i2c: rcar: let DMA enable routine return success status

We will need to know if enabling DMA was successful in a later patch.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

1 files changed, 6 insertions, 5 deletions

diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c
index 57083e91f2cf..b0d85f5957d4 100644
--- a/drivers/i2c/busses/i2c-rcar.c
+++ b/drivers/i2c/busses/i2c-rcar.c
@@ -399,7 +399,7 @@ static void rcar_i2c_dma_callback(void *data)
         rcar_i2c_dma_unmap(priv);
 }
 
-static void rcar_i2c_dma(struct rcar_i2c_priv *priv)
+static bool rcar_i2c_dma(struct rcar_i2c_priv *priv)
 {
         struct device *dev = rcar_i2c_priv_to_dev(priv);
         struct i2c_msg *msg = priv->msg;
@@ -415,7 +415,7 @@ static void rcar_i2c_dma(struct rcar_i2c_priv *priv)
         /* Do various checks to see if DMA is feasible at all */
         if (IS_ERR(chan) || msg->len < RCAR_MIN_DMA_LEN ||
             !(msg->flags & I2C_M_DMA_SAFE) || (read && priv->flags & ID_P_NO_RXDMA))
-                return;
+                return false;
 
         if (read) {
                 /*
@@ -435,7 +435,7 @@ static void rcar_i2c_dma(struct rcar_i2c_priv *priv)
         dma_addr = dma_map_single(chan->device->dev, buf, len, dir);
         if (dma_mapping_error(chan->device->dev, dma_addr)) {
                 dev_dbg(dev, "dma map failed, using PIO\n");
-                return;
+                return false;
         }
 
         sg_dma_len(&priv->sg) = len;
@@ -449,7 +449,7 @@ static void rcar_i2c_dma(struct rcar_i2c_priv *priv)
         if (!txdesc) {
                 dev_dbg(dev, "dma prep slave sg failed, using PIO\n");
                 rcar_i2c_cleanup_dma(priv);
-                return;
+                return false;
         }
 
         txdesc->callback = rcar_i2c_dma_callback;
@@ -459,7 +459,7 @@ static void rcar_i2c_dma(struct rcar_i2c_priv *priv)
         if (dma_submit_error(cookie)) {
                 dev_dbg(dev, "submitting dma failed, using PIO\n");
                 rcar_i2c_cleanup_dma(priv);
-                return;
+                return false;
         }
 
         /* Enable DMA Master Received/Transmitted */
@@ -469,6 +469,7 @@ static void rcar_i2c_dma(struct rcar_i2c_priv *priv)
                 rcar_i2c_write(priv, ICDMAER, TMDMAE);
 
         dma_async_issue_pending(chan);
+        return true;
 }
 
 static void rcar_i2c_irq_send(struct rcar_i2c_priv *priv, u32 msr)