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mfd: cros_ec: spi: Calculate delay between transfers correctly 

To avoid spamming the EC we calculate the time between the previous
transfer and the current transfer and force a delay if the time delta
is too small.

However, a small miscalculation causes the delay period to be
far too short. Most noticably this impacts commands with a long
turnaround time such as EC firmware reads and writes.

Signed-off-by: David Hendricks <dhendrix@chromium.org>
Signed-off-by: Doug Anderson <dianders@chromium.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Andrew Bresticker <abrestic@chromium.org>
Tested-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
David Hendricks 2014-04-30 10:44:04 -07:00 committed by Lee Jones
parent d1cb4cc905
commit 1fe368665b
1 changed files with 1 additions and 1 deletions
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2
drivers/mfd/cros_ec_spi.c
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@ -219,7 +219,7 @@ static int cros_ec_command_spi_xfer(struct cros_ec_device *ec_dev,
ktime_get_ts(&ts); ktime_get_ts(&ts);
delay = timespec_to_ns(&ts) - ec_spi->last_transfer_ns; delay = timespec_to_ns(&ts) - ec_spi->last_transfer_ns;
if (delay < EC_SPI_RECOVERY_TIME_NS) if (delay < EC_SPI_RECOVERY_TIME_NS)
ndelay(delay); ndelay(EC_SPI_RECOVERY_TIME_NS - delay);
} }
/* Transmit phase - send our message */ /* Transmit phase - send our message */