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authorLinus Torvalds <torvalds@linux-foundation.org>2011-05-12 10:41:31 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-05-12 10:41:31 -0700
commit49f019c188aa1e0ed5c8cffbcc5533dfb0e732dd (patch)
tree4d60206230d1eb9182f1f565309cc90c6454c404 /drivers
parent6eaed0a438ef554a282210a04da0de27b671d817 (diff)
parent28350e330cfab46b60a1dbf763b678d859f9f3d9 (diff)
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input: Input: ads7846 - remove unused variable from struct ads7845_ser_req Input: ads7846 - make transfer buffers DMA safe
Diffstat (limited to 'drivers')
-rw-r--r--drivers/input/touchscreen/ads7846.c13
1 files changed, 10 insertions, 3 deletions
diff --git a/drivers/input/touchscreen/ads7846.c b/drivers/input/touchscreen/ads7846.c
index c24946f5125..1de1c19dad3 100644
--- a/drivers/input/touchscreen/ads7846.c
+++ b/drivers/input/touchscreen/ads7846.c
@@ -281,17 +281,24 @@ 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)