On Wed, 17 Oct 2018 00:46:47 +0200, Daniele Ceraolo Spurio
<daniele.ceraolospu...@intel.com> wrote:
The ENTER/EXIT_S_STATE actions queue the save/restore operation in GuC
FW and then return, so waiting on the H2G is not enough to guarantee
GuC is done.
When all the processing is done, GuC writes 0 to scratch register 14,
so we can poll on that. Note that GuC does not ensure that the value
in the register is different from 0 while the action is in progress
so we need to take care of that ourselves as well.
v2: improve comment, return early on GuC error and improve error
message (Michal)
Cc: Chris Wilson <ch...@chris-wilson.co.uk>
Cc: Michal Wajdeczko <michal.wajdec...@intel.com>
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospu...@intel.com>
Acked-by: Chris Wilson <ch...@chris-wilson.co.uk>
---
Reviewed-by: Michal Wajdeczko <michal.wajdec...@intel.com>
Michal
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