[Intel-gfx] [PATCH 0/2] Disable and remove decoupled MMIO feature
kai.chen at intel.com
kai.chen at intel.com
Tue May 23 21:58:10 UTC 2017
From: Kai Chen <kai.chen at intel.com>
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(-)
--
2.9.3
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