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From: Frank Li <Frank.Li@nxp.com>
To: gustavo.pimentel@synopsys.com, hongxing.zhu@nxp.com,
	l.stach@pengutronix.de, linux-imx@nxp.com,
	linux-pci@vger.kernel.org, dmaengine@vger.kernel.org,
	fancer.lancer@gmail.com, lznuaa@gmail.com
Cc: vkoul@kernel.org, lorenzo.pieralisi@arm.com, robh@kernel.org,
	kw@linux.com, bhelgaas@google.com, shawnguo@kernel.org,
	manivannan.sadhasivam@linaro.org
Subject: [PATCH v5 6/9] dmaengine: dw-edma: Don't rely on the deprecated "direction" member
Date: Thu, 10 Mar 2022 13:24:54 -0600	[thread overview]
Message-ID: <20220310192457.3090-7-Frank.Li@nxp.com> (raw)
In-Reply-To: <20220310192457.3090-1-Frank.Li@nxp.com>

From: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>

The "direction" member of the "dma_slave_config" structure is deprecated.
The clients no longer use this field to specify the direction of the slave
channel. But in the eDMA core, this field is used to differentiate between the
Root complex (remote) and Endpoint (local) DMA accesses.

Nevertheless, we can't differentiate between local and remote accesses without
a dedicated flag. So let's get rid of the old check and add a new check for
verifying the DMA operation between local and remote memory instead.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Frank Li <Frank.Li@nxp.com>
---
 drivers/dma/dw-edma/dw-edma-core.c | 17 ++---------------
 1 file changed, 2 insertions(+), 15 deletions(-)

diff --git a/drivers/dma/dw-edma/dw-edma-core.c b/drivers/dma/dw-edma/dw-edma-core.c
index 924f220007362..156255ce7744e 100644
--- a/drivers/dma/dw-edma/dw-edma-core.c
+++ b/drivers/dma/dw-edma/dw-edma-core.c
@@ -341,22 +341,9 @@ dw_edma_device_transfer(struct dw_edma_transfer *xfer)
 	if (!chan->configured)
 		return NULL;
 
-	switch (chan->config.direction) {
-	case DMA_DEV_TO_MEM: /* local DMA */
-		if (dir == DMA_DEV_TO_MEM && chan->dir == EDMA_DIR_READ)
-			break;
-		return NULL;
-	case DMA_MEM_TO_DEV: /* local DMA */
-		if (dir == DMA_MEM_TO_DEV && chan->dir == EDMA_DIR_WRITE)
-			break;
+	/* eDMA supports only read and write between local and remote memory */
+	if (dir != DMA_DEV_TO_MEM && dir != DMA_MEM_TO_DEV)
 		return NULL;
-	default: /* remote DMA */
-		if (dir == DMA_MEM_TO_DEV && chan->dir == EDMA_DIR_READ)
-			break;
-		if (dir == DMA_DEV_TO_MEM && chan->dir == EDMA_DIR_WRITE)
-			break;
-		return NULL;
-	}
 
 	if (xfer->type == EDMA_XFER_CYCLIC) {
 		if (!xfer->xfer.cyclic.len || !xfer->xfer.cyclic.cnt)
-- 
2.24.0.rc1


  parent reply	other threads:[~2022-03-10 19:25 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-03-10 19:24 [PATCH v5 0/9] Enable designware PCI EP EDMA locally Frank Li
2022-03-10 19:24 ` [PATCH v5 1/9] dmaengine: dw-edma: Detach the private data and chip info structures Frank Li
2022-03-10 19:24 ` [PATCH v5 2/9] dmaengine: dw-edma: remove unused field irq in struct dw_edma_chip Frank Li
2022-03-10 19:24 ` [PATCH v5 3/9] dmaengine: dw-edma: change rg_region to reg_base " Frank Li
2022-03-10 19:24 ` [PATCH v5 4/9] dmaengine: dw-edma: rename wr(rd)_ch_cnt to ll_wr(rd)_cnt " Frank Li
2022-03-10 19:24 ` [PATCH v5 5/9] dmaengine: dw-edma: Fix programming the source & dest addresses for ep Frank Li
2022-03-10 19:24 ` Frank Li [this message]
2022-03-10 19:24 ` [PATCH v5 7/9] dmaengine: dw-edma: Add support for chip specific flags Frank Li
2022-03-10 19:24 ` [PATCH v5 8/9] dmaengine: dw-edma: Add DW_EDMA_CHIP_32BIT_DBI " Frank Li
2022-03-10 19:24 ` [PATCH v5 9/9] PCI: endpoint: functions/pci-epf-test: Support PCI controller DMA Frank Li
2022-03-10 19:45 ` [PATCH v5 0/9] Enable designware PCI EP EDMA locally Serge Semin
2022-03-10 19:58   ` Zhi Li
2022-03-10 20:00   ` Serge Semin
2022-03-11 22:58 ` Bjorn Helgaas

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