Hi,
On Wed, Nov 17, 2021 at 03:08:31PM +0800, Jian-Hong Pan wrote:
> Maxime Ripard <maxime@xxxxxxxxxx> 於 2021年11月15日 週一 下午7:31寫道：
> >
> > Hi,
> >
> > The conversion to DRM commit helpers (f3c420fe19f8, "drm/vc4: kms: Convert to
> > atomic helpers") introduced a number of issues in corner cases, most of them
> > showing themselves in the form of either a vblank timeout or use-after-free
> > error.
> >
> > These patches should fix most of them, some of them still being debugged.
> >
> > Maxime
> >
> > Maxime Ripard (6):
> > drm/vc4: kms: Wait for the commit before increasing our clock rate
> > drm/vc4: kms: Fix return code check
> > drm/vc4: kms: Add missing drm_crtc_commit_put
> > drm/vc4: kms: Clear the HVS FIFO commit pointer once done
> > drm/vc4: kms: Don't duplicate pending commit
> > drm/vc4: kms: Fix previous HVS commit wait
> >
> > drivers/gpu/drm/vc4/vc4_kms.c | 36 ++++++++++++++---------------------
> > 1 file changed, 14 insertions(+), 22 deletions(-)
> >
> > --
> > 2.33.1
> >
>
> Thanks to Maxime's information!
>
> I tried to applied this patch series based on the latest mainline
> kernel at commit commit 8ab774587903 ("Merge tag 'trace-v5.16-5' of
> git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace"),
> which almost equals "tags/v5.16-rc1" and tested it on RPi 4B.
> However, the system hangs and becomes dead at the kernel message:
>
> [drm] Initialized vc4 0.0.0 20140616 for gpu on minor 0
>
> The full dmesg can be found at
> https://bugzilla.kernel.org/attachment.cgi?id=299603
>
> If I revert the patch series to the original mainline kernel, system
> can boot up.
Can you share a bit more information on the boot setup you have? Do you
have a display connected? If so, on both output or just a single one?
Thanks!
Maxime
