From: Andy Shevchenko andriy.shevchenko@linux.intel.com
[ Upstream commit 3cb97e223d277f84171cc4ccecab31e08b2ee7b5 ]
Some DMA controller drivers do not tolerate non-zero values in the DMA configuration structures. Zero them to avoid issues with such DMA controller drivers. Even despite above this is a good practice per se.
Fixes: 7063c0d942a1 ("spi/dw_spi: add DMA support") Signed-off-by: Andy Shevchenko andriy.shevchenko@linux.intel.com Acked-by: Feng Tang feng.tang@intel.com Cc: Feng Tang feng.tang@intel.com Link: https://lore.kernel.org/r/20200506153025.21441-1-andriy.shevchenko@linux.int... Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/spi/spi-dw-mid.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/spi/spi-dw-mid.c b/drivers/spi/spi-dw-mid.c index 0d86c37e0aeb..1058b8a6c8a0 100644 --- a/drivers/spi/spi-dw-mid.c +++ b/drivers/spi/spi-dw-mid.c @@ -147,6 +147,7 @@ static struct dma_async_tx_descriptor *dw_spi_dma_prepare_tx(struct dw_spi *dws, if (!xfer->tx_buf) return NULL;
+ memset(&txconf, 0, sizeof(txconf)); txconf.direction = DMA_MEM_TO_DEV; txconf.dst_addr = dws->dma_addr; txconf.dst_maxburst = 16; @@ -193,6 +194,7 @@ static struct dma_async_tx_descriptor *dw_spi_dma_prepare_rx(struct dw_spi *dws, if (!xfer->rx_buf) return NULL;
+ memset(&rxconf, 0, sizeof(rxconf)); rxconf.direction = DMA_DEV_TO_MEM; rxconf.src_addr = dws->dma_addr; rxconf.src_maxburst = 16;