Without async flip support in the kernel, fullscreen apps where game
resolution is equal to the screen resolution, must perform an extra blit
per frame prior to flipping.
Asynchronous page flips will also boost the FPS of Mesa benchmarks.
v2: -Few patches have been squashed and patches have been shuffled as
per the reviews on the previous version.
v3: -Few patches have been squashed and patches have been shuffled as
per the reviews on the previous version.
v4: -Made changes to fix the sequence and time stamp issue as per the
comments received on the previous version.
-Timestamps are calculated using the flip done time stamp and current
timestamp. Here I915_MODE_FLAG_GET_SCANLINE_FROM_TIMESTAMP flag is used
for timestamp calculations.
-Event is sent from the interrupt handler immediately using this
updated timestamps and sequence.
-Added more state checks as async flip should only allow change in plane
surface address and nothing else should be allowed to change.
-Added a separate plane hook for async flip.
-Need to find a way to reject fbc enabling if it comes as part of this
flip as bspec states that changes to FBC are not allowed.
v5: -Fixed the Checkpatch and sparse warnings.
v6: -Reverted back to the old timestamping code as per the feedback received.
-Added documentation.
v7: -Changes in intel_atomic_check_async()
-Add vfunc for skl_program_async_surface_address()
v8: -Add WA for older platforms with double buffered
async address update enable bit.
v9: -Changes as per feedback received on previous version.
v10: -Changes as per feedback received on previous version.
Karthik B S (8):
drm/i915: Add enable/disable flip done and flip done handler
drm/i915: Add support for async flips in I915
drm/i915: Add checks specific to async flips
drm/i915: Do not call drm_crtc_arm_vblank_event in async flips
drm/i915: Add dedicated plane hook for async flip case
drm/i915: WA for platforms with double buffered address update enable
bit
Documentation/gpu: Add asynchronous flip documentation for i915
drm/i915: Enable async flips in i915
Documentation/gpu/i915.rst | 6 +
.../gpu/drm/i915/display/intel_atomic_plane.c | 6 +-
drivers/gpu/drm/i915/display/intel_display.c | 199 ++++++++++++++++++
.../drm/i915/display/intel_display_types.h | 3 +
drivers/gpu/drm/i915/display/intel_sprite.c | 30 +++
drivers/gpu/drm/i915/i915_irq.c | 52 +++++
drivers/gpu/drm/i915/i915_irq.h | 3 +
drivers/gpu/drm/i915/i915_reg.h | 1 +
8 files changed, 299 insertions(+), 1 deletion(-)
--
2.22.0
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