linux-kernel - Re: [PATCH] drm/pl111: Initialize clock spinlock early

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Date:   Tue, 14 May 2019 18:05:29 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Eric Anholt <eric@...olt.net>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        "open list:DRM PANEL DRIVERS" <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/pl111: Initialize clock spinlock early

On 5/14/19 3:20 PM, Linus Walleij wrote:
> On Mon, May 13, 2019 at 4:46 PM Guenter Roeck <linux@...ck-us.net> wrote:
> 
>> 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>]
>>          (__lock_acquire+0x68/0x2128)
>> [<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>]
>>          (pl111_display_enable+0xf8/0x5fc)
>> [<c0536c8c>] (pl111_display_enable) from [<c0502f54>]
>>          (drm_atomic_helper_commit_modeset_enables+0x1ec/0x244)
>>
>> 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 <linus.walleij@...aro.org>
>> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> 
> Applied to drm-misc-next-fixes and pushed.
> 
> Out of curiosity: do you have a "real" Integrator/CP or is this
> QEMU?
> 

This is with qemu.

Guenter