target/linux/mediatek/patches-5.4/0920-kernel-MT7988-fix-spi-dma-unmap.patch

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