summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorIvan Mikhaylov <i.mikhaylov@yadro.com>2021-07-22 17:44:18 +0200
committerJonathan Cameron <Jonathan.Cameron@huawei.com>2021-07-24 17:00:55 +0200
commitf5e9e38e7063dbe2c811bb5ee7d255318eb064b3 (patch)
treea1577ef020f624e88e26c6d87f1c7e02e53174fb
parentiio: st-sensors: Remove some unused includes and add some that should be there (diff)
downloadlinux-f5e9e38e7063dbe2c811bb5ee7d255318eb064b3.tar.xz
linux-f5e9e38e7063dbe2c811bb5ee7d255318eb064b3.zip
iio: proximity: vcnl3020: add DMA safe buffer
Add DMA safe buffer for bulk transfers. Signed-off-by: Ivan Mikhaylov <i.mikhaylov@yadro.com> Link: https://lore.kernel.org/r/20210722154420.915082-2-i.mikhaylov@yadro.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
-rw-r--r--drivers/iio/proximity/vcnl3020.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/iio/proximity/vcnl3020.c b/drivers/iio/proximity/vcnl3020.c
index 43817f6b3086..c90f9c6e9e97 100644
--- a/drivers/iio/proximity/vcnl3020.c
+++ b/drivers/iio/proximity/vcnl3020.c
@@ -57,12 +57,14 @@ static const int vcnl3020_prox_sampling_frequency[][2] = {
* @dev: vcnl3020 device.
* @rev: revision id.
* @lock: lock for protecting access to device hardware registers.
+ * @buf: DMA safe __be16 buffer.
*/
struct vcnl3020_data {
struct regmap *regmap;
struct device *dev;
u8 rev;
struct mutex lock;
+ __be16 buf ____cacheline_aligned;
};
/**
@@ -144,7 +146,6 @@ static int vcnl3020_measure_proximity(struct vcnl3020_data *data, int *val)
{
int rc;
unsigned int reg;
- __be16 res;
mutex_lock(&data->lock);
@@ -163,12 +164,12 @@ static int vcnl3020_measure_proximity(struct vcnl3020_data *data, int *val)
}
/* high & low result bytes read */
- rc = regmap_bulk_read(data->regmap, VCNL_PS_RESULT_HI, &res,
- sizeof(res));
+ rc = regmap_bulk_read(data->regmap, VCNL_PS_RESULT_HI, &data->buf,
+ sizeof(data->buf));
if (rc)
goto err_unlock;
- *val = be16_to_cpu(res);
+ *val = be16_to_cpu(data->buf);
err_unlock:
mutex_unlock(&data->lock);