[PATCH 3.14 19/79] drm/radeon: do a posting read in evergreen_set_irq

From: Greg Kroah-Hartman
Date: Tue Mar 24 2015 - 11:53:07 EST


3.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Alex Deucher <alexander.deucher@xxxxxxx>

commit c320bb5f6dc0cb88a811cbaf839303e0a3916a92 upstream.

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@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/gpu/drm/radeon/evergreen.c | 3 +++
1 file changed, 3 insertions(+)

--- a/drivers/gpu/drm/radeon/evergreen.c
+++ b/drivers/gpu/drm/radeon/evergreen.c
@@ -4596,6 +4596,9 @@ int evergreen_irq_set(struct radeon_devi
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;
}



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