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drm/radeon: do a posting read in r100_set_irq
author
Alex Deucher
<alexander.deucher@amd.com>
Tue, 3 Mar 2015 01:36:26 +0000
(20:36 -0500)
committer
Alex Deucher
<alexander.deucher@amd.com>
Tue, 3 Mar 2015 22:28:26 +0000
(17:28 -0500)
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
drivers/gpu/drm/radeon/r100.c
patch
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diff --git
a/drivers/gpu/drm/radeon/r100.c
b/drivers/gpu/drm/radeon/r100.c
index
279801c
..
04f2514
100644
(file)
--- a/
drivers/gpu/drm/radeon/r100.c
+++ b/
drivers/gpu/drm/radeon/r100.c
@@
-728,6
+728,10
@@
int r100_irq_set(struct radeon_device *rdev)
tmp |= RADEON_FP2_DETECT_MASK;
}
WREG32(RADEON_GEN_INT_CNTL, tmp);
+
+ /* read back to post the write */
+ RREG32(RADEON_GEN_INT_CNTL);
+
return 0;
}