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driver, iio, mpuxxx: increase spi speed to 20Mhz when read sensor data

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Change-Id: Ic8088d26ba87386d39014e6ca25f1b43865af914
Signed-off-by: Zorro Liu <lyx@rock-chips.com>
This commit is contained in:
Zorro Liu
2016-06-16 17:56:50 +08:00
parent 2685b36475
commit 445814618d
1 changed files with 9 additions and 1 deletions
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10
drivers/staging/iio/imu/inv_mpu/inv_mpu_spi.c
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@@ -43,6 +43,7 @@ static int inv_spi_read(struct inv_mpu_iio_s *st, u8 reg, int len, u8 *data)
struct spi_message msg;
int res;
u8 d[2];
struct spi_device *spi = to_spi_device(st->dev);
struct spi_transfer xfers[] = {
{
.tx_buf = d,
@@ -61,10 +62,15 @@ static int inv_spi_read(struct inv_mpu_iio_s *st, u8 reg, int len, u8 *data)
d[0] = (reg | INV_SPI_READ);
if ((reg == REG_FIFO_R_W) || (reg == FIFO_COUNT_BYTE))
spi->max_speed_hz = 20000000;
else
spi->max_speed_hz = 1000000;
spi_message_init(&msg);
spi_message_add_tail(&xfers[0], &msg);
spi_message_add_tail(&xfers[1], &msg);
res = spi_sync(to_spi_device(st->dev), &msg);
res = spi_sync(spi, &msg);
return res;
}
@@ -74,6 +80,7 @@ static int inv_spi_single_write(struct inv_mpu_iio_s *st, u8 reg, u8 data)
struct spi_message msg;
int res;
u8 d[2];
struct spi_device *spi = to_spi_device(st->dev);
struct spi_transfer xfers = {
.tx_buf = d,
.bits_per_word = 8,
@@ -82,6 +89,7 @@ static int inv_spi_single_write(struct inv_mpu_iio_s *st, u8 reg, u8 data)
d[0] = reg;
d[1] = data;
spi->max_speed_hz = 1000000;
spi_message_init(&msg);
spi_message_add_tail(&xfers, &msg);
res = spi_sync(to_spi_device(st->dev), &msg);