linux-kernel - Re: [PATCH] dmaengine: bam-dma: fill slave directions bit mask

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Message-ID: <54F82561.9000609@mm-sol.com>
Date:	Thu, 05 Mar 2015 11:44:01 +0200
From:	Stanimir Varbanov <svarbanov@...sol.com>
To:	Andy Gross <agross@...eaurora.org>
CC:	Vinod Koul <vinod.koul@...el.com>,
	Stanimir Varbanov <stanimir.varbanov@...aro.org>,
	Dan Williams <dan.j.williams@...el.com>,
	dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH] dmaengine: bam-dma: fill slave directions bit mask

On 03/04/2015 09:44 PM, Andy Gross wrote:
> On Wed, Mar 04, 2015 at 09:32:13PM +0530, Vinod Koul wrote:
>> On Wed, Mar 04, 2015 at 05:25:10PM +0200, Stanimir Varbanov wrote:
>>> This will avoid warning during async device registration.
>>>
>>> Signed-off-by: Stanimir Varbanov <stanimir.varbanov@...aro.org>
>>> ---
>>>  drivers/dma/qcom_bam_dma.c |    1 +
>>>  1 files changed, 1 insertions(+), 0 deletions(-)
>>>
>>> diff --git a/drivers/dma/qcom_bam_dma.c b/drivers/dma/qcom_bam_dma.c
>>> index c3113e3..cc9e5ee 100644
>>> --- a/drivers/dma/qcom_bam_dma.c
>>> +++ b/drivers/dma/qcom_bam_dma.c
>>> @@ -1143,6 +1143,7 @@ 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.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;
>> You need to fill other fields, src/dstn_addr_widths and
>> residue_granularity...
> 
> Add segment granularity for BAM, as we can read the current completed segment.
> bdev->common.residue_granularity = DMA_RESIDUE_GRANULARITY_SEGMENT;
> 
> Use DMA_SLAVE_BUSWIDTH_4_BYTES for the src/dst addr width:
> bdev->common.src_addr_widths = DMA_SLAVE_BUSWIDTH_4_BYTES;
> bdev->common.dst_addr_widths = DMA_SLAVE_BUSWIDTH_4_BYTES;
> 

Thanks Andy, will add those fields too.

-- 
regards,
Stan
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