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spi: fsl-espi: remove element status from struct fsl_espi_transfer 

Use the return values of the functions in the call chain to transport
status information instead of using an element in struct
fsl_espi_transfer for this.

This is more in line with the general approach how to handle status
information and is one step further to eventually get rid of
struct fsl_espi_transfer completely.

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 22:51:10 +02:00 committed by Mark Brown
parent 7c159aa8c1
commit e33a3ade90
1 changed files with 26 additions and 21 deletions
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47
drivers/spi/spi-fsl-espi.c
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@ -42,7 +42,6 @@ struct fsl_espi_transfer {
void *rx_buf;
unsigned len;
unsigned actual_length;
int status;
};
/* eSPI Controller mode register definitions */
@ -269,14 +268,14 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
return mpc8xxx_spi->count;
}
static void fsl_espi_do_trans(struct spi_message *m,
struct fsl_espi_transfer *tr)
static int fsl_espi_do_trans(struct spi_message *m,
struct fsl_espi_transfer *tr)
{
struct spi_device *spi = m->spi;
struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master);
struct fsl_espi_transfer *espi_trans = tr;
struct spi_transfer *t, *first, trans;
int status = 0;
int ret = 0;
memset(&trans, 0, sizeof(trans));
@ -285,10 +284,9 @@ static void fsl_espi_do_trans(struct spi_message *m,
list_for_each_entry(t, &m->transfers, transfer_list) {
if ((first->bits_per_word != t->bits_per_word) ||
(first->speed_hz != t->speed_hz)) {
espi_trans->status = -EINVAL;
dev_err(mspi->dev,
"bits_per_word/speed_hz should be same for the same SPI transfer\n");
return;
return -EINVAL;
}
trans.speed_hz = t->speed_hz;
@ -303,52 +301,59 @@ static void fsl_espi_do_trans(struct spi_message *m,
fsl_espi_setup_transfer(spi, &trans);
if (trans.len)
status = fsl_espi_bufs(spi, &trans);
ret = fsl_espi_bufs(spi, &trans);
if (status)
status = -EMSGSIZE;
if (ret)
ret = -EMSGSIZE;
if (trans.delay_usecs)
udelay(trans.delay_usecs);
espi_trans->status = status;
fsl_espi_setup_transfer(spi, NULL);
return ret;
}
static void fsl_espi_cmd_trans(struct spi_message *m,
struct fsl_espi_transfer *trans, u8 *rx_buff)
static int fsl_espi_cmd_trans(struct spi_message *m,
struct fsl_espi_transfer *trans, u8 *rx_buff)
{
struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
struct fsl_espi_transfer *espi_trans = trans;
int ret;
fsl_espi_copy_to_buf(m, mspi);
espi_trans->tx_buf = mspi->local_buf;
espi_trans->rx_buf = mspi->local_buf;
fsl_espi_do_trans(m, espi_trans);
ret = fsl_espi_do_trans(m, espi_trans);
espi_trans->actual_length = espi_trans->len;
return ret;
}
static void fsl_espi_rw_trans(struct spi_message *m,
struct fsl_espi_transfer *trans, u8 *rx_buff)
static int fsl_espi_rw_trans(struct spi_message *m,
struct fsl_espi_transfer *trans, u8 *rx_buff)
{
struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
unsigned int tx_only;
int ret;
tx_only = fsl_espi_copy_to_buf(m, mspi);
trans->tx_buf = mspi->local_buf;
trans->rx_buf = mspi->local_buf;
fsl_espi_do_trans(m, trans);
ret = fsl_espi_do_trans(m, trans);
if (!trans->status) {
if (!ret) {
/* If there is at least one RX byte then copy it to rx_buff */
if (trans->len > tx_only)
memcpy(rx_buff, trans->rx_buf + tx_only,
trans->len - tx_only);
trans->actual_length += trans->len;
}
return ret;
}
static int fsl_espi_do_one_msg(struct spi_master *master,
@ -358,6 +363,7 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
u8 *rx_buf = NULL;
unsigned int xfer_len = 0;
struct fsl_espi_transfer espi_trans;
int ret;
list_for_each_entry(t, &m->transfers, transfer_list) {
if (t->rx_buf)
@ -368,15 +374,14 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
espi_trans.len = xfer_len;
espi_trans.actual_length = 0;
espi_trans.status = 0;
if (!rx_buf)
fsl_espi_cmd_trans(m, &espi_trans, NULL);
ret = fsl_espi_cmd_trans(m, &espi_trans, NULL);
else
fsl_espi_rw_trans(m, &espi_trans, rx_buf);
ret = fsl_espi_rw_trans(m, &espi_trans, rx_buf);
m->actual_length = espi_trans.actual_length;
m->status = espi_trans.status;
m->status = ret;
spi_finalize_current_message(master);
return 0;
}