[SCSI] ufs: fix the setting interrupt aggregation counter

IACTH(Interrupt aggregation counter threshold) value is allowed
up to 0x1F and current setting value is the maximum.
This value is related with NUTRS(max:0x20) of HCI's capability.
Considering HCI controller doesn't support the maximum, IACTH
setting should be adjusted with possible value.
For that, existing 'ufshcd_config_int_aggr' is split into two part
[reset, configure].

Signed-off-by: Seungwon Jeon <tgih.jun@samsung.com>
Reviewed-by: Subhash Jadavani <subhashj@codeaurora.org>
Tested-by: Yaniv Gardi <ygardi@codeaurora.org>
Signed-off-by: Santosh Y <santoshsy@gmail.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

2 files changed, 27 insertions, 30 deletions

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 6c34f6ae8870..46b0754b4b76 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -56,6 +56,9 @@
 /* Expose the flag value from utp_upiu_query.value */
 #define MASK_QUERY_UPIU_FLAG_LOC 0xFF
 
+/* Interrupt aggregation default timeout, unit: 40us */
+#define INT_AGGR_DEF_TO 0x02
+
 enum {
         UFSHCD_MAX_CHANNEL      = 0,
         UFSHCD_MAX_ID           = 1,
@@ -78,12 +81,6 @@ enum {
         UFSHCD_INT_CLEAR,
 };
 
-/* Interrupt aggregation options */
-enum {
-        INT_AGGR_RESET,
-        INT_AGGR_CONFIG,
-};
-
 /*
  * ufshcd_wait_for_register - wait for register value to change
  * @hba - per-adapter interface
@@ -290,30 +287,30 @@ static inline bool ufshcd_is_exception_event(struct utp_upiu_rsp *ucd_rsp_ptr)
 }
 
 /**
- * ufshcd_config_int_aggr - Configure interrupt aggregation values.
- *              Currently there is no use case where we want to configure
- *              interrupt aggregation dynamically. So to configure interrupt
- *              aggregation, #define INT_AGGR_COUNTER_THRESHOLD_VALUE and
- *              INT_AGGR_TIMEOUT_VALUE are used.
+ * ufshcd_reset_intr_aggr - Reset interrupt aggregation values.
  * @hba: per adapter instance
- * @option: Interrupt aggregation option
  */
 static inline void
-ufshcd_config_int_aggr(struct ufs_hba *hba, int option)
+ufshcd_reset_intr_aggr(struct ufs_hba *hba)
 {
-        switch (option) {
-        case INT_AGGR_RESET:
-                ufshcd_writel(hba, INT_AGGR_ENABLE |
-                              INT_AGGR_COUNTER_AND_TIMER_RESET,
-                              REG_UTP_TRANSFER_REQ_INT_AGG_CONTROL);
-                break;
-        case INT_AGGR_CONFIG:
-                ufshcd_writel(hba, INT_AGGR_ENABLE | INT_AGGR_PARAM_WRITE |
-                              INT_AGGR_COUNTER_THRESHOLD_VALUE |
-                              INT_AGGR_TIMEOUT_VALUE,
-                              REG_UTP_TRANSFER_REQ_INT_AGG_CONTROL);
-                break;
-        }
+        ufshcd_writel(hba, INT_AGGR_ENABLE |
+                      INT_AGGR_COUNTER_AND_TIMER_RESET,
+                      REG_UTP_TRANSFER_REQ_INT_AGG_CONTROL);
+}
+
+/**
+ * ufshcd_config_intr_aggr - Configure interrupt aggregation values.
+ * @hba: per adapter instance
+ * @cnt: Interrupt aggregation counter threshold
+ * @tmout: Interrupt aggregation timeout value
+ */
+static inline void
+ufshcd_config_intr_aggr(struct ufs_hba *hba, u8 cnt, u8 tmout)
+{
+        ufshcd_writel(hba, INT_AGGR_ENABLE | INT_AGGR_PARAM_WRITE |
+                      INT_AGGR_COUNTER_THLD_VAL(cnt) |
+                      INT_AGGR_TIMEOUT_VAL(tmout),
+                      REG_UTP_TRANSFER_REQ_INT_AGG_CONTROL);
 }
 
 /**
@@ -1457,7 +1454,7 @@ static int ufshcd_make_hba_operational(struct ufs_hba *hba)
         ufshcd_enable_intr(hba, UFSHCD_ENABLE_INTRS);
 
         /* Configure interrupt aggregation */
-        ufshcd_config_int_aggr(hba, INT_AGGR_CONFIG);
+        ufshcd_config_intr_aggr(hba, hba->nutrs - 1, INT_AGGR_DEF_TO);
 
         /* Configure UTRL and UTMRL base address registers */
         ufshcd_writel(hba, lower_32_bits(hba->utrdl_dma_addr),
@@ -1967,7 +1964,7 @@ static void ufshcd_transfer_req_compl(struct ufs_hba *hba)
 
         /* Reset interrupt aggregation counters */
         if (int_aggr_reset)
-                ufshcd_config_int_aggr(hba, INT_AGGR_RESET);
+                ufshcd_reset_intr_aggr(hba);
 }
 
 /**
diff --git a/drivers/scsi/ufs/ufshci.h b/drivers/scsi/ufs/ufshci.h
index f1e1b7459107..739ae3aade0e 100644
--- a/drivers/scsi/ufs/ufshci.h
+++ b/drivers/scsi/ufs/ufshci.h
@@ -226,8 +226,8 @@ enum {
 
 #define MASK_UIC_COMMAND_RESULT                 0xFF
 
-#define INT_AGGR_COUNTER_THRESHOLD_VALUE        (0x1F << 8)
-#define INT_AGGR_TIMEOUT_VALUE                  (0x02)
+#define INT_AGGR_COUNTER_THLD_VAL(c)    (((c) & 0x1F) << 8)
+#define INT_AGGR_TIMEOUT_VAL(t)         (((t) & 0xFF) << 0)
 
 /* Interrupt disable masks */
 enum {