]> git.hungrycats.org Git - linux/commitdiff
drm/radeon: do a posting read in r100_set_irq
authorAlex Deucher <alexander.deucher@amd.com>
Tue, 3 Mar 2015 01:36:26 +0000 (20:36 -0500)
committerBen Hutchings <ben@decadent.org.uk>
Sat, 9 May 2015 22:16:22 +0000 (23:16 +0100)
commit f957063fee6392bb9365370db6db74dc0b2dce0a 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>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
drivers/gpu/drm/radeon/r100.c

index 76c12902ad4fa55edfbfbcff32864d466c8bbc4a..dfd12670218ce0b9c0147fea513d97be7bb69b4b 100644 (file)
@@ -688,6 +688,10 @@ 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;
 }