linux-kernel - [PATCH 5.4 19/85] dmaengine: imx-dma: configure the generic DMA type to make it work

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Date:   Tue, 10 Aug 2021 19:29:52 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Juergen Borleis <jbe@...gutronix.de>,
        Vinod Koul <vkoul@...nel.org>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 19/85] dmaengine: imx-dma: configure the generic DMA type to make it work

From: Juergen Borleis <jbe@...gutronix.de>

[ Upstream commit 7199ddede9f0f2f68d41e6928e1c6c4bca9c39c0 ]

Commit dea7a9fbb009 ("dmaengine: imx-dma: remove dma_slave_config
direction usage") changes the method from a "configuration when called"
to an "configuration when used". Due to this, only the cyclic DMA type
gets configured correctly, while the generic DMA type is left
non-configured.

Without this additional call, the struct imxdma_channel::word_size member
is stuck at DMA_SLAVE_BUSWIDTH_UNDEFINED and imxdma_prep_slave_sg() always
returns NULL.

Signed-off-by: Juergen Borleis <jbe@...gutronix.de>
Fixes: dea7a9fbb009 ("dmaengine: imx-dma: remove dma_slave_config direction usage")
Link: https://lore.kernel.org/r/20210729071821.9857-1-jbe@pengutronix.de
Signed-off-by: Vinod Koul <vkoul@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/dma/imx-dma.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/dma/imx-dma.c b/drivers/dma/imx-dma.c
index 5c0fb3134825..5265182674eb 100644
--- a/drivers/dma/imx-dma.c
+++ b/drivers/dma/imx-dma.c
@@ -832,6 +832,8 @@ static struct dma_async_tx_descriptor *imxdma_prep_slave_sg(
 		dma_length += sg_dma_len(sg);
 	}
 
+	imxdma_config_write(chan, &imxdmac->config, direction);
+
 	switch (imxdmac->word_size) {
 	case DMA_SLAVE_BUSWIDTH_4_BYTES:
 		if (sg_dma_len(sgl) & 3 || sgl->dma_address & 3)
-- 
2.30.2