mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-08-28 03:40:04 +00:00
Code Issues Releases Wiki Activity

spi: au1550: Convert to let spi core handle checking transfer speed

Browse source 
By setting master->max_speed_hz and master->min_speed_hz, spi core will handle
checking transfer speed. So we can remove the same checking in this driver.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Axel Lin 2014-02-11 20:49:07 +08:00 committed by Mark Brown
parent 38dbfb59d1
commit 0dd26e53b5
1 changed files with 4 additions and 26 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

30
drivers/spi/spi-au1550.c
View file

@ -55,8 +55,6 @@ struct au1550_spi {
volatile psc_spi_t __iomem *regs;
int irq;
unsigned freq_max;
unsigned freq_min;
unsigned len;
unsigned tx_count;
@ -248,11 +246,8 @@ static int au1550_spi_setupxfer(struct spi_device *spi, struct spi_transfer *t)
hz = t->speed_hz;
}
if (hz > spi->max_speed_hz || hz > hw->freq_max || hz < hw->freq_min) {
dev_err(&spi->dev, "setupxfer: clock rate=%d out of range\n",
hz);
if (!hz)
return -EINVAL;
}
au1550_spi_bits_handlers_set(hw, spi->bits_per_word);
@ -287,23 +282,6 @@ static int au1550_spi_setupxfer(struct spi_device *spi, struct spi_transfer *t)
return 0;
}
static int au1550_spi_setup(struct spi_device *spi)
{
struct au1550_spi *hw = spi_master_get_devdata(spi->master);
if (spi->max_speed_hz == 0)
spi->max_speed_hz = hw->freq_max;
if (spi->max_speed_hz > hw->freq_max
|| spi->max_speed_hz < hw->freq_min)
return -EINVAL;
/*
* NOTE: cannot change speed and other hw settings immediately,
* otherwise sharing of spi bus is not possible,
* so do not call setupxfer(spi, NULL) here
*/
return 0;
}
/*
* for dma spi transfers, we have to setup rx channel, otherwise there is
* no reliable way how to recognize that spi transfer is done
@ -838,7 +816,6 @@ static int au1550_spi_probe(struct platform_device *pdev)
hw->bitbang.master = hw->master;
hw->bitbang.setup_transfer = au1550_spi_setupxfer;
hw->bitbang.chipselect = au1550_spi_chipsel;
hw->bitbang.master->setup = au1550_spi_setup;
hw->bitbang.txrx_bufs = au1550_spi_txrx_bufs;
if (hw->usedma) {
@ -909,8 +886,9 @@ static int au1550_spi_probe(struct platform_device *pdev)
{
int min_div = (2 << 0) * (2 * (4 + 1));
int max_div = (2 << 3) * (2 * (63 + 1));
hw->freq_max = hw->pdata->mainclk_hz / min_div;
hw->freq_min = hw->pdata->mainclk_hz / (max_div + 1) + 1;
master->max_speed_hz = hw->pdata->mainclk_hz / min_div;
master->min_speed_hz =
hw->pdata->mainclk_hz / (max_div + 1) + 1;
}
au1550_spi_setup_psc_as_spi(hw);