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    Subject[PATCH 5.16 0655/1017] dmaengine: idxd: restore traffic class defaults after wq reset
    Date
    From: Dave Jiang <dave.jiang@intel.com>

    [ Upstream commit ea7c8f598c323f6ebaf9ddae01fb2a981fe8c56a ]

    When clearing the group configurations, the driver fails to restore the
    default setting for DSA 1.x based devices. Add defaults in
    idxd_groups_clear_state() for traffic class configuration.

    Fixes: ade8a86b512c ("dmaengine: idxd: Set defaults for GRPCFG traffic class")
    Reported-by: Binuraj Ravindran <binuraj.ravindran@intel.com>
    Signed-off-by: Dave Jiang <dave.jiang@intel.com>
    Link: https://lore.kernel.org/r/164304123369.824298.6952463420266592087.stgit@djiang5-desk3.ch.intel.com
    Signed-off-by: Vinod Koul <vkoul@kernel.org>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/dma/idxd/device.c | 9 +++++++--
    1 file changed, 7 insertions(+), 2 deletions(-)

    diff --git a/drivers/dma/idxd/device.c b/drivers/dma/idxd/device.c
    index 83aa0c79f830..4bafc88f425f 100644
    --- a/drivers/dma/idxd/device.c
    +++ b/drivers/dma/idxd/device.c
    @@ -691,8 +691,13 @@ static void idxd_groups_clear_state(struct idxd_device *idxd)
    group->use_rdbuf_limit = false;
    group->rdbufs_allowed = 0;
    group->rdbufs_reserved = 0;
    - group->tc_a = -1;
    - group->tc_b = -1;
    + if (idxd->hw.version < DEVICE_VERSION_2 && !tc_override) {
    + group->tc_a = 1;
    + group->tc_b = 1;
    + } else {
    + group->tc_a = -1;
    + group->tc_b = -1;
    + }
    }
    }

    --
    2.34.1


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