From 1fe368665b1499041919d78467147849989af7c9 Mon Sep 17 00:00:00 2001 From: David Hendricks Date: Wed, 30 Apr 2014 10:44:04 -0700 Subject: [PATCH] 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 Signed-off-by: Doug Anderson Reviewed-by: Simon Glass Tested-by: Andrew Bresticker Tested-by: Stephen Warren Signed-off-by: Lee Jones --- drivers/mfd/cros_ec_spi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) 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 */ -- 2.39.5