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authorAlex Deucher <alexander.deucher@amd.com>2015-03-02 20:39:56 -0500
committerAlex Deucher <alexander.deucher@amd.com>2015-03-03 17:28:27 -0500
commit54acf107e4e66d1f4a697e08a7f60dba9fcf07c3 (patch)
tree17a836dff118f24a537ed35fe172b1e0b4c2256d /drivers/gpu
parentf957063fee6392bb9365370db6db74dc0b2dce0a (diff)
drm/radeon: do a posting read in rs600_set_irq
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
Diffstat (limited to 'drivers/gpu')
-rw-r--r--drivers/gpu/drm/radeon/rs600.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/gpu/drm/radeon/rs600.c b/drivers/gpu/drm/radeon/rs600.c
index d81182ad53ec..97a904835759 100644
--- a/drivers/gpu/drm/radeon/rs600.c
+++ b/drivers/gpu/drm/radeon/rs600.c
@@ -694,6 +694,10 @@ int rs600_irq_set(struct radeon_device *rdev)
WREG32(R_007D18_DC_HOT_PLUG_DETECT2_INT_CONTROL, hpd2);
if (ASIC_IS_DCE2(rdev))
WREG32(R_007408_HDMI0_AUDIO_PACKET_CONTROL, hdmi0);
+
+ /* posting read */
+ RREG32(R_000040_GEN_INT_CNTL);
+
return 0;
}