Maxime Ripard <maxime@xxxxxxxxxx> 於 2021年11月18日 週四 下午6:40寫道： > > On Thu, Nov 18, 2021 at 02:42:58PM +0800, Jian-Hong Pan wrote: > > Maxime Ripard <maxime@xxxxxxxxxx> 於 2021年11月17日 週三 下午5:45寫道： > > > 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 > > > > > > Changes from v1: > > > - Prevent a null pointer dereference > > > > > > 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 | 42 ++++++++++++++++------------------- > > > 1 file changed, 19 insertions(+), 23 deletions(-) > > > > I tested the v2 patches based on latest mainline kernel with RPi 4B. > > System can boot up into desktop environment. > > So the thing that was broken initially isn't anymore? No. It does not appear anymore. > > Although it still hit the bug [1], which might be under debugging, I > > think these patches LGTM. > > The vblank timeout stuff is a symptom of various different bugs. Can you > share your setup, your config.txt, and what you're doing to trigger it? I get the RPi boot firmware files from raspberrypi's repository at tag 1.20211029 [1] And, make system boots: RPi firmware -> U-Boot -> Linux kernel (aarch64) with corresponding DTB The config.txt only has: enable_uart=1 arm_64bit=1 kernel=uboot.bin This bug can be reproduced with es2gears command easily. May need to wait it running a while. Mesa: 21.2.2 libdrm: 2.4.107 xserver/wayland: 1.20.11 Using wayland This bug happens with direct boot path as well: RPi firmware -> Linux kernel (aarch64) with corresponding DTB I tried with Endless OS and Ubuntu's RPi 4B images. An easy setup is using Ubuntu 21.10 RPi 4B image [2]. Then, replace the kernel & device tree blob and edit the config.txt. [1] https://github.com/raspberrypi/firmware/tree/1.20211029/boot [2] https://ubuntu.com/download/raspberry-pi Jian-Hong Pan > > [1] https://bugzilla.kernel.org/show_bug.cgi?id=214991 > > > > Tested-by: Jian-Hong Pan <jhp@xxxxxxxxxxxxx> > > Thanks! > Maxime
