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| author | Alexandru Ardelean <alexandru.ardelean@analog.com> | 2019-09-26 12:51:31 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2019-10-15 12:41:47 +0200 |
| commit | 329f0dac4cad9fa4b1439a88180d91bcb5c4eaf8 (patch) | |
| tree | 4fa784efc9999e85944f4b01a1aaed93032cf325 /drivers/spi/spi.c | |
| parent | spi: introduce spi_delay struct as "value + unit" & spi_delay_exec() (diff) | |
| download | linux-329f0dac4cad9fa4b1439a88180d91bcb5c4eaf8.tar.xz linux-329f0dac4cad9fa4b1439a88180d91bcb5c4eaf8.zip | |
spi: make `cs_change_delay` the first user of the `spi_delay` logic
Since the logic for `spi_delay` struct + `spi_delay_exec()` has been copied
from the `cs_change_delay` logic, it's natural to make this delay, the
first user.
The `cs_change_delay` logic requires that the default remain 10 uS, in case
it is unspecified/unconfigured. So, there is some special handling needed
to do that.
The ADIS library is one of the few users of the new `cs_change_delay`
parameter for an spi_transfer.
The introduction of the `spi_delay` struct, requires that the users of of
`cs_change_delay` get an update. This change also updates the ADIS library.
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Link: https://lore.kernel.org/r/20190926105147.7839-4-alexandru.ardelean@analog.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/spi.c')
| -rw-r--r-- | drivers/spi/spi.c | 28 |
1 files changed, 7 insertions, 21 deletions
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 7499a4efbaba..b69c14082c52 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -1160,9 +1160,9 @@ EXPORT_SYMBOL_GPL(spi_delay_exec); static void _spi_transfer_cs_change_delay(struct spi_message *msg, struct spi_transfer *xfer) { - u32 delay = xfer->cs_change_delay; - u32 unit = xfer->cs_change_delay_unit; - u32 hz; + u32 delay = xfer->cs_change_delay.value; + u32 unit = xfer->cs_change_delay.unit; + int ret; /* return early on "fast" mode - for everything but USECS */ if (!delay) { @@ -1171,27 +1171,13 @@ static void _spi_transfer_cs_change_delay(struct spi_message *msg, return; } - switch (unit) { - case SPI_DELAY_UNIT_USECS: - delay *= 1000; - break; - case SPI_DELAY_UNIT_NSECS: /* nothing to do here */ - break; - case SPI_DELAY_UNIT_SCK: - /* if there is no effective speed know, then approximate - * by underestimating with half the requested hz - */ - hz = xfer->effective_speed_hz ?: xfer->speed_hz / 2; - delay *= DIV_ROUND_UP(1000000000, hz); - break; - default: + ret = spi_delay_exec(&xfer->cs_change_delay, xfer); + if (ret) { dev_err_once(&msg->spi->dev, "Use of unsupported delay unit %i, using default of 10us\n", - xfer->cs_change_delay_unit); - delay = 10000; + unit); + _spi_transfer_delay_ns(10000); } - /* now sleep for the requested amount of time */ - _spi_transfer_delay_ns(delay); } /* |