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drm/radeon: do a posting read in evergreen_set_irq

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To make sure the writes go through the pci bridge.

bug:
https://bugzilla.kernel.org/show_bug.cgi?id=90741

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Alex Deucher 2015-03-02 20:42:53 -05:00
commit c320bb5f6d
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/radeon/evergreen.c
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@ -4593,6 +4593,9 @@ int evergreen_irq_set(struct radeon_device *rdev)
WREG32(AFMT_AUDIO_PACKET_CONTROL + EVERGREEN_CRTC4_REGISTER_OFFSET, afmt5);
WREG32(AFMT_AUDIO_PACKET_CONTROL + EVERGREEN_CRTC5_REGISTER_OFFSET, afmt6);
/* posting read */
RREG32(SRBM_STATUS);
return 0;
}