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| author | Alex Deucher <alexander.deucher@amd.com> | 2015-03-03 04:36:26 +0300 |
|---|---|---|
| committer | Zefan Li <lizefan@huawei.com> | 2015-06-19 06:40:20 +0300 |
| commit | e653b3ede2c327db4310f8053286521e471c9c0a (patch) | |
| tree | d7a277b0d5af6cccbaa75f7714288377b4ba6f05 | |
| parent | ba4e25ac180d5903320c42e4ef792e86c406fbfb (diff) | |
| download | linux-e653b3ede2c327db4310f8053286521e471c9c0a.tar.xz | |
drm/radeon: do a posting read in r100_set_irq
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: Zefan Li <lizefan@huawei.com>
| -rw-r--r-- | drivers/gpu/drm/radeon/r100.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/gpu/drm/radeon/r100.c b/drivers/gpu/drm/radeon/r100.c index 40ed0e5b95a3..8ec5b8553873 100644 --- a/drivers/gpu/drm/radeon/r100.c +++ b/drivers/gpu/drm/radeon/r100.c @@ -726,6 +726,10 @@ 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; } |