[BUG] drm/vc4: *ERROR* [PLANE:67:plane-20] flip_done timed out

[Eric Anholt]

Stefan Wahren <stefan.wahren at i2se.com> writes:

> Hi, i'm having problems while booting Raspberry Pi 1 B (Linux 4.15,
> bcm2835_defconfig) on my display, which is connected via HDMI. Mostly
> the screen stays black and i'm getting the following warnings via
> debug UART. Sometimes after disconnecting HDMI, i'm getting the
> expected screen.
>
> [    3.253930] vc4-drm soc:gpu: bound 20902000.hdmi (ops vc4_hdmi_ops)
> [    3.283413] vc4-drm soc:gpu: bound 20806000.vec (ops vc4_vec_ops)
> [    3.310306] vc4-drm soc:gpu: bound 20400000.hvs (ops vc4_hvs_ops)
> [    3.339131] vc4-drm soc:gpu: bound 20206000.pixelvalve (ops vc4_crtc_ops)
> [    3.368727] vc4-drm soc:gpu: bound 20207000.pixelvalve (ops vc4_crtc_ops)
> [    3.397935] vc4-drm soc:gpu: bound 20807000.pixelvalve (ops vc4_crtc_ops)
> [    3.450306] vc4-drm soc:gpu: bound 20c00000.v3d (ops vc4_v3d_ops)
> [    3.475686] checking generic (e330000 8ca000) vs hw (0 ffffffff)
> [    3.475700] fb: switching to vc4drmfb from simple
> [    3.499714] Console: switching to colour dummy device 80x30
> [    3.520255] [drm] Initialized vc4 0.0.0 20140616 for soc:gpu on minor 0
> [    3.527030] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
> [    3.533779] [drm] Driver supports precise vblank timestamp query.
> [    3.647269] ------------[ cut here ]------------
> [    3.647320] WARNING: CPU: 0 PID: 10 at drivers/gpu/drm/drm_atomic_helper.c:1349 drm_atomic_helper_wait_for_vblanks+0x1fc/0x21c
> [    3.647328] [CRTC:68:crtc-2] vblank wait timed out
> [    3.647333] Modules linked in:
> [    3.647354] CPU: 0 PID: 10 Comm: kworker/0:1 Not tainted 4.15.0+ #2
> [    3.647358] Hardware name: BCM2835
> [    3.647383] Workqueue: events deferred_probe_work_func
> [    3.647429] [<c010fd80>] (unwind_backtrace) from [<c010d0dc>] (show_stack+0x20/0x24)
> [    3.647459] [<c010d0dc>] (show_stack) from [<c07914f4>] (dump_stack+0x20/0x28)
> [    3.647488] [<c07914f4>] (dump_stack) from [<c011f620>] (__warn+0xec/0x104)
> [    3.647509] [<c011f620>] (__warn) from [<c011f680>] (warn_slowpath_fmt+0x48/0x50)
> [    3.647532] [<c011f680>] (warn_slowpath_fmt) from [<c044b564>] (drm_atomic_helper_wait_for_vblanks+0x1fc/0x21c)
> [    3.647556] [<c044b564>] (drm_atomic_helper_wait_for_vblanks) from [<c04815e4>] (vc4_atomic_complete_commit+0x80/0xb8)

Boris's clk series (https://patchwork.kernel.org/patch/10207161/) from
Thursday was trying to fix some of this type of failure.

> Additionally after 10 minutes there are memleaks like this:
>
> unreferenced object 0xc8cb5c00 (size 64):
>   comm "kworker/0:1", pid 10, jiffies 4294937654 (age 881.050s)
>   hex dump (first 32 bytes):
>     10 e0 ca c8 01 00 00 00 00 00 00 00 0c 5c cb c8  .............\..
>     0c 5c cb c8 ff ff ff ff 18 5c cb c8 18 5c cb c8  .\.......\...\..
>   backtrace:
>     [<7c3bc269>] kmemleak_alloc+0x78/0xc0
>     [<c58d2bd1>] kmem_cache_alloc_trace+0xfc/0x1e4
>     [<6ecb9de5>] drm_atomic_helper_setup_commit+0xa4/0x3b8
>     [<e4fdc746>] vc4_atomic_commit+0x30/0x11c
>     [<ab19bb72>] drm_atomic_commit+0x54/0x68

I expect this is just waiting for this commit to trickle in:

commit 1c6ceeee6ebbcdf9839dbce00719162591180524
Author: Leo (Sunpeng) Li <sunpeng.li at amd.com>
Date:   Wed Jan 17 12:51:08 2018 +0100

    drm/atomic: Fix memleak on ERESTARTSYS during non-blocking commits
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