iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

iio: adis: add burst_max_speed_hz variable

Browse Source 
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: Alexandru Ardelean <ardeleanalex@gmail.com>
Signed-off-by: Nuno Sa <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20210427085454.30616-5-nuno.sa@analog.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Nuno Sa 2021-04-27 10:54:52 +02:00 committed by Jonathan Cameron
parent 669da56a7e
commit dbf20809d6
2 changed files with 6 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/iio/imu/adis_buffer.c
View File

@ -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);

2
include/linux/iio/imu/adis.h
View File

@ -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;
};
/**