Disable and remove decoupled MMIO feature
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- v1 Latest2 patches 4 repliesIn review
Patches in v1 No applies recorded yet
| # | Subject and files | Size | Replies | Applied |
|---|---|---|---|---|
| 1/2 | drm/i915: Disable decoupled MMIOdrivers/ | +0 | 1 reply | |
| 2/2 | drm/i915: Remove decoupled MMIO codedrivers/ drivers/ drivers/ | +0 | 2 replies |
Reviews trailers per patch
All 2 patches have a Reviewed-by or Acked-by.
| Patch | Tvrtko Ursulin |
|---|---|
| 1/2 | R-b |
| 2/2 | R-b |
Trailers given in replies are filled; those carried in the patches from earlier versions are outlined with dashes.
Cover letter [PATCH 0/2] Disable and remove decoupled MMIO feature
From: Kai Chen <[email protected]>
In theory, decoupled mmio should require less cycles for single read/write operation by avoiding frequent software forcewake. However, it turns out this design not to be true on HW reality and not to provide any decoupling benefit. It also introduces problems which cause failures in intel-gpu-tools tests (gem), and also cause driver code and debugging more complex.
The patch set is organized as follows:
- Patch 1 is to disable decoupled MMIO. This patch can also be backported to other shipped kernel as a quick fix.
- Patch 2 is to totally remove implemented decoupled MMIO code on top of Patch 1.
Kai Chen (2):
drm/i915: Disable decoupled MMIO
drm/i915: Remove decoupled MMIO code
drivers/gpu/drm/i915/i915_drv.h | 3 - drivers/gpu/drm/i915/i915_pci.c | 1 - drivers/gpu/drm/i915/i915_reg.h | 7 -- drivers/gpu/drm/i915/intel_uncore.c | 126 ------------------------------------ 4 files changed, 137 deletions(-)
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