drm/radeon: do a posting read in rs600_set_irq
authorAlex Deucher <alexander.deucher@amd.com>
Tue, 3 Mar 2015 01:39:56 +0000 (20:39 -0500)
committerAlex Deucher <alexander.deucher@amd.com>
Tue, 3 Mar 2015 22:28:27 +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/rs600.c

index d81182ad53ec6920b4f7027595882cebf26cdcfc..97a904835759f7876b2b69be104493cf302554a7 100644 (file)
@@ -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;
 }