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| author | Alex Deucher <alexander.deucher@amd.com> | 2015-03-02 20:36:26 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-03-26 15:06:51 +0100 |
| commit | 36358b3f64dab4e9372a520901a7636cf6e01a1e (patch) | |
| tree | c3b5042d6595826f95364c91900c2541a08b3e28 /drivers/gpu/drm/radeon | |
| parent | 336163cf1efa4ecb05ce33d64e4b32c93aa10e04 (diff) | |
| download | lwn-36358b3f64dab4e9372a520901a7636cf6e01a1e.tar.gz lwn-36358b3f64dab4e9372a520901a7636cf6e01a1e.zip | |
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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/gpu/drm/radeon')
| -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 07620e198a6d..e28de20d469a 100644 --- a/drivers/gpu/drm/radeon/r100.c +++ b/drivers/gpu/drm/radeon/r100.c @@ -742,6 +742,10 @@ 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; } |