| From | lizf@kernel ... | Subject | [PATCH 3.4 065/172] drm/radeon: do a posting read in rs600_set_irq | Date | Tue, 16 Jun 2015 16:35:19 +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 54acf107e4e66d1f4a697e08a7f60dba9fcf07c3 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> [lizf: Backported to 3.4: adjust context] Signed-off-by: Zefan Li <lizefan@huawei.com> --- drivers/gpu/drm/radeon/rs600.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/radeon/rs600.c b/drivers/gpu/drm/radeon/rs600.c index 739eb0d..07b6dbf 100644 --- a/drivers/gpu/drm/radeon/rs600.c +++ b/drivers/gpu/drm/radeon/rs600.c @@ -585,6 +585,10 @@ int rs600_irq_set(struct radeon_device *rdev) WREG32(R_006540_DxMODE_INT_MASK, mode_int); WREG32(R_007D08_DC_HOT_PLUG_DETECT1_INT_CONTROL, hpd1); WREG32(R_007D18_DC_HOT_PLUG_DETECT2_INT_CONTROL, hpd2); + + /* posting read */ + RREG32(R_000040_GEN_INT_CNTL); + return 0; } -- 1.9.1
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