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

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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>
This commit is contained in:
Anatolij Gustschin 2013-04-01 17:31:19 +02:00 committed by Mark Brown
parent 86e98743ec
commit c3e2aa8610
1 changed files with 3 additions and 7 deletions
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10
drivers/spi/spi-mpc512x-psc.c
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@ -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);