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spi: spi-fsl-espi: convert transfer delay to spi_delay format

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The way the max delay is computed for this controller, it looks like it is
searching for the max delay from an SPI message a using that.

No idea if this is valid. But this change should support both `delay_usecs`
and the new `delay` data which is of `spi_delay` type.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Link: https://lore.kernel.org/r/20190926105147.7839-17-alexandru.ardelean@analog.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Alexandru Ardelean 2019-09-26 13:51:44 +03:00 committed by Mark Brown
parent 25093bdeb6
commit 3984d39b0e
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
3 changed files with 19 additions and 7 deletions
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16
drivers/spi/spi-fsl-espi.c
View File

@ -437,6 +437,7 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
struct spi_message *m)
{
unsigned int delay_usecs = 0, rx_nbits = 0;
unsigned int delay_nsecs = 0, delay_nsecs1 = 0;
struct spi_transfer *t, trans = {};
int ret;
@ -445,8 +446,16 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
goto out;
list_for_each_entry(t, &m->transfers, transfer_list) {
if (t->delay_usecs > delay_usecs)
delay_usecs = t->delay_usecs;
if (t->delay_usecs) {
if (t->delay_usecs > delay_usecs) {
delay_usecs = t->delay_usecs;
delay_nsecs = delay_usecs * 1000;
}
} else {
delay_nsecs1 = spi_delay_to_ns(&t->delay, t);
if (delay_nsecs1 > delay_nsecs)
delay_nsecs = delay_nsecs1;
}
if (t->rx_nbits > rx_nbits)
rx_nbits = t->rx_nbits;
}
@ -457,7 +466,8 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
trans.len = m->frame_length;
trans.speed_hz = t->speed_hz;
trans.bits_per_word = t->bits_per_word;
trans.delay_usecs = delay_usecs;
trans.delay.value = delay_nsecs;
trans.delay.unit = SPI_DELAY_UNIT_NSECS;
trans.rx_nbits = rx_nbits;
if (trans.len)

9
drivers/spi/spi.c
View File

@ -1120,7 +1120,7 @@ static void _spi_transfer_delay_ns(u32 ns)
}
}
static int _spi_delay_to_ns(struct spi_delay *_delay, struct spi_transfer *xfer)
int spi_delay_to_ns(struct spi_delay *_delay, struct spi_transfer *xfer)
{
u32 delay = _delay->value;
u32 unit = _delay->unit;
@ -1153,6 +1153,7 @@ static int _spi_delay_to_ns(struct spi_delay *_delay, struct spi_transfer *xfer)
return delay;
}
EXPORT_SYMBOL_GPL(spi_delay_to_ns);
int spi_delay_exec(struct spi_delay *_delay, struct spi_transfer *xfer)
{
@ -1161,7 +1162,7 @@ int spi_delay_exec(struct spi_delay *_delay, struct spi_transfer *xfer)
if (!_delay)
return -EINVAL;
delay = _spi_delay_to_ns(_delay, xfer);
delay = spi_delay_to_ns(_delay, xfer);
if (delay < 0)
return delay;
@ -3333,11 +3334,11 @@ static int _spi_xfer_word_delay_update(struct spi_transfer *xfer,
{
int delay1, delay2;
delay1 = _spi_delay_to_ns(&xfer->word_delay, xfer);
delay1 = spi_delay_to_ns(&xfer->word_delay, xfer);
if (delay1 < 0)
return delay1;
delay2 = _spi_delay_to_ns(&spi->word_delay, xfer);
delay2 = spi_delay_to_ns(&spi->word_delay, xfer);
if (delay2 < 0)
return delay2;

1
include/linux/spi/spi.h
View File

@ -103,6 +103,7 @@ struct spi_delay {
u8 unit;
};
extern int spi_delay_to_ns(struct spi_delay *_delay, struct spi_transfer *xfer);
extern int spi_delay_exec(struct spi_delay *_delay, struct spi_transfer *xfer);
/**