drm/i915: use gmbus irq to wait for gmbus idle

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GMBUS_ACTIVE has inverted sense and so doesn't fit into the
wait_hw_status helper, hence create a new gmbus_wait_idle functions.
Also, we only care about the idle irq event and nothing else, which
allows us to use the wait_event_timeout helper directly without
jumping through hoops to catch NAKs.

Since gen2/3 don't have gmbus interrupts, handle them separately with
the old wait_for macro.

This shaves another few ms off reading EDID from a hdmi screen on my
testbox here. EDID reading with interrupt driven gmbus is now as fast
as with busy-looping gmbus at 28 ms here (with negligible cpu
overhead).

Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

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This commit is contained in:

Daniel Vetter 2012-12-01 13:53:46 +01:00

parent 28c70f162a

commit 2c438c0273

1 changed files with 28 additions and 4 deletions

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drivers/gpu/drm/i915/intel_i2c.c

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