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    Subject[PATCH 4/7] scsi: hisi_sas: modify hard reset for directed-attached disk
    Date
    From: Xiang Chen <chenxiang66@hisilicon.com>

    Correctly set registers in v2 for root PHY hardreset for directly
    attached disk.

    Signed-off-by: Xiang Chen <chenxiang66@hisilicon.com>
    Signed-off-by: John Garry <john.garry@huawei.com>
    ---
    drivers/scsi/hisi_sas/hisi_sas_v2_hw.c | 10 ++++++++++
    1 file changed, 10 insertions(+)

    diff --git a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
    index 452e329..7519772 100644
    --- a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
    +++ b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
    @@ -207,6 +207,8 @@
    #define TXID_AUTO (PORT_BASE + 0xb8)
    #define TXID_AUTO_CT3_OFF 1
    #define TXID_AUTO_CT3_MSK (0x1 << TXID_AUTO_CT3_OFF)
    +#define TX_HARDRST_OFF 2
    +#define TX_HARDRST_MSK (0x1 << TX_HARDRST_OFF)
    #define RX_IDAF_DWORD0 (PORT_BASE + 0xc4)
    #define RX_IDAF_DWORD1 (PORT_BASE + 0xc8)
    #define RX_IDAF_DWORD2 (PORT_BASE + 0xcc)
    @@ -1075,7 +1077,15 @@ static void stop_phy_v2_hw(struct hisi_hba *hisi_hba, int phy_no)

    static void phy_hard_reset_v2_hw(struct hisi_hba *hisi_hba, int phy_no)
    {
    + struct hisi_sas_phy *phy = &hisi_hba->phy[phy_no];
    + u32 txid_auto;
    +
    stop_phy_v2_hw(hisi_hba, phy_no);
    + if (phy->identify.device_type == SAS_END_DEVICE) {
    + txid_auto = hisi_sas_phy_read32(hisi_hba, phy_no, TXID_AUTO);
    + hisi_sas_phy_write32(hisi_hba, phy_no, TXID_AUTO,
    + txid_auto | TX_HARDRST_MSK);
    + }
    msleep(100);
    start_phy_v2_hw(hisi_hba, phy_no);
    }
    --
    1.9.1
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