LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Guenter Roeck <linux@roeck-us.net>
To: Linus Walleij <linus.walleij@linaro.org>
Cc: Eric Anholt <eric@anholt.net>, David Airlie <airlied@linux.ie>,
	Daniel Vetter <daniel@ffwll.ch>,
	"open list:DRM PANEL DRIVERS" <dri-devel@lists.freedesktop.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] drm/pl111: Initialize clock spinlock early
Date: Tue, 14 May 2019 18:05:29 -0700	[thread overview]
Message-ID: <9d4fde45-be92-f2e2-0571-f2316d036853@roeck-us.net> (raw)
In-Reply-To: <CACRpkdb6EEchXBSnO5SckGq7MY0z26Fq-=y+uJR=2_SCMC0q+Q@mail.gmail.com>

On 5/14/19 3:20 PM, Linus Walleij wrote:
> On Mon, May 13, 2019 at 4:46 PM Guenter Roeck <linux@roeck-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@linaro.org>
>> Signed-off-by: Guenter Roeck <linux@roeck-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

      reply	other threads:[~2019-05-15  1:05 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-13 14:46 Guenter Roeck
2019-05-14 22:20 ` Linus Walleij
2019-05-15  1:05   ` Guenter Roeck [this message]

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=9d4fde45-be92-f2e2-0571-f2316d036853@roeck-us.net \
    --to=linux@roeck-us.net \
    --cc=airlied@linux.ie \
    --cc=daniel@ffwll.ch \
    --cc=dri-devel@lists.freedesktop.org \
    --cc=eric@anholt.net \
    --cc=linus.walleij@linaro.org \
    --cc=linux-kernel@vger.kernel.org \
    --subject='Re: [PATCH] drm/pl111: Initialize clock spinlock early' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).