Hi,
On 25.08.20 г. 16:16 ч., Tomi Valkeinen wrote:
Hi Laurent,
On 23/08/2020 19:26, Aaro Koskinen wrote:
Hi,
On Tue, Aug 04, 2020 at 03:39:37PM +0300, Tomi Valkeinen wrote:
On 04/08/2020 15:13, Tomi Valkeinen wrote:
Can you try to pinpoint a bit where the hang happens? Maybe add
DRM/omapdrm debug prints, or perhaps sysrq works and it shows a lock
that's in deadlock.
Also, one data point would be to disable venc, e.g. set venc status to
"disabled" in dts.
Disabling venc makes no difference.
The hang happens in drm_fb_helper_initial_config(). I followed the
"HANG DEBUGGING" tips in the function comment text and enabled
fb.lockless_register_fb=1 to get more (serial) console output.
Now I get this:
[ 6.514739] omapdss_dss 48050000.dss: supply vdda_video not found, using dummy regulator
[ 6.566375] DSS: OMAP DSS rev 2.0
[ 6.571807] omapdss_dss 48050000.dss: bound 48050400.dispc (ops dispc_component_ops)
[ 6.580749] omapdrm omapdrm.0: DMM not available, disable DMM support
[ 6.587982] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[ 6.626617] ------------[ cut here ]------------
[ 6.631774] WARNING: CPU: 0 PID: 18 at drivers/gpu/drm/drm_bridge.c:708 drm_atomic_helper_commit_modeset_enables+0x134/0x268
[ 6.643768] Modules linked in:
[ 6.647033] CPU: 0 PID: 18 Comm: kworker/0:1 Tainted: G U 5.8.0-omap3-los_16068+-00004-g2e7d4a7efefd-dirty #2
[ 6.658966] Hardware name: Nokia RX-51 board
[ 6.663635] Workqueue: events deferred_probe_work_func
[ 6.669097] [<c010bf18>] (unwind_backtrace) from [<c010a0f4>] (show_stack+0x10/0x14)
[ 6.677429] [<c010a0f4>] (show_stack) from [<c0124f18>] (__warn+0xbc/0xd4)
[ 6.684844] [<c0124f18>] (__warn) from [<c0124f90>] (warn_slowpath_fmt+0x60/0xb8)
[ 6.692901] [<c0124f90>] (warn_slowpath_fmt) from [<c040c0e8>] (drm_atomic_helper_commit_modeset_enables+0x134/0x268)
[ 6.704254] [<c040c0e8>] (drm_atomic_helper_commit_modeset_enables) from [<c045442c>] (omap_atomic_commit_tail+0xb4/0xc0)
[ 6.715972] [<c045442c>] (omap_atomic_commit_tail) from [<c040d1b4>] (commit_tail+0x9c/0x1a8)
[ 6.725128] [<c040d1b4>] (commit_tail) from [<c040de70>] (drm_atomic_helper_commit+0x134/0x158)
[ 6.734466] [<c040de70>] (drm_atomic_helper_commit) from [<c043b204>] (drm_client_modeset_commit_atomic+0x16c/0x208)
[ 6.745727] [<c043b204>] (drm_client_modeset_commit_atomic) from [<c043b2f8>] (drm_client_modeset_commit_locked+0x58/0x184)
[ 6.757629] [<c043b2f8>] (drm_client_modeset_commit_locked) from [<c043b448>] (drm_client_modeset_commit+0x24/0x40)
[ 6.768798] [<c043b448>] (drm_client_modeset_commit) from [<c0412778>] (__drm_fb_helper_restore_fbdev_mode_unlocked+0xa0/0xc8)
[ 6.780975] [<c0412778>] (__drm_fb_helper_restore_fbdev_mode_unlocked) from [<c0412808>] (drm_fb_helper_set_par+0x38/0x64)
[ 6.792785] [<c0412808>] (drm_fb_helper_set_par) from [<c03a9b24>] (fbcon_init+0x3d4/0x568)
[ 6.801757] [<c03a9b24>] (fbcon_init) from [<c03eaab0>] (visual_init+0xb8/0xfc)
[ 6.809631] [<c03eaab0>] (visual_init) from [<c03ec070>] (do_bind_con_driver+0x1e0/0x3bc)
[ 6.818267] [<c03ec070>] (do_bind_con_driver) from [<c03ec59c>] (do_take_over_console+0x138/0x1d8)
[ 6.827880] [<c03ec59c>] (do_take_over_console) from [<c03a856c>] (do_fbcon_takeover+0x74/0xd4)
[ 6.837219] [<c03a856c>] (do_fbcon_takeover) from [<c03a22e0>] (register_framebuffer+0x204/0x2d8)
[ 6.846740] [<c03a22e0>] (register_framebuffer) from [<c0412228>] (__drm_fb_helper_initial_config_and_unlock+0x3a4/0x554)
[ 6.858459] [<c0412228>] (__drm_fb_helper_initial_config_and_unlock) from [<c045c230>] (omap_fbdev_init+0x84/0xbc)
[ 6.869537] [<c045c230>] (omap_fbdev_init) from [<c04549b8>] (pdev_probe+0x580/0x7d8)
[ 6.877807] [<c04549b8>] (pdev_probe) from [<c04669b4>] (platform_drv_probe+0x48/0x98)
Laurent, does this ring any bells? The WARN comes in drm_atomic_bridge_chain_enable() when
drm_atomic_get_old_bridge_state() returns null for (presumably) sdi bridge.
I'm not sure why the bridge state would not be there.
Aaro, you can probably debug easier if you disable CONFIG_FRAMEBUFFER_CONSOLE, or even
CONFIG_DRM_FBDEV_EMULATION.
Tomi
Is there any progress on the issue? I tried 5.9.1 and still nothing
displayed.
Regards,
Ivo
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