drm: Bogus WARN() in drm_atomic_helper_update_legacy_modeset_state() ?

[Mark yao]

On 2015年11月11日 00:56, Thierry Reding wrote:
> On Tue, Nov 10, 2015 at 03:01:03PM +0000, Liviu Dudau wrote:
>> Hello,
>>
>> When booting my Juno board with the HDLCD driver that I have converted to
>> atomic operations I'm getting the following warning:
> Perhaps you can provide pointers to the source code, that might make it
> easier for people to spot what's going wrong.
>
> Thierry
>
>
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Hi Thierry
     I encountered the same problem as Liviu.
     I'm coverting rockchip drm to atomic api, when booting with hdmi 
connected, get under warning:

[    1.300156] WARNING: CPU: 0 PID: 26 at 
drivers/gpu/drm/drm_atomic_helper.c:674 
drm_atomic_helper_update_legacy_modeset_state+0x3c/0x1f8()
[    1.300161] Modules linked in:
[    1.300171] CPU: 0 PID: 26 Comm: kworker/0:1 Not tainted 4.3.0-rc5+ #160
[    1.300174] Hardware name: Rockchip (Device Tree)
[    1.300189] Workqueue: events output_poll_execute
[    1.300224] [<c0015e54>] (unwind_backtrace) from [<c00123cc>] 
(show_stack+0x10/0x14)
[    1.300241] [<c00123cc>] (show_stack) from [<c01a5980>] 
(dump_stack+0x6c/0x88)
[    1.300255] [<c01a5980>] (dump_stack) from [<c0024050>] 
(warn_slowpath_common+0x80/0xa8)
[    1.300265] [<c0024050>] (warn_slowpath_common) from [<c0024090>] 
(warn_slowpath_null+0x18/0x1c)
[    1.300277] [<c0024090>] (warn_slowpath_null) from [<c0221184>] 
(drm_atomic_helper_update_legacy_modeset_state+0x3c/0x1f8)
[    1.300293] [<c0221184>] 
(drm_atomic_helper_update_legacy_modeset_state) from [<c0221548>] 
(drm_atomic_helper_commit_modeset_disables+0x208/0x364)
[    1.300305] [<c0221548>] (drm_atomic_helper_commit_modeset_disables) 
from [<c0222248>] (drm_atomic_helper_commit+0xf8/0x140)
[    1.300320] [<c0222248>] (drm_atomic_helper_commit) from [<c02404cc>] 
(drm_atomic_commit+0x50/0x60)
[    1.300333] [<c02404cc>] (drm_atomic_commit) from [<c0223180>] 
(restore_fbdev_mode+0xf4/0x278)
[    1.300345] [<c0223180>] (restore_fbdev_mode) from [<c0224164>] 
(drm_fb_helper_restore_fbdev_mode_unlocked+0x30/0x68)
[    1.300357] [<c0224164>] (drm_fb_helper_restore_fbdev_mode_unlocked) 
from [<c02241d8>] (drm_fb_helper_set_par+0x3c/0x54)
[    1.300368] [<c02241d8>] (drm_fb_helper_set_par) from [<c022411c>] 
(drm_fb_helper_hotplug_event+0xe4/0xfc)
[    1.300382] [<c022411c>] (drm_fb_helper_hotplug_event) from 
[<c021ade8>] (drm_kms_helper_hotplug_event+0x24/0x28)
[    1.300396] [<c021ade8>] (drm_kms_helper_hotplug_event) from 
[<c021af20>] (output_poll_execute+0x134/0x18c)
[    1.300413] [<c021af20>] (output_poll_execute) from [<c00377c0>] 
(process_one_work+0x1e0/0x318)
[    1.300426] [<c00377c0>] (process_one_work) from [<c0037c70>] 
(worker_thread+0x378/0x4c4)
[    1.300438] [<c0037c70>] (worker_thread) from [<c003c69c>] 
(kthread+0xdc/0xf0)
[    1.300450] [<c003c69c>] (kthread) from [<c000f5d8>] 
(ret_from_fork+0x14/0x3c)

I can't found who can set encoder->crtc value before atomic_commit, 
what's going wrong?

-- 
Ｍark Yao

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