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Change History

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

drm/amd/display: prevent hang on link training fail

[Why]
When link training fails, the phy clock will be disabled. However, in
enable_streams, it is assumed that link training succeeded and the
mux selects the phy clock, causing a hang when a register write is made.

[How]
When enable_stream is hit, check if link training failed. If it did, fall
back to the ref clock to avoid a hang and keep the system in a recoverable
state.

https://git.kernel.org/stable/c/0363c03672cd3191f037905bf981eb523a3b71b1

https://git.kernel.org/stable/c/04bf4f2a497e9877c425c5124652e61fb8a1a0aa

https://git.kernel.org/stable/c/8058061ed9d6bc259d1e678607b07d259342c08f