linux-kernel - [PATCH] spi: rockchip-sfc: Embedded DMA only support 4B aligned address

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Message-Id: <20241118145646.2609039-1-jon.lin@rock-chips.com>
Date: Mon, 18 Nov 2024 22:56:46 +0800
From: Jon Lin <jon.lin@...k-chips.com>
To: broonie@...nel.org
Cc: linux-rockchip@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	heiko@...ech.de,
	jon.lin@...k-chips.com,
	linux-arm-kernel@...ts.infradead.org,
	linux-spi@...r.kernel.org
Subject: [PATCH] spi: rockchip-sfc: Embedded DMA only support 4B aligned address

Controller limitations.

Signed-off-by: Jon Lin <jon.lin@...k-chips.com>
---

 drivers/spi/spi-rockchip-sfc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/spi/spi-rockchip-sfc.c b/drivers/spi/spi-rockchip-sfc.c
index 316e3db88492..69d0f2175568 100644
--- a/drivers/spi/spi-rockchip-sfc.c
+++ b/drivers/spi/spi-rockchip-sfc.c
@@ -503,7 +503,7 @@ static int rockchip_sfc_exec_mem_op(struct spi_mem *mem, const struct spi_mem_op
 	rockchip_sfc_adjust_op_work((struct spi_mem_op *)op);
 	rockchip_sfc_xfer_setup(sfc, mem, op, len);
 	if (len) {
-		if (likely(sfc->use_dma) && len >= SFC_DMA_TRANS_THRETHOLD) {
+		if (likely(sfc->use_dma) && len >= SFC_DMA_TRANS_THRETHOLD && !(len & 0x3)) {
 			init_completion(&sfc->cp);
 			rockchip_sfc_irq_unmask(sfc, SFC_IMR_DMA);
 			ret = rockchip_sfc_xfer_data_dma(sfc, op, len);
-- 
2.34.1