| From 38d0cd2179791e27f06e1cfc6773f35b699ee99a Mon Sep 17 00:00:00 2001 |
| From: liya Li <ot_liya.li@mediatek.com> |
| Date: Thu, 2 Feb 2023 14:26:39 +0800 |
| Subject: [PATCH] [WCNCR00293802][kernel][MT7988] fix spi dma unmap |
| |
| [Description] |
| Use dma_unmap_single before memcpy to ensure that |
| CPU can get the latest and correct data |
| |
| [Release-log] |
| N/A |
| |
| Signed-off-by: liya Li <ot_liya.li@mediatek.com> |
| Change-Id: Ib0b51e34e289c670f0d020fb62a15078ed116203 |
| --- |
| drivers/spi/spi-mt65xx.c | 4 ++-- |
| 1 file changed, 2 insertions(+), 2 deletions(-) |
| |
| diff --git a/drivers/spi/spi-mt65xx.c b/drivers/spi/spi-mt65xx.c |
| index 1b272d15cc..2034d19790 100644 |
| --- a/drivers/spi/spi-mt65xx.c |
| +++ b/drivers/spi/spi-mt65xx.c |
| @@ -978,12 +978,12 @@ static int mtk_spi_mem_exec_op(struct spi_mem *mem, |
| |
| unmap_rx_dma: |
| if (op->data.dir == SPI_MEM_DATA_IN) { |
| + dma_unmap_single(mdata->dev, mdata->rx_dma, |
| + op->data.nbytes, DMA_FROM_DEVICE); |
| if(!IS_ALIGNED((size_t)op->data.buf.in, 4)) { |
| memcpy(op->data.buf.in, rx_tmp_buf, op->data.nbytes); |
| kfree(rx_tmp_buf); |
| } |
| - dma_unmap_single(mdata->dev, mdata->rx_dma, |
| - op->data.nbytes, DMA_FROM_DEVICE); |
| } |
| unmap_tx_dma: |
| dma_unmap_single(mdata->dev, mdata->tx_dma, |
| -- |
| 2.18.0 |
| |