linux-kernel - Re: [PATCH V4 04/10] dmaengine: qcom_hidma: configure DMA and MSI for OF

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Date:   Sat, 1 Oct 2016 11:15:00 -0400
From:   Sinan Kaya <okaya@...eaurora.org>
To:     Vinod Koul <vinod.koul@...el.com>
Cc:     dmaengine@...r.kernel.org, timur@...eaurora.org,
        devicetree@...r.kernel.org, cov@...eaurora.org, jcm@...hat.com,
        agross@...eaurora.org, arnd@...db.de,
        linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Dan Williams <dan.j.williams@...el.com>,
        Wei Yongjun <yongjun_wei@...ndmicro.com.cn>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V4 04/10] dmaengine: qcom_hidma: configure DMA and MSI for
 OF

On 10/1/2016 2:17 AM, Vinod Koul wrote:
> On Wed, Sep 28, 2016 at 10:12:41PM -0400, Sinan Kaya wrote:
>> Configure the DMA bindings for the device tree based firmware.
>>
>> Signed-off-by: Sinan Kaya <okaya@...eaurora.org>
>> ---
>>  drivers/dma/qcom/hidma_mgmt.c | 5 ++++-
>>  1 file changed, 4 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/dma/qcom/hidma_mgmt.c b/drivers/dma/qcom/hidma_mgmt.c
>> index 82f36e4..e8f6b84 100644
>> --- a/drivers/dma/qcom/hidma_mgmt.c
>> +++ b/drivers/dma/qcom/hidma_mgmt.c
>> @@ -375,8 +375,11 @@ static int __init hidma_mgmt_of_populate_channels(struct device_node *np)
>>  			ret = PTR_ERR(new_pdev);
>>  			goto out;
>>  		}
>> +		of_node_get(child);
>> +		new_pdev->dev.of_node = child;
>>  		of_dma_configure(&new_pdev->dev, child);
>> -
>> +		of_msi_configure(&new_pdev->dev, child);
>> +		of_node_put(child);
> 
> should this be done unconditionally? Dont we needto call this only for
> platforms with msi?

I followed the pattern in of_platform_device_create_pdata function. of_msi_configure does
nothing if MSI is not enabled as irq_find_matching_host returns NULL. It didn't have any
side effects on my testing either.


> 
>>  		kfree(res);
>>  		res = NULL;
>>  	}
>> -- 
>> 1.9.1
>>
> 


-- 
Sinan Kaya
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.