| From | lizf@kernel ... | Subject | [PATCH 3.4 066/172] drm/radeon: do a posting read in r600_set_irq | Date | Tue, 16 Jun 2015 16:35:20 +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 9d1393f23d5656cdd5f368efd60694d4aeed81d3 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/r600.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/gpu/drm/radeon/r600.c b/drivers/gpu/drm/radeon/r600.c index 1555cd6..9c7062d 100644 --- a/drivers/gpu/drm/radeon/r600.c +++ b/drivers/gpu/drm/radeon/r600.c @@ -3184,6 +3184,9 @@ int r600_irq_set(struct radeon_device *rdev) WREG32(DC_HOT_PLUG_DETECT3_INT_CONTROL, hpd3); } + /* posting read */ + RREG32(R_000E50_SRBM_STATUS); + return 0; } -- 1.9.1
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