Hi,
On Wed, Nov 17, 2021 at 03:08:31PM +0800, Jian-Hong Pan wrote:
Maxime Ripard maxime@cerno.tech 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