leandrof/linux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

spi: fsl-espi: determine need for byte swap only once

Browse Source 
Determine need for byte swap only once and store it in new member
swab in struct fsl_espi.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Heiner Kallweit 2016-11-25 23:58:49 +01:00 committed by Mark Brown
parent f254e65ce2
commit e1cdee73df
1 changed files with 6 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/spi/spi-fsl-espi.c
View File

@ -98,6 +98,7 @@ struct fsl_espi {
const void *tx;
void *rx;
bool swab;
unsigned int rx_len;
unsigned int tx_len;
unsigned int rxskip;
@ -140,14 +141,14 @@ static void fsl_espi_memcpy_swab(void *to, const void *from,
struct spi_message *m,
struct spi_transfer *t)
{
struct fsl_espi *espi = spi_master_get_devdata(m->spi->master);
unsigned int len = t->len;
if (!(m->spi->mode & SPI_LSB_FIRST) || t->bits_per_word <= 8) {
if (!espi->swab) {
memcpy(to, from, len);
return;
}
/* In case of LSB-first and bits_per_word > 8 byte-swap all words */
while (len)
if (len >= 4) {
*(u32 *)to = swahb32p(from);
@ -384,6 +385,9 @@ static int fsl_espi_trans(struct spi_message *m, struct spi_transfer *trans)
struct spi_device *spi = m->spi;
int ret;
/* In case of LSB-first and bits_per_word > 8 byte-swap all words */
espi->swab = spi->mode & SPI_LSB_FIRST && trans->bits_per_word > 8;
espi->rxskip = fsl_espi_check_rxskip_mode(m);
if (trans->rx_nbits == SPI_NBITS_DUAL && !espi->rxskip) {
dev_err(espi->dev, "Dual output mode requires RXSKIP mode!\n");