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dm: spi: Avoid setting the speed with every transfer 

Only set the speed if it has changed from last time. Since the speed will
be 0 when the device is probed it will always be changed on the first
transfer after the device is probed.

Signed-off-by: Simon Glass <sjg@chromium.org>
utp
Simon Glass 2015-02-17 15:29:35 -07:00
parent 172a31bf87
commit 60e2809a84
2 changed files with 9 additions and 3 deletions
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9
drivers/spi/spi-uclass.c
View File

@ -63,9 +63,12 @@ int spi_claim_bus(struct spi_slave *slave)
}
if (!speed)
speed = 100000;
ret = spi_set_speed_mode(bus, speed, slave->mode);
if (ret)
return ret;
if (speed != slave->speed) {
ret = spi_set_speed_mode(bus, speed, slave->mode);
if (ret)
return ret;
slave->speed = speed;
}
return ops->claim_bus ? ops->claim_bus(dev) : 0;
}

3
include/spi.h
View File

@ -100,6 +100,8 @@ struct dm_spi_slave_platdata {
* @dev: SPI slave device
* @max_hz: Maximum speed for this slave
* @mode: SPI mode to use for this slave (see SPI mode flags)
* @speed: Current bus speed. This is 0 until the bus is first
* claimed.
* @bus: ID of the bus that the slave is attached to. For
* driver model this is the sequence number of the SPI
* bus (bus->seq) so does not need to be stored
@ -117,6 +119,7 @@ struct spi_slave {
#ifdef CONFIG_DM_SPI
struct udevice *dev; /* struct spi_slave is dev->parentdata */
uint max_hz;
uint speed;
uint mode;
#else
unsigned int bus;