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    Subject[PATCH 3.4 068/172] drm/radeon: do a posting read in si_set_irq
    Date
    From: Alex Deucher <alexander.deucher@amd.com>

    3.4.108-rc1 review patch. If anyone has any objections, please let me know.

    ------------------


    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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