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iio: imu: adis: ensure proper DMA alignment

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Aligning the buffer to the L1 cache is not sufficient in some platforms
as they might have larger cacheline sizes for caches after L1 and thus,
we can't guarantee DMA safety.

That was the whole reason to introduce IIO_DMA_MINALIGN in [1]. Do the same
for the sigma_delta ADCs.

[1]: https://lore.kernel.org/linux-iio/20220508175712.647246-2-jic23@kernel.org/

Fixes: ccd2b52f4a ("staging:iio: Add common ADIS library")
Signed-off-by: Nuno Sa <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20240117-adis-improv-v1-1-7f90e9fad200@analog.com
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Nuno Sa 2024-01-17 14:10:49 +01:00 committed by Jonathan Cameron
parent f1dfcbaa7b
commit 8e98b87f51
1 changed files with 2 additions and 1 deletions
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3
include/linux/iio/imu/adis.h
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@ -11,6 +11,7 @@
#include <linux/spi/spi.h>
#include <linux/interrupt.h>
#include <linux/iio/iio.h>
#include <linux/iio/types.h>
#define ADIS_WRITE_REG(reg) ((0x80 | (reg)))
@ -131,7 +132,7 @@ struct adis {
unsigned long irq_flag;
void *buffer;
u8 tx[10] ____cacheline_aligned;
u8 tx[10] __aligned(IIO_DMA_MINALIGN);
u8 rx[4];
};