> Boris Brezillon <boris.brezillon@xxxxxxxxxxx> hat am 5. Mai 2018 um 20:00 geschrieben: > > > On Sat, 5 May 2018 19:44:57 +0200 (CEST) > Stefan Wahren <stefan.wahren@xxxxxxxx> wrote: > > > Hi Stefan, > > > > > Stefan Schake <stschake@xxxxxxxxx> hat am 5. Mai 2018 um 19:29 > > > geschrieben: > > > > > > > > > On Sat, May 5, 2018 at 1:47 PM, Stefan Wahren > > > <stefan.wahren@xxxxxxxx> wrote: > > > > Hi, > > > > > > > > after submit of the latest bcm2835 clock fixes, i thought this > > > > issue has been fixed. But i've seen this issue with current > > > > mainline 4.17-rc3 (bcm2835_defconfig) on Raspberry Pi 1 B (using > > > > U-Boot TFTP Boot). Strangly i couldn't reproduce this issue with > > > > same kernel but using only the Foundation bootloader (without > > > > U-Boot TFTP Boot). > > > > > > > > U-Boot version: 2018.03 > > > > > > > > I triggered the warning using my HDMI switch: > > > > > > > > [ 198.304572] ------------[ cut here ]------------ > > > > [ 198.304693] WARNING: CPU: 0 PID: 10 at > > > > drivers/gpu/drm/drm_atomic_helper.c:1351 > > > > drm_atomic_helper_wait_for_vblanks+0x1d4/0x1f0 [ 198.304703] > > > > [CRTC:68:crtc-2] vblank wait timed out [ 198.304751] Modules > > > > linked in: bcm2835_rng rng_core vchiq(C) [ 198.304790] CPU: 0 > > > > PID: 10 Comm: kworker/0:1 Tainted: G C 4.17.0-rc3+ > > > > #1 [ 198.304796] Hardware name: BCM2835 [ 198.304817] > > > > Workqueue: events output_poll_execute [ 198.304867] [<c010f8d8>] > > > > (unwind_backtrace) from [<c010cda4>] (show_stack+0x20/0x24) > > > > [ 198.304934] [<c010cda4>] (show_stack) from [<c079ae74>] > > > > (dump_stack+0x20/0x28) [ 198.304971] [<c079ae74>] (dump_stack) > > > > from [<c011e61c>] (__warn+0xec/0x104) [ 198.305012] [<c011e61c>] > > > > (__warn) from [<c011e67c>] (warn_slowpath_fmt+0x48/0x50) > > > > [ 198.305048] [<c011e67c>] (warn_slowpath_fmt) from [<c0421638>] > > > > (drm_atomic_helper_wait_for_vblanks+0x1d4/0x1f0) [ 198.305098] > > > > [<c0421638>] (drm_atomic_helper_wait_for_vblanks) from > > > > [<c0455ce8>] (vc4_atomic_complete_commit+0x80/0xb8) > > > > [ 198.305144] [<c0455ce8>] (vc4_atomic_complete_commit) from > > > > [<c0455e30>] (vc4_atomic_commit+0x110/0x11c) [ 198.305174] > > > > [<c0455e30>] (vc4_atomic_commit) from [<c043dbac>] > > > > (drm_atomic_commit+0x50/0x60) [ 198.305202] [<c043dbac>] > > > > (drm_atomic_commit) from [<c04251e4>] > > > > (restore_fbdev_mode_atomic+0x80/0x1cc) [ 198.305228] > > > > [<c04251e4>] (restore_fbdev_mode_atomic) from [<c0426a8c>] > > > > (restore_fbdev_mode+0x38/0x144) [ 198.305270] [<c0426a8c>] > > > > (restore_fbdev_mode) from [<c0427fa8>] > > > > (drm_fb_helper_restore_fbdev_mode_unlocked+0x58/0x8c) > > > > [ 198.305296] [<c0427fa8>] > > > > (drm_fb_helper_restore_fbdev_mode_unlocked) from [<c0428030>] > > > > (drm_fb_helper_set_par+0x54/0x60) [ 198.305320] [<c0428030>] > > > > (drm_fb_helper_set_par) from [<c0427f44>] > > > > (drm_fb_helper_hotplug_event+0xc8/0xd4) [ 198.305343] > > > > [<c0427f44>] (drm_fb_helper_hotplug_event) from [<c0428078>] > > > > (drm_fb_helper_output_poll_changed+0x1c/0x20) [ 198.305382] > > > > [<c0428078>] (drm_fb_helper_output_poll_changed) from > > > > [<c0419494>] (drm_kms_helper_hotplug_event+0x34/0x38) > > > > [ 198.305409] [<c0419494>] (drm_kms_helper_hotplug_event) from > > > > [<c041963c>] (output_poll_execute+0x16c/0x17c) [ 198.305440] > > > > [<c041963c>] (output_poll_execute) from [<c01337e4>] > > > > (process_one_work+0x1e0/0x368) [ 198.305466] [<c01337e4>] > > > > (process_one_work) from [<c0134620>] (worker_thread+0x2a0/0x418) > > > > [ 198.305511] [<c0134620>] (worker_thread) from [<c0138fa8>] > > > > (kthread+0x144/0x15c) [ 198.305539] [<c0138fa8>] (kthread) from > > > > [<c01010e8>] (ret_from_fork+0x14/0x2c) [ 198.305549] Exception > > > > stack(0xc9939fb0 to 0xc9939ff8) [ 198.305562] > > > > 9fa0: 00000000 00000000 > > > > 00000000 00000000 [ 198.305578] 9fc0: 00000000 00000000 00000000 > > > > 00000000 00000000 00000000 00000000 00000000 [ 198.305591] 9fe0: > > > > 00000000 00000000 00000000 00000000 00000013 00000000 > > > > [ 198.305630] ---[ end trace 9c4071c657268b83 ]--- > > > > > > > > I also dumped clk_summary in both cases, but they were identical. > > > > > > > > Are their any helpful information, which i can provide? > > > > > > > > Best regards > > > > Stefan > > > > > > I have seen this happen with one of those cheap Waveshare HDMI > > > displays. More often when connecting its power to the RPi versus on > > > a separate supply. Goes away when using a real, proper HDMI > > > display. They come with bad EDID data so I pretty much just blamed > > > the display at the time. > > > > > > Does this happen during a switch and whats on the other end? > > > > The issue happens only in combination with U-Boot. If i switch the > > source between my PC and the RPi then sometimes the warning is > > triggered. > > Is it working despite the WARN backtrace, or do you then get a black > screen? It always works, but sometimes the screen stays a little bit (~ 6 secs) longer black before the console appears. > You say sometimes, that means sometimes it works, right? It works always, the sometimes refers to the warning. > Also, > do you remember the mode (resolution+refresh-rate) you're using? 1920 x 1080 @ 60 Hz _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
