Messages in this thread | | | Date | Sat, 29 Jun 2013 09:21:48 +1000 | From | Ryan Mallon <> | Subject | Re: [PATCH 4/8] spi: spi-ep93xx: remove bits_per_word() helper |
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On 29/06/13 04:44, H Hartley Sweeten wrote:
> This inline helper function is only used to determine the bus width > of the current transfer (8 or 16 bit). Add a bool flag to the private > structure and set it appropriately for each transfer. > > Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com> > Cc: Ryan Mallon <rmallon@gmail.com> > Cc: Mika Westerberg <mika.westerberg@iki.fi> > Cc: Mark Brown <broonie@kernel.org> > Cc: Grant Likely <grant.likely@linaro.org> > --- > drivers/spi/spi-ep93xx.c | 16 +++++----------- > 1 file changed, 5 insertions(+), 11 deletions(-) > > diff --git a/drivers/spi/spi-ep93xx.c b/drivers/spi/spi-ep93xx.c > index bcfd35a..4fab3bb 100644 > --- a/drivers/spi/spi-ep93xx.c > +++ b/drivers/spi/spi-ep93xx.c > @@ -116,6 +116,7 @@ struct ep93xx_spi { > unsigned long min_rate; > unsigned long max_rate; > bool running; > + bool word_xfer;
I think this is a slightly confusing name. Maybe something like is_16bit_xfer would be better?
> struct workqueue_struct *wq; > struct work_struct msg_work; > struct completion wait; > @@ -407,17 +408,9 @@ static void ep93xx_spi_chip_setup(const struct ep93xx_spi *espi, > writew(cr0, espi->regs_base + SSPCR0); > } > > -static inline int bits_per_word(const struct ep93xx_spi *espi) > -{ > - struct spi_message *msg = espi->current_msg; > - struct spi_transfer *t = msg->state; > - > - return t->bits_per_word; > -} > - > static void ep93xx_do_write(struct ep93xx_spi *espi, struct spi_transfer *t) > { > - if (bits_per_word(espi) > 8) { > + if (espi->word_xfer) { > u16 tx_val = 0; > > if (t->tx_buf) > @@ -436,7 +429,7 @@ static void ep93xx_do_write(struct ep93xx_spi *espi, struct spi_transfer *t) > > static void ep93xx_do_read(struct ep93xx_spi *espi, struct spi_transfer *t) > { > - if (bits_per_word(espi) > 8) { > + if (espi->word_xfer) { > u16 rx_val; > > rx_val = readw(espi->regs_base + SSPDR); > @@ -522,7 +515,7 @@ ep93xx_spi_dma_prepare(struct ep93xx_spi *espi, enum dma_transfer_direction dir) > size_t len = t->len; > int i, ret, nents; > > - if (bits_per_word(espi) > 8) > + if (espi->word_xfer) > buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES; > else > buswidth = DMA_SLAVE_BUSWIDTH_1_BYTE; > @@ -699,6 +692,7 @@ static void ep93xx_spi_process_transfer(struct ep93xx_spi *espi, > > ep93xx_spi_chip_setup(espi, chip); > > + espi->word_xfer = (t->bits_per_word > 8) ? true : false;
espi->word_xfer = (t->bits_per_word > 8);
This patch is fine, but not sure it is entirely worth it. The information is already stored in t->bits_per_word and the cost of retrieving it is pretty minimal.
~Ryan
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