drm/radeon: do a posting read in rs600_set_irq

commit 54acf107e4e66d1f4a697e08a7f60dba9fcf07c3 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@amd.com>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/gpu/drm/radeon/rs600.c b/drivers/gpu/drm/radeon/rs600.c
index dc00155..fc37558 100644 (file)
--- a/drivers/gpu/drm/radeon/rs600.c
+++ b/drivers/gpu/drm/radeon/rs600.c
@@ -576,6 +576,10 @@ int rs600_irq_set(struct radeon_device *rdev)
        WREG32(R_006540_DxMODE_INT_MASK, mode_int);
        WREG32(R_007D08_DC_HOT_PLUG_DETECT1_INT_CONTROL, hpd1);
        WREG32(R_007D18_DC_HOT_PLUG_DETECT2_INT_CONTROL, hpd2);
+
+       /* posting read */
+       RREG32(R_000040_GEN_INT_CNTL);
+
        return 0;
 }