| From | lizf@kernel ... | Subject | [PATCH 3.4 064/172] drm/radeon: do a posting read in r100_set_irq | Date | Tue, 16 Jun 2015 16:35:18 +0800 |
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From: Alex Deucher <alexander.deucher@amd.com>
3.4.108-rc1 review patch. If anyone has any objections, please let me know.
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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> --- drivers/gpu/drm/radeon/r100.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/radeon/r100.c b/drivers/gpu/drm/radeon/r100.c index 40ed0e5..8ec5b85 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; } -- 1.9.1
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