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Subject[PATCH v2] scsi: ufs: Update L4 attributes on manual hibern8 exit in Cadence UFS.
Date
Backup L4 attributes duirng manual hibern8 entry
and restore the L4 attributes on manual hibern8 exit as per JESD220C.

Signed-off-by: Sheeba B <sheebab@cadence.com>

Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com>
---
v2:
Dropped patch 1/2 for this series and rebased to include only manual hibernation fixes
---
drivers/scsi/ufs/cdns-pltfrm.c | 106 +++++++++++++++++++++++++++++++++
1 file changed, 106 insertions(+)

diff --git a/drivers/scsi/ufs/cdns-pltfrm.c b/drivers/scsi/ufs/cdns-pltfrm.c
index 6feeb0faf123..1c80f9633da6 100644
--- a/drivers/scsi/ufs/cdns-pltfrm.c
+++ b/drivers/scsi/ufs/cdns-pltfrm.c
@@ -19,6 +19,85 @@

#define CDNS_UFS_REG_HCLKDIV 0xFC
#define CDNS_UFS_REG_PHY_XCFGD1 0x113C
+#define CDNS_UFS_MAX_L4_ATTRS 12
+
+struct cdns_ufs_host {
+ /**
+ * cdns_ufs_dme_attr_val - for storing L4 attributes
+ */
+ u32 cdns_ufs_dme_attr_val[CDNS_UFS_MAX_L4_ATTRS];
+};
+
+/**
+ * cdns_ufs_get_l4_attr - get L4 attributes on local side
+ * @hba: per adapter instance
+ *
+ */
+static void cdns_ufs_get_l4_attr(struct ufs_hba *hba)
+{
+ struct cdns_ufs_host *host = ufshcd_get_variant(hba);
+
+ ufshcd_dme_get(hba, UIC_ARG_MIB(T_PEERDEVICEID),
+ &host->cdns_ufs_dme_attr_val[0]);
+ ufshcd_dme_get(hba, UIC_ARG_MIB(T_PEERCPORTID),
+ &host->cdns_ufs_dme_attr_val[1]);
+ ufshcd_dme_get(hba, UIC_ARG_MIB(T_TRAFFICCLASS),
+ &host->cdns_ufs_dme_attr_val[2]);
+ ufshcd_dme_get(hba, UIC_ARG_MIB(T_PROTOCOLID),
+ &host->cdns_ufs_dme_attr_val[3]);
+ ufshcd_dme_get(hba, UIC_ARG_MIB(T_CPORTFLAGS),
+ &host->cdns_ufs_dme_attr_val[4]);
+ ufshcd_dme_get(hba, UIC_ARG_MIB(T_TXTOKENVALUE),
+ &host->cdns_ufs_dme_attr_val[5]);
+ ufshcd_dme_get(hba, UIC_ARG_MIB(T_RXTOKENVALUE),
+ &host->cdns_ufs_dme_attr_val[6]);
+ ufshcd_dme_get(hba, UIC_ARG_MIB(T_LOCALBUFFERSPACE),
+ &host->cdns_ufs_dme_attr_val[7]);
+ ufshcd_dme_get(hba, UIC_ARG_MIB(T_PEERBUFFERSPACE),
+ &host->cdns_ufs_dme_attr_val[8]);
+ ufshcd_dme_get(hba, UIC_ARG_MIB(T_CREDITSTOSEND),
+ &host->cdns_ufs_dme_attr_val[9]);
+ ufshcd_dme_get(hba, UIC_ARG_MIB(T_CPORTMODE),
+ &host->cdns_ufs_dme_attr_val[10]);
+ ufshcd_dme_get(hba, UIC_ARG_MIB(T_CONNECTIONSTATE),
+ &host->cdns_ufs_dme_attr_val[11]);
+}
+
+/**
+ * cdns_ufs_set_l4_attr - set L4 attributes on local side
+ * @hba: per adapter instance
+ *
+ */
+static void cdns_ufs_set_l4_attr(struct ufs_hba *hba)
+{
+ struct cdns_ufs_host *host = ufshcd_get_variant(hba);
+
+ ufshcd_dme_set(hba, UIC_ARG_MIB(T_CONNECTIONSTATE), 0);
+ ufshcd_dme_set(hba, UIC_ARG_MIB(T_PEERDEVICEID),
+ host->cdns_ufs_dme_attr_val[0]);
+ ufshcd_dme_set(hba, UIC_ARG_MIB(T_PEERCPORTID),
+ host->cdns_ufs_dme_attr_val[1]);
+ ufshcd_dme_set(hba, UIC_ARG_MIB(T_TRAFFICCLASS),
+ host->cdns_ufs_dme_attr_val[2]);
+ ufshcd_dme_set(hba, UIC_ARG_MIB(T_PROTOCOLID),
+ host->cdns_ufs_dme_attr_val[3]);
+ ufshcd_dme_set(hba, UIC_ARG_MIB(T_CPORTFLAGS),
+ host->cdns_ufs_dme_attr_val[4]);
+ ufshcd_dme_set(hba, UIC_ARG_MIB(T_TXTOKENVALUE),
+ host->cdns_ufs_dme_attr_val[5]);
+ ufshcd_dme_set(hba, UIC_ARG_MIB(T_RXTOKENVALUE),
+ host->cdns_ufs_dme_attr_val[6]);
+ ufshcd_dme_set(hba, UIC_ARG_MIB(T_LOCALBUFFERSPACE),
+ host->cdns_ufs_dme_attr_val[7]);
+ ufshcd_dme_set(hba, UIC_ARG_MIB(T_PEERBUFFERSPACE),
+ host->cdns_ufs_dme_attr_val[8]);
+ ufshcd_dme_set(hba, UIC_ARG_MIB(T_CREDITSTOSEND),
+ host->cdns_ufs_dme_attr_val[9]);
+ ufshcd_dme_set(hba, UIC_ARG_MIB(T_CPORTMODE),
+ host->cdns_ufs_dme_attr_val[10]);
+ ufshcd_dme_set(hba, UIC_ARG_MIB(T_CONNECTIONSTATE),
+ host->cdns_ufs_dme_attr_val[11]);
+}

/**
* Sets HCLKDIV register value based on the core_clk
@@ -77,6 +156,22 @@ static int cdns_ufs_hce_enable_notify(struct ufs_hba *hba,
return cdns_ufs_set_hclkdiv(hba);
}

+/**
+ * Called around hibern8 enter/exit.
+ * @hba: host controller instance
+ * @cmd: UIC Command
+ * @status: notify stage (pre, post change)
+ *
+ */
+static void cdns_ufs_hibern8_notify(struct ufs_hba *hba, enum uic_cmd_dme cmd,
+ enum ufs_notify_change_status status)
+{
+ if (status == PRE_CHANGE && cmd == UIC_CMD_DME_HIBER_ENTER)
+ cdns_ufs_get_l4_attr(hba);
+ if (status == POST_CHANGE && cmd == UIC_CMD_DME_HIBER_EXIT)
+ cdns_ufs_set_l4_attr(hba);
+}
+
/**
* Called before and after Link startup is carried out.
* @hba: host controller instance
@@ -117,6 +212,14 @@ static int cdns_ufs_link_startup_notify(struct ufs_hba *hba,
static int cdns_ufs_init(struct ufs_hba *hba)
{
int status = 0;
+ struct cdns_ufs_host *host;
+ struct device *dev = hba->dev;
+
+ host = devm_kzalloc(dev, sizeof(*host), GFP_KERNEL);
+
+ if (!host)
+ return -ENOMEM;
+ ufshcd_set_variant(hba, host);

if (hba->vops && hba->vops->phy_initialization)
status = hba->vops->phy_initialization(hba);
@@ -144,8 +247,10 @@ static int cdns_ufs_m31_16nm_phy_initialization(struct ufs_hba *hba)

static const struct ufs_hba_variant_ops cdns_ufs_pltfm_hba_vops = {
.name = "cdns-ufs-pltfm",
+ .init = cdns_ufs_init,
.hce_enable_notify = cdns_ufs_hce_enable_notify,
.link_startup_notify = cdns_ufs_link_startup_notify,
+ .hibern8_notify = cdns_ufs_hibern8_notify,
};

static const struct ufs_hba_variant_ops cdns_ufs_m31_16nm_pltfm_hba_vops = {
@@ -154,6 +259,7 @@ static const struct ufs_hba_variant_ops cdns_ufs_m31_16nm_pltfm_hba_vops = {
.hce_enable_notify = cdns_ufs_hce_enable_notify,
.link_startup_notify = cdns_ufs_link_startup_notify,
.phy_initialization = cdns_ufs_m31_16nm_phy_initialization,
+ .hibern8_notify = cdns_ufs_hibern8_notify,
};

static const struct of_device_id cdns_ufs_of_match[] = {
--
2.17.1
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