linux-kernel - [PATCH] dma: imx-dma: configure the generic DMA type to make it work

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Date:   Thu, 29 Jul 2021 09:18:21 +0200
From:   Juergen Borleis <jbe@...gutronix.de>
To:     dmaengine@...r.kernel.org
Cc:     linux-imx@....com, festevam@...il.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        shawnguo@...nel.org, vkoul@...nel.org, kernel@...gutronix.de
Subject: [PATCH] dma: imx-dma: configure the generic DMA type to make it work

Commit dea7a9f
  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>
---
 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 7f116bb..2ddc31e 100644
--- a/drivers/dma/imx-dma.c
+++ b/drivers/dma/imx-dma.c
@@ -812,6 +812,8 @@ 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)
-- 
2.20.1