In the Linux kernel, the following vulnerability has been resolved:

drm/vc4: hdmi: Avoid hang with debug registers when suspended

Trying to read /sys/kernel/debug/dri/1/hdmi1_regs
when the hdmi is disconnected results in a fatal system hang.

This is due to the pm suspend code disabling the dvp clock.
That is just a gate of the 108MHz clock in DVP_HT_RPI_MISC_CONFIG,
which results in accesses hanging AXI bus.

Protect against this.

References

• https://nvd.nist.gov/vuln/detail/CVE-2024-56683
• https://git.kernel.org/stable/c/0ea29bd7d9400d3629683244d609358ed1b12075
• https://git.kernel.org/stable/c/16f351adf733a182224ad24916d7673aa6df02df
• https://git.kernel.org/stable/c/223ee2567a55e4f80315c768d2969e6a3b9fb23d
• https://git.kernel.org/stable/c/74f21be9990a42dc2357bcf87a13e16c6998b90e
• https://git.kernel.org/stable/c/c7d474974954d9af7e0092021223d58f2de128df