spi: spi-mpc512x-psc: let transmiter/receiver enabled when in xfer loop

There is no need to disable transmitter/receiver after each loop
iteration and re-enable it for next loop iteration. Enable the
transmitter/receiver before xfer loop starts and disable it when
the whole transfer is done.

Signed-off-by: Anatolij Gustschin <agust@denx.de>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 3 insertions, 7 deletions

diff --git a/drivers/spi/spi-mpc512x-psc.c b/drivers/spi/spi-mpc512x-psc.c
index da60f268f74c..dfddf336912d 100644
--- a/drivers/spi/spi-mpc512x-psc.c
+++ b/drivers/spi/spi-mpc512x-psc.c
@@ -149,6 +149,9 @@ static int mpc512x_psc_spi_transfer_rxtx(struct spi_device *spi,
         in_8(&psc->mode);
         out_8(&psc->mode, 0x0);
 
+        /* enable transmiter/receiver */
+        out_8(&psc->command, MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE);
+
         while (len) {
                 int count;
                 int i;
@@ -177,10 +180,6 @@ static int mpc512x_psc_spi_transfer_rxtx(struct spi_device *spi,
                 out_be32(&fifo->txisr, MPC512x_PSC_FIFO_EMPTY);
                 out_be32(&fifo->tximr, MPC512x_PSC_FIFO_EMPTY);
 
-                /* enable transmiter/receiver */
-                out_8(&psc->command,
-                      MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE);
-
                 wait_for_completion(&mps->done);
 
                 mdelay(1);
@@ -205,9 +204,6 @@ static int mpc512x_psc_spi_transfer_rxtx(struct spi_device *spi,
                 while (in_be32(&fifo->rxcnt)) {
                         in_8(&fifo->rxdata_8);
                 }
-
-                out_8(&psc->command,
-                      MPC52xx_PSC_TX_DISABLE | MPC52xx_PSC_RX_DISABLE);
         }
         /* disable transmiter/receiver and fifo interrupt */
         out_8(&psc->command, MPC52xx_PSC_TX_DISABLE | MPC52xx_PSC_RX_DISABLE);