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

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Date:	Sun, 24 Jul 2016 12:12:56 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	Sinan Kaya <okaya@...eaurora.org>
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

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..

> +       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..

> +       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.

Thanks
-- 
~Vinod