i2c: tegra: Rename I2C_PIO_MODE_MAX_LEN to I2C_PIO_MODE_PREFERRED_LEN

DMA is preferred for a larger transfers, while PIO is preferred for a
smaller transfers to avoid unnecessary DMA overhead. There is no strict
size limitations for the PIO-mode transfers, so let's rename the constant
for clarity.

Tested-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index 0245fc2..e0eb8f5 100644 (file)
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -131,11 +131,12 @@
 #define I2C_PACKET_HEADER_SIZE                 12
 
 /*
- * Upto I2C_PIO_MODE_MAX_LEN bytes, controller will use PIO mode,
- * above this, controller will use DMA to fill FIFO.
- * MAX PIO len is 20 bytes excluding packet header.
+ * I2C Controller will use PIO mode for transfers up to 32 bytes in order to
+ * avoid DMA overhead, otherwise external APB DMA controller will be used.
+ * Note that the actual MAX PIO length is 20 bytes because 32 bytes include
+ * I2C_PACKET_HEADER_SIZE.
  */
-#define I2C_PIO_MODE_MAX_LEN                   32
+#define I2C_PIO_MODE_PREFERRED_LEN             32
 
 /*
  * msg_end_type: The bus control which need to be send at end of transfer.
@@ -1110,7 +1111,7 @@ static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev,
                xfer_size = msg->len + I2C_PACKET_HEADER_SIZE;
 
        xfer_size = ALIGN(xfer_size, BYTES_PER_FIFO_WORD);
-       i2c_dev->is_curr_dma_xfer = (xfer_size > I2C_PIO_MODE_MAX_LEN) &&
+       i2c_dev->is_curr_dma_xfer = (xfer_size > I2C_PIO_MODE_PREFERRED_LEN) &&
                                    i2c_dev->dma_buf &&
                                    !i2c_dev->is_curr_atomic_xfer;
        tegra_i2c_config_fifo_trig(i2c_dev, xfer_size);