drm/i915: Convert the forcewake worker into a timer func

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We don't want to suffer scheduling delay when turning off the GPU after
waking it up to touch registers. Ideally, we only want to keep the GPU
awake for the register access sequence, with a single forcewake dance on
the first access and release immediately after the last. We set a timer
on the first access so that we only dance once and on the next scheduler
tick, we drop the forcewake again.

This moves the cleanup routine from the common i915 workqueue to a timer
func so that we don't anger powertop, and drop the forcewake again
quicker.

v2: Enable the deferred force_wake_put for regular register reads as
    well.
v3: Beautification and make sure we disable forcewake when shutting
    down.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Ben Widawsky <ben@bwidawsk.net>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

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This commit is contained in:

Chris Wilson 2014-03-05 12:00:39 +00:00 • committed by Daniel Vetter

parent 8f94d24b7b

commit 8232644ccf

2 changed files with 17 additions and 20 deletions

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2

drivers/gpu/drm/i915/i915_drv.h

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35

drivers/gpu/drm/i915/intel_uncore.c

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