linux-kernel - Re: [PATCH v3 5/6] usb: dwc3: use bus->sysdev for DMA configuration

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Message-ID: <87fumzha30.fsf@linux.intel.com>
Date:   Thu, 10 Nov 2016 13:02:11 +0200
From:   Felipe Balbi <felipe.balbi@...ux.intel.com>
To:     Sriram Dash <sriram.dash@....com>, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org
Cc:     mathias.nyman@...el.com, gregkh@...uxfoundation.org,
        suresh.gupta@....com, stern@...land.harvard.edu, pku.leo@...il.com,
        Arnd Bergmann <arnd@...db.de>,
        Sriram Dash <sriram.dash@....com>
Subject: Re: [PATCH v3 5/6] usb: dwc3: use bus->sysdev for DMA configuration


Hi,

Sriram Dash <sriram.dash@....com> writes:
> From: Arnd Bergmann <arnd@...db.de>
>
> The dma ops for dwc3 devices are not set properly. So, use a
> physical device sysdev, which will be inherited from parent,
> to set the hardware / firmware parameters like dma.
>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Signed-off-by: Sriram Dash <sriram.dash@....com>
> ---
> Changes in v3:
>   - No update
>
> Changes in v2:
>   - integrate dwc3 driver changes together
>
>  drivers/usb/dwc3/core.c   | 28 +++++++++++++++-------------
>  drivers/usb/dwc3/core.h   |  1 +
>  drivers/usb/dwc3/ep0.c    |  8 ++++----
>  drivers/usb/dwc3/gadget.c | 37 +++++++++++++++++++------------------
>  drivers/usb/dwc3/host.c   | 12 ++++--------
>  5 files changed, 43 insertions(+), 43 deletions(-)
>
> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> index 7287a76..0af0dc0 100644
> --- a/drivers/usb/dwc3/core.c
> +++ b/drivers/usb/dwc3/core.c
> @@ -25,6 +25,7 @@
>  #include <linux/slab.h>
>  #include <linux/spinlock.h>
>  #include <linux/platform_device.h>
> +#include <linux/pci.h>

I'd prefer to add a device property instead of checking for PCI bus type.

> @@ -943,6 +944,13 @@ static int dwc3_probe(struct platform_device *pdev)
>  	dwc = PTR_ALIGN(mem, DWC3_ALIGN_MASK + 1);
>  	dwc->mem = mem;
>  	dwc->dev = dev;
> +#ifdef CONFIG_PCI
> +	/* TODO: or some other way of detecting this? */
> +	if (dwc->dev->parent && dwc->dev->parent->bus == &pci_bus_type)
> +		dwc->sysdev = dwc->dev->parent;
> +	else
> +#endif

IOW:

        dwc->sysdev_is_parent = device_property_read_bool(dev,
        		"linux,sysdev_is_parent");

[...]

	if (dwc->sysdev_is_parent)
        	dwc->sysdev = dwc->dev->parent;
	else
        	dwc->sysdev = dwc->dev;

> @@ -112,9 +108,9 @@ int dwc3_host_init(struct dwc3 *dwc)
>  	return 0;
>  err2:
>  	phy_remove_lookup(dwc->usb2_generic_phy, "usb2-phy",
> -			  dev_name(&xhci->dev));
> +			  dev_name(dwc->dev));
>  	phy_remove_lookup(dwc->usb3_generic_phy, "usb3-phy",
> -			  dev_name(&xhci->dev));
> +			  dev_name(dwc->dev));
>  err1:
>  	platform_device_put(xhci);
>  	return ret;
> @@ -123,8 +119,8 @@ int dwc3_host_init(struct dwc3 *dwc)
>  void dwc3_host_exit(struct dwc3 *dwc)
>  {
>  	phy_remove_lookup(dwc->usb2_generic_phy, "usb2-phy",
> -			  dev_name(&dwc->xhci->dev));
> +			  dev_name(dwc->dev));
>  	phy_remove_lookup(dwc->usb3_generic_phy, "usb3-phy",
> -			  dev_name(&dwc->xhci->dev));
> +			  dev_name(dwc->dev));

this looks unrelated to $subject. Care to explain?

-- 
balbi

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