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    Subject[PATCH v3 05/13] scsi: ufs: add quirk not to allow reset of interrupt aggregation
    Date
    From: Seungwon Jeon <essuuj@gmail.com>

    Some host controller supports interrupt aggregation, but doesn't
    allow to reset counter and timer by s/w.

    Signed-off-by: Seungwon Jeon <essuuj@gmail.com>
    Signed-off-by: Alim Akhtar <alim.akhtar@samsung.com>
    ---
    drivers/scsi/ufs/ufshcd.c | 3 ++-
    drivers/scsi/ufs/ufshcd.h | 6 ++++++
    2 files changed, 8 insertions(+), 1 deletion(-)

    diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
    index d41d57d..e388edc 100644
    --- a/drivers/scsi/ufs/ufshcd.c
    +++ b/drivers/scsi/ufs/ufshcd.c
    @@ -3205,7 +3205,8 @@ static void ufshcd_transfer_req_compl(struct ufs_hba *hba)
    * false interrupt if device completes another request after resetting
    * aggregation and before reading the DB.
    */
    - if (ufshcd_is_intr_aggr_allowed(hba))
    + if (ufshcd_is_intr_aggr_allowed(hba) &&
    + !(hba->quirks & UFSHCI_QUIRK_SKIP_RESET_INTR_AGGR))
    ufshcd_reset_intr_aggr(hba);

    tr_doorbell = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL);
    diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
    index 3702b92..0b185e1 100644
    --- a/drivers/scsi/ufs/ufshcd.h
    +++ b/drivers/scsi/ufs/ufshcd.h
    @@ -471,6 +471,12 @@ struct ufs_hba {
    */
    #define UFSHCI_QUIRK_BROKEN_REQ_LIST_CLR UFS_BIT(7)

    + /*
    + * This quirk needs to be enabled if host controller doesn't allow
    + * that the interrupt aggregation timer and counter are reset by s/w.
    + */
    + #define UFSHCI_QUIRK_SKIP_RESET_INTR_AGGR UFS_BIT(8)
    +
    unsigned int quirks; /* Deviations from standard UFSHCI spec. */

    wait_queue_head_t tm_wq;
    --
    1.7.10.4


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