linux-kernel - [PATCH v2] dmaengine: bam-dma: fix a warning about missing capabilities

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Message-Id: <1425560584-3721-1-git-send-email-stanimir.varbanov@linaro.org>
Date:	Thu,  5 Mar 2015 15:03:04 +0200
From:	Stanimir Varbanov <stanimir.varbanov@...aro.org>
To:	Vinod Koul <vinod.koul@...el.com>
Cc:	Dan Williams <dan.j.williams@...el.com>, dmaengine@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: [PATCH v2] dmaengine: bam-dma: fix a warning about missing capabilities

Avoid the warning below triggered during dmaengine async device
registration.

WARNING: CPU: 1 PID: 1 at linux/drivers/dma/dmaengine.c:863
dma_async_device_register+0x2a8/0x4b8()
this driver doesn't support generic slave capabilities reporting

To do that fill mandatory .directions bit mask,
.src/dst_addr_widths and .residue_granularity dma_device fields
with appropriate values.

Signed-off-by: Stanimir Varbanov <stanimir.varbanov@...aro.org>
---

v1 -> v2

  - the patch subject has been changed
  - now fill also .residue_granularity and src/dts_addr_widths
  - added the warning in patch description

v1 can be found at https://lkml.org/lkml/2015/3/4/896

 drivers/dma/qcom_bam_dma.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/drivers/dma/qcom_bam_dma.c b/drivers/dma/qcom_bam_dma.c
index c3113e3..9c914d6 100644
--- a/drivers/dma/qcom_bam_dma.c
+++ b/drivers/dma/qcom_bam_dma.c
@@ -1143,6 +1143,10 @@ static int bam_dma_probe(struct platform_device *pdev)
 	dma_cap_set(DMA_SLAVE, bdev->common.cap_mask);
 
 	/* initialize dmaengine apis */
+	bdev->common.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
+	bdev->common.residue_granularity = DMA_RESIDUE_GRANULARITY_SEGMENT;
+	bdev->common.src_addr_widths = DMA_SLAVE_BUSWIDTH_4_BYTES;
+	bdev->common.dst_addr_widths = DMA_SLAVE_BUSWIDTH_4_BYTES;
 	bdev->common.device_alloc_chan_resources = bam_alloc_chan;
 	bdev->common.device_free_chan_resources = bam_free_chan;
 	bdev->common.device_prep_slave_sg = bam_prep_slave_sg;
-- 
1.7.0.4

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