Hi Lucas,
Given that I'm not having a great success at reproducing the issue you mentioned, could you test the following patches to see if it improves things?
Thanks! Maxime
Maxime Ripard (2): ARM: dts: bcm2711: Fix the HVS size drm/vc4: hvs: Clear the HVS list at boot
arch/arm/boot/dts/bcm2711.dtsi | 1 + drivers/gpu/drm/vc4/vc4_drv.c | 1 + drivers/gpu/drm/vc4/vc4_drv.h | 1 + drivers/gpu/drm/vc4/vc4_hvs.c | 12 ++++++++++++ 4 files changed, 15 insertions(+)