[i915]] *ERROR* mismatch in scaler_state.scaler_id

[Konduru, Chandra]

Hi,
This error happens when crtc_state in driver not matching with hardware registers.
On skylake board that I have, I am not able to reproduce the issue.
Can you send the system configuration and steps to reproduce the issue?
Also can you send the full dmesg.log file?

-Chandra

> -----Original Message-----
> From: Daniel Vetter [mailto:daniel.vetter at ffwll.ch] On Behalf Of Daniel Vetter
> Sent: Wednesday, May 06, 2015 4:09 AM
> To: Sergey Senozhatsky
> Cc: David Airlie; Vetter, Daniel; intel-gfx at lists.freedesktop.org; dri-
> devel at lists.freedesktop.org; linux-kernel at vger.kernel.org; Konduru, Chandra
> Subject: Re: [i915]] *ERROR* mismatch in scaler_state.scaler_id
> 
> Adding Chandra, who's implemented skl scaler code.
> -Daniel
> 
> On Sat, May 02, 2015 at 10:05:42AM +0900, Sergey Senozhatsky wrote:
> > Hi,
> >
> > linux-next 20150501
> >
> > [    1.968953] [drm:check_crtc_state [i915]] *ERROR* mismatch in
> scaler_state.scaler_id (expected 0, found -1)
> > [    1.968953] ------------[ cut here ]------------
> > [    1.968983] WARNING: CPU: 0 PID: 6 at
> drivers/gpu/drm/i915/intel_display.c:12008 check_crtc_state+0xb15/0xb83
> [i915]()
> > [    1.968983] pipe state doesn't match!
> > [..]
> > [    1.969005] CPU: 0 PID: 6 Comm: kworker/u16:0 Not tainted 4.1.0-rc1-next-
> 20150501-dbg-00011-gbcb7bed-dirty #49
> > [    1.969010] Workqueue: events_unbound async_run_entry_fn
> > [    1.969012]  0000000000000009 ffff88041d9eb448 ffffffff812e9753
> 0000000000005555
> > [    1.969013]  ffff88041d9eb498 ffff88041d9eb488 ffffffff81034c24
> ffff88041d9eb490
> > [    1.969015]  ffffffffa03a81dc ffff88041d123000 ffff88041cbbc800
> 0000000000000001
> > [    1.969015] Call Trace:
> > [    1.969019]  [<ffffffff812e9753>] dump_stack+0x45/0x57
> > [    1.969022]  [<ffffffff81034c24>] warn_slowpath_common+0x97/0xb1
> > [    1.969050]  [<ffffffffa03a81dc>] ? check_crtc_state+0xb15/0xb83 [i915]
> > [    1.969052]  [<ffffffff81034c7f>] warn_slowpath_fmt+0x41/0x43
> > [    1.969080]  [<ffffffffa03a81dc>] check_crtc_state+0xb15/0xb83 [i915]
> > [    1.969082]  [<ffffffff81054941>] ? update_curr+0x68/0xd1
> > [    1.969112]  [<ffffffffa03b6ab6>] intel_modeset_check_state+0x603/0xa3d
> [i915]
> > [    1.969140]  [<ffffffffa03b7db5>] intel_crtc_set_config+0x8dc/0xc02 [i915]
> > [    1.969147]  [<ffffffffa0310d51>] ?
> drm_atomic_helper_plane_set_property+0x6c/0xa4 [drm_kms_helper]
> > [    1.969159]  [<ffffffffa02688d2>] drm_mode_set_config_internal+0x57/0xe3
> [drm]
> > [    1.969164]  [<ffffffffa03122fa>] restore_fbdev_mode+0xb5/0xcf
> [drm_kms_helper]
> > [    1.969169]  [<ffffffffa0313bb3>]
> drm_fb_helper_restore_fbdev_mode_unlocked+0x22/0x59 [drm_kms_helper]
> > [    1.969173]  [<ffffffffa0313c1b>] drm_fb_helper_set_par+0x31/0x35
> [drm_kms_helper]
> > [    1.969202]  [<ffffffffa03c4151>] intel_fbdev_set_par+0x15/0x58 [i915]
> > [    1.969204]  [<ffffffff811a3577>] fbcon_init+0x323/0x431
> > [    1.969206]  [<ffffffff811ef80a>] visual_init+0xb7/0x10d
> > [    1.969208]  [<ffffffff811f0e26>] do_bind_con_driver+0x1b1/0x2d8
> > [    1.969209]  [<ffffffff811f124f>] do_take_over_console+0x15a/0x184
> > [    1.969212]  [<ffffffff811a15e7>] do_fbcon_takeover+0x5b/0x97
> > [    1.969213]  [<ffffffff811a4dc5>] fbcon_event_notify+0x419/0x740
> > [    1.969215]  [<ffffffff810492cc>] notifier_call_chain+0x3b/0x5f
> > [    1.969217]  [<ffffffff8104950a>] __blocking_notifier_call_chain+0x43/0x5f
> > [    1.969219]  [<ffffffff81049535>] blocking_notifier_call_chain+0xf/0x11
> > [    1.969220]  [<ffffffff811a68f8>] fb_notifier_call_chain+0x16/0x18
> > [    1.969222]  [<ffffffff811a8134>] register_framebuffer+0x28f/0x2c7
> > [    1.969250]  [<ffffffffa03c45a3>] ? intelfb_create+0x2e7/0x38a [i915]
> > [    1.969256]  [<ffffffffa0313eb6>] drm_fb_helper_initial_config+0x297/0x3e1
> [drm_kms_helper]
> > [    1.969284]  [<ffffffffa03c4a9a>] intel_fbdev_initial_config+0x16/0x18
> [i915]
> > [    1.969286]  [<ffffffff8104a177>] async_run_entry_fn+0x33/0xca
> > [    1.969288]  [<ffffffff8104408c>] process_one_work+0x192/0x2a8
> > [    1.969290]  [<ffffffff81044be8>] worker_thread+0x266/0x34c
> > [    1.969291]  [<ffffffff81044982>] ? rescuer_thread+0x276/0x276
> > [    1.969293]  [<ffffffff81048908>] kthread+0xcd/0xd5
> > [    1.969294]  [<ffffffff8104883b>] ? kthread_worker_fn+0x130/0x130
> > [    1.969296]  [<ffffffff812ed5c2>] ret_from_fork+0x42/0x70
> > [    1.969297]  [<ffffffff8104883b>] ? kthread_worker_fn+0x130/0x130
> > [    1.969298] ---[ end trace 7f37d8e5ab4ee0a8 ]---
> >
> > 	-ss
> > _______________________________________________
> > dri-devel mailing list
> > dri-devel at lists.freedesktop.org
> > http://lists.freedesktop.org/mailman/listinfo/dri-devel
> 
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch