk.\n");
 		return PTR_ERR(parent);
+	spin_lock_init(&priv->tim2_lock);
 	/* If the clock divider is broken, use the parent directly */
 	if (priv->variant->broken_clockdivider) {
 		priv->clk = parent;
 		return 0;
 	parent_name = __clk_get_name(parent);
-	spin_lock_init(&priv->tim2_lock);
 	div->init = &init;
 	ret = devm_clk_hw_register(drm->dev, div);

             reply	other threads:[~2019-05-13 14:46 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-13 14:46 Guenter Roeck [this message]
2019-05-14 22:20 ` [PATCH] drm/pl111: Initialize clock spinlock early Linus Walleij
2019-05-14 22:20   ` Linus Walleij
2019-05-15  1:05   ` Guenter Roeck

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