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| author | Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com> | 2018-10-16 15:46:47 -0700 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2018-10-17 17:46:38 +0100 |
| commit | 20fd600099754bb1d29405247c6c2b74ebc3b9f2 (patch) | |
| tree | 64828ad554640121f6b6f00eec415477c44e2fa1 /drivers/gpu/drm/drm_connector.c | |
| parent | 138bdac891831d3e86ee75a5217c9b0f001ab12b (diff) | |
| download | lwn-20fd600099754bb1d29405247c6c2b74ebc3b9f2.tar.gz lwn-20fd600099754bb1d29405247c6c2b74ebc3b9f2.zip | |
drm/i915/guc: fix GuC suspend/resume
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 <chris@chris-wilson.co.uk>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Acked-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20181016224648.2326-1-daniele.ceraolospurio@intel.com
Diffstat (limited to 'drivers/gpu/drm/drm_connector.c')
0 files changed, 0 insertions, 0 deletions