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iio: addac: ad74413r: Fix alignment for DMA safety

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[ Upstream commit 00eb2b8a077062557772234019ecd6045b8b6298 ]

____cacheline_aligned is an insufficient guarantee for non-coherent DMA
on platforms with 128 byte cachelines above L1.  Switch to the updated
IIO_DMA_MINALIGN definition.

Update the comment to include 'may'.

Fixes: fea251b6a5db ("iio: addac: add AD74413R driver")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Cosmin Tanislav <cosmin.tanislav@analog.com>
Acked-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20220508175712.647246-41-jic23@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jonathan Cameron 2022-05-08 18:56:20 +01:00 committed by Greg Kroah-Hartman
parent aebea06fb0
commit 5e6b52de1d
1 changed files with 2 additions and 2 deletions

4
drivers/iio/addac/ad74413r.c

@ -77,13 +77,13 @@ struct ad74413r_state {
struct spi_transfer adc_samples_xfer[AD74413R_CHANNEL_MAX + 1];
/*
* DMA (thus cache coherency maintenance) requires the
* DMA (thus cache coherency maintenance) may require the
* transfer buffers to live in their own cache lines.
*/
struct {
u8 rx_buf[AD74413R_FRAME_SIZE * AD74413R_CHANNEL_MAX];
s64 timestamp;
} adc_samples_buf ____cacheline_aligned;
} adc_samples_buf __aligned(IIO_DMA_MINALIGN);
u8 adc_samples_tx_buf[AD74413R_FRAME_SIZE * AD74413R_CHANNEL_MAX];
u8 reg_tx_buf[AD74413R_FRAME_SIZE];