| From | lizf@kernel ... | Subject | [PATCH 3.4 068/172] drm/radeon: do a posting read in si_set_irq | Date | Tue, 16 Jun 2015 16:35:22 +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 0586915ec10d0ae60de5cd3381ad25a704760402 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/si.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/gpu/drm/radeon/si.c b/drivers/gpu/drm/radeon/si.c index e710073..068b21f 100644 --- a/drivers/gpu/drm/radeon/si.c +++ b/drivers/gpu/drm/radeon/si.c @@ -4126,6 +4126,9 @@ int si_init(struct radeon_device *rdev) return -EINVAL; } + /* posting read */ + RREG32(SRBM_STATUS); + return 0; } -- 1.9.1
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