mem-ruby: Fix deadlock in GPU VIPER TCC

A deadlock occured where we got a RdBlk while in W,
which put us in WI while we wait for a writeback to complete.

This would cause the request to be stalled while the writeback
was occuring, but when the writeback completed (WBAck), we never
woke up the requests and thus never completed the RdBlk.

This commit adds a wakeup when we receive a WBAck while in WI.

Change-Id: I01edf1d7a47757b4f680baf9f33a1a6aa37e7e25
Reviewed-by: Matt Sinclair <>
Maintainer: Matt Sinclair <>
Reviewed-by: Matthew Poremba <>
Tested-by: kokoro <>
1 file changed