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spi: change post transfer udelay() to usleep_range() for long delays 

The spi_transfer parameter delay_usecs allows specifying a time to wait
after transferring a spi message.  This wait can be quite long - some
devices, such as some Chrome OS ECs, require as much as 2000 usecs after
a SPI transaction, before it can respond.

(cf: arch/arm64/boot/dts/nvidia/tegra132-norrin.dts:
   google,cros-ec-spi-msg-delay = <2000>
)

Blocking a CPU for 2 msecs in a busy loop like this doesn't seem very
friendly to other processes, so change the blocking delay to a sleep
to allow other things to use this CPU (or so it can sleep).

This should be safe to do, because:
 (a) A post-transaction delay like this is always specified as a minimum
     wait time
 (b) A delay here is most likely not very time sensitive, as it occurs
     after all data has been transferred
 (c) This delay occurs in a non-critical section of the spi worker thread
     so where it is safe to sleep.

Two caveats:
 1) To avoid penalizing short delays, still use udelay for delays < 10us.
 2) usleep_range() very often picks the upper bound, an upper bounds 10%
    should be plenty.

Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Daniel Kurtz 2016-10-07 18:55:47 +08:00 committed by Mark Brown
parent 1001354ca3
commit 8244bd3ab4
1 changed files with 8 additions and 2 deletions
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10
drivers/spi/spi.c
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@ -1034,8 +1034,14 @@ static int spi_transfer_one_message(struct spi_master *master,
if (msg->status != -EINPROGRESS)
goto out;
if (xfer->delay_usecs)
udelay(xfer->delay_usecs);
if (xfer->delay_usecs) {
u16 us = xfer->delay_usecs;
if (us <= 10)
udelay(us);
else
usleep_range(us, us + DIV_ROUND_UP(us, 10));
}
if (xfer->cs_change) {
if (list_is_last(&xfer->transfer_list,