[Resend PATCH 3/3] scsi:stex.c Add S3/S4 support

[Charles Chiou]

From f442518879f8f41d103b684046d912eca13844e7 Mon Sep 17 00:00:00 2001
From: Charles <charles.chiou@xxxxxxxxxxxxxx>
Date: Wed, 2 Sep 2015 20:54:45 +0800
Subject: [PATCH 3/3] scsi:stex.c Add S3/S4 support

Add S3/S4 support, add .suspend and .resume function in pci_driver.
In .suspend handler, driver send S3/S4 signal to the device.

V2: Remove blank lines

Signed-off-by: Charles Chiou <charles.chiou@xxxxxxxxxxxxxx>
Reviewed-by: Johannes Thumshirn <jthumshirn@xxxxxxx>

---
  drivers/scsi/stex.c | 59 
++++++++++++++++++++++++++++++++++++++++++++++++++---
  1 file changed, 56 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/stex.c b/drivers/scsi/stex.c
index 4ef0c80..c96a86d 100644
--- a/drivers/scsi/stex.c
+++ b/drivers/scsi/stex.c
@@ -166,6 +166,13 @@ enum {

      ST_ADDITIONAL_MEM            = 0x200000,
      ST_ADDITIONAL_MEM_MIN            = 0x80000,
+    PMIC_SHUTDOWN                = 0x0D,
+    PMIC_REUMSE                    = 0x10,
+    ST_IGNORED                    = -1,
+    ST_S3                        = 3,
+    ST_S4                        = 4,
+    ST_S5                        = 5,
+    ST_S6                        = 6,
  };

  struct st_sgitem {
@@ -1733,7 +1740,7 @@ out_disable:
      return err;
  }

-static void stex_hba_stop(struct st_hba *hba)
+static void stex_hba_stop(struct st_hba *hba, int st_sleep_mic)
  {
      struct req_msg *req;
      struct st_msg_header *msg_h;
@@ -1749,11 +1756,18 @@ static void stex_hba_stop(struct st_hba *hba)
      } else
          memset(req, 0, hba->rq_size);

-    if (hba->cardtype == st_yosemite || hba->cardtype == st_yel) {
+    if ((hba->cardtype == st_yosemite || hba->cardtype == st_yel)
+        && st_sleep_mic == ST_IGNORED) {
          req->cdb[0] = MGT_CMD;
          req->cdb[1] = MGT_CMD_SIGNATURE;
          req->cdb[2] = CTLR_CONFIG_CMD;
          req->cdb[3] = CTLR_SHUTDOWN;
+    } else if (hba->cardtype == st_yel && st_sleep_mic != ST_IGNORED) {
+        req->cdb[0] = MGT_CMD;
+        req->cdb[1] = MGT_CMD_SIGNATURE;
+        req->cdb[2] = CTLR_CONFIG_CMD;
+        req->cdb[3] = PMIC_SHUTDOWN;
+        req->cdb[4] = st_sleep_mic;
      } else {
          req->cdb[0] = CONTROLLER_CMD;
          req->cdb[1] = CTLR_POWER_STATE_CHANGE;
@@ -1773,10 +1787,12 @@ static void stex_hba_stop(struct st_hba *hba)
      while (hba->ccb[tag].req_type & PASSTHRU_REQ_TYPE) {
          if (time_after(jiffies, before + ST_INTERNAL_TIMEOUT * HZ)) {
              hba->ccb[tag].req_type = 0;
+            hba->mu_status = MU_STATE_STOP;
              return;
          }
          msleep(1);
      }
+    hba->mu_status = MU_STATE_STOP;
  }

  static void stex_hba_free(struct st_hba *hba)
@@ -1816,9 +1832,44 @@ static void stex_shutdown(struct pci_dev *pdev)
  {
      struct st_hba *hba = pci_get_drvdata(pdev);

-    stex_hba_stop(hba);
+    if (hba->supports_pm == 0)
+        stex_hba_stop(hba, ST_IGNORED);
+    else
+        stex_hba_stop(hba, ST_S5);
+}
+
+static int stex_choice_sleep_mic(pm_message_t state)
+{
+    switch (state.event) {
+    case PM_EVENT_SUSPEND:
+        return ST_S3;
+    case PM_EVENT_FREEZE:
+    case PM_EVENT_HIBERNATE:
+        return ST_S4;
+    default:
+        return ST_S4;
+    }
+}
+
+static int stex_suspend(struct pci_dev *pdev, pm_message_t state)
+{
+    struct st_hba *hba = pci_get_drvdata(pdev);
+
+    if (hba->cardtype == st_yel && hba->supports_pm == 1)
+        stex_hba_stop(hba, stex_choice_sleep_mic(state));
+    else
+        stex_hba_stop(hba, ST_IGNORED);
+    return 0;
  }

+static int stex_resume(struct pci_dev *pdev)
+{
+    struct st_hba *hba = pci_get_drvdata(pdev);
+
+    hba->mu_status = MU_STATE_STARTING;
+    stex_handshake(hba);
+    return 0;
+}
  MODULE_DEVICE_TABLE(pci, stex_pci_tbl);

  static struct pci_driver stex_pci_driver = {
@@ -1827,6 +1878,8 @@ static struct pci_driver stex_pci_driver = {
      .probe        = stex_probe,
      .remove        = stex_remove,
      .shutdown    = stex_shutdown,
+    .suspend    = stex_suspend,
+    .resume        = stex_resume,
  };

  static int __init stex_init(void)