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spi: fsl-espi: factor out filling the local buffer

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Better structure the code by factoring out filling the local buffer.

In addition don't initialize the complete local buffer at the
beginning of fsl_espi_do_one_msg. Instead move initialization of
those parts of the local buffer to be used for transfers w/o tx_buf
to fsl_espi_copy_to_buf.

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 22:50:53 +02:00 committed by Mark Brown
parent 1423877b73
commit 7c159aa8c1
1 changed files with 24 additions and 22 deletions
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46
drivers/spi/spi-fsl-espi.c
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@ -85,6 +85,27 @@ struct fsl_espi_transfer {
#define AUTOSUSPEND_TIMEOUT 2000
static unsigned int fsl_espi_copy_to_buf(struct spi_message *m,
struct mpc8xxx_spi *mspi)
{
unsigned int tx_only = 0;
struct spi_transfer *t;
u8 *buf = mspi->local_buf;
list_for_each_entry(t, &m->transfers, transfer_list) {
if (t->tx_buf) {
memcpy(buf, t->tx_buf, t->len);
if (!t->rx_buf)
tx_only += t->len;
} else {
memset(buf, 0, t->len);
}
buf += t->len;
}
return tx_only;
}
static void fsl_espi_change_mode(struct spi_device *spi)
{
struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master);
@ -298,16 +319,9 @@ static void 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 spi_transfer *t;
int i = 0;
struct fsl_espi_transfer *espi_trans = trans;
list_for_each_entry(t, &m->transfers, transfer_list) {
if (t->tx_buf) {
memcpy(mspi->local_buf + i, t->tx_buf, t->len);
i += t->len;
}
}
fsl_espi_copy_to_buf(m, mspi);
espi_trans->tx_buf = mspi->local_buf;
espi_trans->rx_buf = mspi->local_buf;
@ -320,18 +334,9 @@ static void 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);
struct spi_transfer *t;
unsigned int tx_only = 0;
int i = 0;
unsigned int tx_only;
list_for_each_entry(t, &m->transfers, transfer_list) {
if (t->tx_buf) {
memcpy(mspi->local_buf + i, t->tx_buf, t->len);
i += t->len;
if (!t->rx_buf)
tx_only += t->len;
}
}
tx_only = fsl_espi_copy_to_buf(m, mspi);
trans->tx_buf = mspi->local_buf;
trans->rx_buf = mspi->local_buf;
@ -349,14 +354,11 @@ static void fsl_espi_rw_trans(struct spi_message *m,
static int fsl_espi_do_one_msg(struct spi_master *master,
struct spi_message *m)
{
struct mpc8xxx_spi *mspi = spi_master_get_devdata(master);
struct spi_transfer *t;
u8 *rx_buf = NULL;
unsigned int xfer_len = 0;
struct fsl_espi_transfer espi_trans;
memset(mspi->local_buf, 0, SPCOM_TRANLEN_MAX);
list_for_each_entry(t, &m->transfers, transfer_list) {
if (t->rx_buf)
rx_buf = t->rx_buf;