Commit dbf20809 authored by Nuno Sa's avatar Nuno Sa Committed by Jonathan Cameron
Browse files

iio: adis: add burst_max_speed_hz variable 



Typically, in burst mode, the device cannot operate at it's full spi
speed. Hence, the spi transfers for burst mode have to take this into
account. With this change we avoid a potential race with the spi core as
drivers were 'hacking' the device 'max_speed_hz' directly in the
trigger handler.

Reviewed-by: default avatarAlexandru Ardelean <ardeleanalex@gmail.com>
Signed-off-by: default avatarNuno Sa <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20210427085454.30616-5-nuno.sa@analog.com


Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent 669da56a

drivers/iio/imu/adis_buffer.c

+4 −0
Original line number Diff line number Diff line
@@ -51,9 +51,13 @@ static int adis_update_scan_mode_burst(struct iio_dev *indio_dev, 
	adis->xfer[0].tx_buf = tx;

	adis->xfer[0].bits_per_word = 8;

	adis->xfer[0].len = 2;

	if (adis->data->burst_max_speed_hz)

		adis->xfer[0].speed_hz = adis->data->burst_max_speed_hz;

	adis->xfer[1].rx_buf = adis->buffer;

	adis->xfer[1].bits_per_word = 8;

	adis->xfer[1].len = burst_length;

	if (adis->data->burst_max_speed_hz)

		adis->xfer[1].speed_hz = adis->data->burst_max_speed_hz;



	spi_message_init(&adis->msg);

	spi_message_add_tail(&adis->xfer[0], &adis->msg);

include/linux/iio/imu/adis.h

+2 −0
Original line number Diff line number Diff line
@@ -55,6 +55,7 @@ struct adis_timeout { 
 *			this should be the minimum size supported by the device.

 * @burst_max_len:	Holds the maximum burst size when the device supports

 *			more than one burst mode with different sizes

 * @burst_max_speed_hz:	Maximum spi speed that can be used in burst mode

 */

struct adis_data {

	unsigned int read_delay;
@@ -83,6 +84,7 @@ struct adis_data { 
	unsigned int burst_reg_cmd;

	unsigned int burst_len;

	unsigned int burst_max_len;

	unsigned int burst_max_speed_hz;

};



/**