drm/radeon: do a posting read in rs600_set_irq

[ Upstream commit 54acf107e4e66d1f4a697e08a7f60dba9fcf07c3 ]

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
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>

diff --git a/drivers/gpu/drm/radeon/rs600.c b/drivers/gpu/drm/radeon/rs600.c
index 74bce91aecc11856dd5601c1fb19326014029471..039660662ee81d319d4f667f5c1a14bc82358863 100644 (file)
--- a/drivers/gpu/drm/radeon/rs600.c
+++ b/drivers/gpu/drm/radeon/rs600.c
@@ -693,6 +693,10 @@ 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;
 }