linux-kernel - Re: [PATCH 10/10] dmaengine: qcom_hidma: add MSI support for interrupts

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Date:	Sun, 24 Jul 2016 10:38:11 -0400
From:	Sinan Kaya <okaya@...eaurora.org>
To:	Vinod Koul <vinod.koul@...el.com>
Cc:	"dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
	"timur@...eaurora.org" <timur@...eaurora.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"cov@...eaurora.org" <cov@...eaurora.org>,
	"jcm@...hat.com" <jcm@...hat.com>,
	"eric.auger@...aro.org" <eric.auger@...aro.org>,
	"agross@...eaurora.org" <agross@...eaurora.org>,
	"arnd@...db.de" <arnd@...db.de>,
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"Williams, Dan J" <dan.j.williams@...el.com>,
	Andy Shevchenko <andy.shevchenko@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 10/10] dmaengine: qcom_hidma: add MSI support for
 interrupts

Hi Vinod,

On 7/24/2016 2:42 AM, Vinod Koul wrote:
> On Tue, Jul 19, 2016 at 12:09:37AM +0530, Sinan Kaya wrote:
> 
>> @@ -567,6 +578,98 @@ static int hidma_create_sysfs_entry(struct hidma_dev *dev, char *name,
>>         return device_create_file(dev->ddev.dev, attrs);
>>  }
>>
>> +#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
> 
> This can be true on machine with your older HW, so I would be bit more
> careful here..

Correct, I tested the patch with new and old HW. The old HW won't attempt calling this function
since msi flag will be false.

> 
>> +       if (rc)
>> +               dev_warn(&pdev->dev,
>> +                        "failed to request MSI irq, falling back to wired IRQ\n");
>> +       return rc;
>> +#else
>> +       return -EINVAL;
> 
> -EINVAL doesnt sound apt here..

What should I use? -ENOENT ?

> 
>> +       struct acpi_device *adev = ACPI_COMPANION(dev);
>> +       const char *of_compat;
>> +       int ret;
>> +
>> +       if (!adev || acpi_disabled) {
>> +               ret = device_property_read_string(dev, "compatible",
>> +                                                 &of_compat);
>> +               if (ret)
>> +                       return false;
>> +
>> +               ret = strcmp(of_compat, "qcom,hidma-1.1");
>> +       } else {
>> +               ret = strcmp(acpi_device_hid(adev), "QCOM8062");
> 
> Okay if you ahve a device ID then why do we need new binding? This device as
> you said implies the support for MSI interrupts.


Yes, I do have a new device ID for platforms with MSI capability. 

Which new binding are you referring to?

> 
> Thanks
> 

Sinan

-- 
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.