linux-kernel - [PATCH v2 1/4] dmaengine: xilinx_dma: populate dma caps properly

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Date:   Wed, 3 Jan 2018 12:12:08 +0530
From:   Kedareswara rao Appana <appana.durga.rao@...inx.com>
To:     <dan.j.williams@...el.com>, <vinod.koul@...el.com>,
        <michal.simek@...inx.com>, <appanad@...inx.com>, <lars@...afoo.de>,
        <akinobu.mita@...il.com>, <joabreu@...opsys.com>,
        <mike.looijmans@...ic.nl>, <kedare06@...il.com>
CC:     <dmaengine@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH v2 1/4] dmaengine: xilinx_dma: populate dma caps properly

When client driver uses dma_get_slave_caps() api,
it checks for certain fields of dma_device struct
currently driver is not settings the directions and addr_widths
fields resulting dma_get_slave_caps() returning failure.

This patch fixes this issue by populating proper values
to the struct dma_device directions and addr_widths fields.

Signed-off-by: Kedareswara rao Appana <appanad@...inx.com>
---
Changes for v2:
--> Improved commit message title and description 
as suggested by Vinod.

 drivers/dma/xilinx/xilinx_dma.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/dma/xilinx/xilinx_dma.c b/drivers/dma/xilinx/xilinx_dma.c
index 88d317d..21ac954 100644
--- a/drivers/dma/xilinx/xilinx_dma.c
+++ b/drivers/dma/xilinx/xilinx_dma.c
@@ -2398,6 +2398,7 @@ static int xilinx_dma_chan_probe(struct xilinx_dma_device *xdev,
 		chan->direction = DMA_MEM_TO_DEV;
 		chan->id = chan_id;
 		chan->tdest = chan_id;
+		xdev->common.directions = BIT(DMA_MEM_TO_DEV);
 
 		chan->ctrl_offset = XILINX_DMA_MM2S_CTRL_OFFSET;
 		if (xdev->dma_config->dmatype == XDMA_TYPE_VDMA) {
@@ -2415,6 +2416,7 @@ static int xilinx_dma_chan_probe(struct xilinx_dma_device *xdev,
 		chan->direction = DMA_DEV_TO_MEM;
 		chan->id = chan_id;
 		chan->tdest = chan_id - xdev->nr_channels;
+		xdev->common.directions |= BIT(DMA_DEV_TO_MEM);
 
 		chan->ctrl_offset = XILINX_DMA_S2MM_CTRL_OFFSET;
 		if (xdev->dma_config->dmatype == XDMA_TYPE_VDMA) {
@@ -2629,6 +2631,8 @@ static int xilinx_dma_probe(struct platform_device *pdev)
 		dma_cap_set(DMA_PRIVATE, xdev->common.cap_mask);
 	}
 
+	xdev->common.dst_addr_widths = BIT(addr_width / 8);
+	xdev->common.src_addr_widths = BIT(addr_width / 8);
 	xdev->common.device_alloc_chan_resources =
 				xilinx_dma_alloc_chan_resources;
 	xdev->common.device_free_chan_resources =
-- 
2.7.4