scsi: ufs: provide a quirk to disable the LCC

LCC (Line Control Command) are being used for communication between
UFS host and UFS device.
New commercial UFS devices don't have the issues with LCC processing
but UFS host controller might still have the issue with LCC processing,
hence, added a routine to disable TX LCC on the device.

Signed-off-by: Yaniv Gardi <ygardi@codeaurora.org>
Reviewed-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: James Bottomley <JBottomley@Odin.com>

3 files changed, 53 insertions, 0 deletions

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 9641bcb90cd2..3e57cca1ef33 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -2640,6 +2640,42 @@ static int ufshcd_hba_enable(struct ufs_hba *hba)
         return 0;
 }
 
+static int ufshcd_disable_tx_lcc(struct ufs_hba *hba, bool peer)
+{
+        int tx_lanes, i, err = 0;
+
+        if (!peer)
+                ufshcd_dme_get(hba, UIC_ARG_MIB(PA_CONNECTEDTXDATALANES),
+                               &tx_lanes);
+        else
+                ufshcd_dme_peer_get(hba, UIC_ARG_MIB(PA_CONNECTEDTXDATALANES),
+                                    &tx_lanes);
+        for (i = 0; i < tx_lanes; i++) {
+                if (!peer)
+                        err = ufshcd_dme_set(hba,
+                                UIC_ARG_MIB_SEL(TX_LCC_ENABLE,
+                                        UIC_ARG_MPHY_TX_GEN_SEL_INDEX(i)),
+                                        0);
+                else
+                        err = ufshcd_dme_peer_set(hba,
+                                UIC_ARG_MIB_SEL(TX_LCC_ENABLE,
+                                        UIC_ARG_MPHY_TX_GEN_SEL_INDEX(i)),
+                                        0);
+                if (err) {
+                        dev_err(hba->dev, "%s: TX LCC Disable failed, peer = %d, lane = %d, err = %d",
+                                __func__, peer, i, err);
+                        break;
+                }
+        }
+
+        return err;
+}
+
+static inline int ufshcd_disable_device_tx_lcc(struct ufs_hba *hba)
+{
+        return ufshcd_disable_tx_lcc(hba, true);
+}
+
 /**
  * ufshcd_link_startup - Initialize unipro link startup
  * @hba: per adapter instance
@@ -2677,6 +2713,12 @@ static int ufshcd_link_startup(struct ufs_hba *hba)
                 /* failed to get the link up... retire */
                 goto out;
 
+        if (hba->quirks & UFSHCD_QUIRK_BROKEN_LCC) {
+                ret = ufshcd_disable_device_tx_lcc(hba);
+                if (ret)
+                        goto out;
+        }
+
         /* Include any host controller configuration via UIC commands */
         if (hba->vops && hba->vops->link_startup_notify) {
                 ret = hba->vops->link_startup_notify(hba, POST_CHANGE);
diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index fc8bec9960b1..b845f1535f29 100644
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -426,6 +426,14 @@ struct ufs_hba {
          */
         #define UFSHCD_QUIRK_DELAY_BEFORE_DME_CMDS              UFS_BIT(1)
 
+        /*
+         * If UFS host controller is having issue in processing LCC (Line
+         * Control Command) coming from device then enable this quirk.
+         * When this quirk is enabled, host controller driver should disable
+         * the LCC transmission on UFS device (by clearing TX_LCC_ENABLE
+         * attribute of device to 0).
+         */
+        #define UFSHCD_QUIRK_BROKEN_LCC                         UFS_BIT(2)
 
         unsigned int quirks;    /* Deviations from standard UFSHCI spec. */
 
diff --git a/drivers/scsi/ufs/ufshci.h b/drivers/scsi/ufs/ufshci.h
index d5721199e9cc..f8909ece2171 100644
--- a/drivers/scsi/ufs/ufshci.h
+++ b/drivers/scsi/ufs/ufshci.h
@@ -206,6 +206,9 @@ enum {
 #define CONFIG_RESULT_CODE_MASK         0xFF
 #define GENERIC_ERROR_CODE_MASK         0xFF
 
+/* GenSelectorIndex calculation macros for M-PHY attributes */
+#define UIC_ARG_MPHY_TX_GEN_SEL_INDEX(lane) (lane)
+
 #define UIC_ARG_MIB_SEL(attr, sel)      ((((attr) & 0xFFFF) << 16) |\
                                          ((sel) & 0xFFFF))
 #define UIC_ARG_MIB(attr)               UIC_ARG_MIB_SEL(attr, 0)