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(parent: df07d69) | patch
drm/radeon: Do an MMIO read on interrupts when not uisng MSIs
authorBenjamin Herrenschmidt <benh@kernel.crashing.org>
Wed, 13 Jul 2011 06:28:22 +0000 (06:28 +0000)
committerDave Airlie <airlied@redhat.com>
Mon, 25 Jul 2011 11:16:25 +0000 (12:16 +0100)
commitf6a5693976fbc8e9fe4dde3040820082593c1757
treedfbe75b52e4f7c8d5b8d12cd9a6433ea91bfe57ftree | snapshot
parentdf07d6999e4e502ff474eeafe11ea0055f4cd68dcommit | diff
drm/radeon: Do an MMIO read on interrupts when not uisng MSIs

When not using MSIs, there is no guarantee that DMA from the device
has been fully flushed to point where it's visible to the CPU when
taking an interrupt. To get this guarantee, we need to perform an
MMIO read from the device, which will flush all outstanding DMAs
from bridges between the device and the system.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>
drivers/gpu/drm/radeon/r600.c diff | blob | history
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