i2c-designware: Tx abort cleanups

* ABRT_MASTER_DIS: Fix a typo.

* i2c_dw_handle_tx_abort: Return an appropriate error number
  depending on abort_source.

* i2c_dw_xfer: Add a missing abort_source initialization.

Signed-off-by: Shinya Kuribayashi <shinya.kuribayashi@necel.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>

1 files changed, 40 insertions, 7 deletions

diff --git a/drivers/i2c/busses/i2c-designware.c b/drivers/i2c/busses/i2c-designware.c
index e6b1e6ece5d7..887aed6601fb 100644
--- a/drivers/i2c/busses/i2c-designware.c
+++ b/drivers/i2c/busses/i2c-designware.c
@@ -123,9 +123,27 @@
 #define ABRT_SBYTE_ACKDET       7
 #define ABRT_SBYTE_NORSTRT      9
 #define ABRT_10B_RD_NORSTRT     10
-#define ARB_MASTER_DIS          11
+#define ABRT_MASTER_DIS         11
 #define ARB_LOST                12
 
+#define DW_IC_TX_ABRT_7B_ADDR_NOACK     (1UL << ABRT_7B_ADDR_NOACK)
+#define DW_IC_TX_ABRT_10ADDR1_NOACK     (1UL << ABRT_10ADDR1_NOACK)
+#define DW_IC_TX_ABRT_10ADDR2_NOACK     (1UL << ABRT_10ADDR2_NOACK)
+#define DW_IC_TX_ABRT_TXDATA_NOACK      (1UL << ABRT_TXDATA_NOACK)
+#define DW_IC_TX_ABRT_GCALL_NOACK       (1UL << ABRT_GCALL_NOACK)
+#define DW_IC_TX_ABRT_GCALL_READ        (1UL << ABRT_GCALL_READ)
+#define DW_IC_TX_ABRT_SBYTE_ACKDET      (1UL << ABRT_SBYTE_ACKDET)
+#define DW_IC_TX_ABRT_SBYTE_NORSTRT     (1UL << ABRT_SBYTE_NORSTRT)
+#define DW_IC_TX_ABRT_10B_RD_NORSTRT    (1UL << ABRT_10B_RD_NORSTRT)
+#define DW_IC_TX_ABRT_MASTER_DIS        (1UL << ABRT_MASTER_DIS)
+#define DW_IC_TX_ARB_LOST               (1UL << ARB_LOST)
+
+#define DW_IC_TX_ABRT_NOACK             (DW_IC_TX_ABRT_7B_ADDR_NOACK | \
+                                         DW_IC_TX_ABRT_10ADDR1_NOACK | \
+                                         DW_IC_TX_ABRT_10ADDR2_NOACK | \
+                                         DW_IC_TX_ABRT_TXDATA_NOACK | \
+                                         DW_IC_TX_ABRT_GCALL_NOACK)
+
 static char *abort_sources[] = {
         [ABRT_7B_ADDR_NOACK]    =
                 "slave address not acknowledged (7bit mode)",
@@ -472,6 +490,24 @@ i2c_dw_read(struct dw_i2c_dev *dev)
         }
 }
 
+static int i2c_dw_handle_tx_abort(struct dw_i2c_dev *dev)
+{
+        unsigned long abort_source = dev->abort_source;
+        int i;
+
+        for_each_bit(i, &abort_source, ARRAY_SIZE(abort_sources))
+                dev_err(dev->dev, "%s: %s\n", __func__, abort_sources[i]);
+
+        if (abort_source & DW_IC_TX_ARB_LOST)
+                return -EAGAIN;
+        else if (abort_source & DW_IC_TX_ABRT_NOACK)
+                return -EREMOTEIO;
+        else if (abort_source & DW_IC_TX_ABRT_GCALL_READ)
+                return -EINVAL; /* wrong msgs[] data */
+        else
+                return -EIO;
+}
+
 /*
  * Prepare controller for a transaction and call i2c_dw_xfer_msg
  */
@@ -493,6 +529,7 @@ i2c_dw_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
         dev->msg_read_idx = 0;
         dev->msg_err = 0;
         dev->status = STATUS_IDLE;
+        dev->abort_source = 0;
 
         ret = i2c_dw_wait_bus_not_busy(dev);
         if (ret < 0)
@@ -526,12 +563,8 @@ i2c_dw_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
 
         /* We have an error */
         if (dev->cmd_err == DW_IC_ERR_TX_ABRT) {
-                unsigned long abort_source = dev->abort_source;
-                int i;
-
-                for_each_bit(i, &abort_source, ARRAY_SIZE(abort_sources)) {
-                    dev_err(dev->dev, "%s: %s\n", __func__, abort_sources[i]);
-                }
+                ret = i2c_dw_handle_tx_abort(dev);
+                goto done;
         }
         ret = -EIO;