diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/input/touchscreen/ads7846.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/input/touchscreen/ads7846.c b/drivers/input/touchscreen/ads7846.c index c24946f5125..ab51a8dbdb5 100644 --- a/drivers/input/touchscreen/ads7846.c +++ b/drivers/input/touchscreen/ads7846.c @@ -281,17 +281,25 @@ struct ser_req { u8 command; u8 ref_off; u16 scratch; - __be16 sample; struct spi_message msg; struct spi_transfer xfer[6]; + /* + * DMA (thus cache coherency maintenance) requires the + * transfer buffers to live in their own cache lines. + */ + __be16 sample ____cacheline_aligned; }; struct ads7845_ser_req { u8 command[3]; u8 pwrdown[3]; - u8 sample[3]; struct spi_message msg; struct spi_transfer xfer[2]; + /* + * DMA (thus cache coherency maintenance) requires the + * transfer buffers to live in their own cache lines. + */ + u8 sample[3] ____cacheline_aligned; }; static int ads7846_read12_ser(struct device *dev, unsigned command) |