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    Subject[PATCH 3.16.y-ckt 077/165] drm/radeon: do a posting read in evergreen_set_irq
    Date
    3.16.7-ckt9 -stable review patch.  If anyone has any objections, please let me know.

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

    From: Alex Deucher <alexander.deucher@amd.com>

    commit c320bb5f6dc0cb88a811cbaf839303e0a3916a92 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: Luis Henriques <luis.henriques@canonical.com>
    ---
    drivers/gpu/drm/radeon/evergreen.c | 3 +++
    1 file changed, 3 insertions(+)

    diff --git a/drivers/gpu/drm/radeon/evergreen.c b/drivers/gpu/drm/radeon/evergreen.c
    index d65a96562498..5428b692f9a2 100644
    --- a/drivers/gpu/drm/radeon/evergreen.c
    +++ b/drivers/gpu/drm/radeon/evergreen.c
    @@ -4589,6 +4589,9 @@ int evergreen_irq_set(struct radeon_device *rdev)
    WREG32(AFMT_AUDIO_PACKET_CONTROL + EVERGREEN_CRTC4_REGISTER_OFFSET, afmt5);
    WREG32(AFMT_AUDIO_PACKET_CONTROL + EVERGREEN_CRTC5_REGISTER_OFFSET, afmt6);

    + /* posting read */
    + RREG32(SRBM_STATUS);
    +
    return 0;
    }


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