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authorDavid Hendricks <dhendrix@chromium.org>2014-04-30 21:44:04 +0400
committerLee Jones <lee.jones@linaro.org>2014-06-03 11:11:46 +0400
commit1fe368665b1499041919d78467147849989af7c9 (patch)
treefc52e60331f7072b6c45790cfcb976f7129a324b /drivers/mfd
parentd1cb4cc9051110a0d4f6261e2e8e90398166a4c5 (diff)
downloadlinux-1fe368665b1499041919d78467147849989af7c9.tar.xz
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>
Diffstat (limited to 'drivers/mfd')
-rw-r--r--drivers/mfd/cros_ec_spi.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/mfd/cros_ec_spi.c b/drivers/mfd/cros_ec_spi.c
index 84af8d7a4295..c185eb67943f 100644
--- a/drivers/mfd/cros_ec_spi.c
+++ b/drivers/mfd/cros_ec_spi.c
@@ -219,7 +219,7 @@ static int cros_ec_command_spi_xfer(struct cros_ec_device *ec_dev,
ktime_get_ts(&ts);
delay = timespec_to_ns(&ts) - ec_spi->last_transfer_ns;
if (delay < EC_SPI_RECOVERY_TIME_NS)
- ndelay(delay);
+ ndelay(EC_SPI_RECOVERY_TIME_NS - delay);
}
/* Transmit phase - send our message */