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spi: fsl-espi: improve message length handling

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Move checking for a zero-length message up in the call chain and
use m->frame_length instead of re-calculating the overall length
of all transfers in the message.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Heiner Kallweit 2016-09-07 22:54:35 +02:00 committed by Mark Brown
parent cce7e3a2fe
commit 06af115d6c
1 changed files with 5 additions and 7 deletions
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12
drivers/spi/spi-fsl-espi.c
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@ -283,8 +283,7 @@ static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
fsl_espi_setup_transfer(spi, trans);
if (trans->len)
ret = fsl_espi_bufs(spi, trans);
ret = fsl_espi_bufs(spi, trans);
if (trans->delay_usecs)
udelay(trans->delay_usecs);
@ -313,7 +312,7 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
struct spi_message *m)
{
struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
unsigned int delay_usecs = 0, xfer_len = 0;
unsigned int delay_usecs = 0;
struct spi_transfer *t, trans = {};
int ret;
@ -322,8 +321,6 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
goto out;
list_for_each_entry(t, &m->transfers, transfer_list) {
if ((t->tx_buf) || (t->rx_buf))
xfer_len += t->len;
if (t->delay_usecs > delay_usecs)
delay_usecs = t->delay_usecs;
}
@ -331,14 +328,15 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
t = list_first_entry(&m->transfers, struct spi_transfer,
transfer_list);
trans.len = xfer_len;
trans.len = m->frame_length;
trans.speed_hz = t->speed_hz;
trans.bits_per_word = t->bits_per_word;
trans.delay_usecs = delay_usecs;
trans.tx_buf = mspi->local_buf;
trans.rx_buf = mspi->local_buf;
ret = fsl_espi_trans(m, &trans);
if (trans.len)
ret = fsl_espi_trans(m, &trans);
m->actual_length = ret ? 0 : trans.len;
out: