[PATCH 3.14 21/79] drm/radeon: do a posting read in r600_set_irq

From: Greg Kroah-Hartman
Date: Tue Mar 24 2015 - 13:00:30 EST


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

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

From: Alex Deucher <alexander.deucher@xxxxxxx>

commit 9d1393f23d5656cdd5f368efd60694d4aeed81d3 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/r600.c | 3 +++
1 file changed, 3 insertions(+)

--- a/drivers/gpu/drm/radeon/r600.c
+++ b/drivers/gpu/drm/radeon/r600.c
@@ -3647,6 +3647,9 @@ int r600_irq_set(struct radeon_device *r
WREG32(RV770_CG_THERMAL_INT, thermal_int);
}

+ /* posting read */
+ RREG32(R_000E50_SRBM_STATUS);
+
return 0;
}



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