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>

1 files changed, 8 insertions, 2 deletions

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 5787b723b593..42f3e1cb9212 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -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,