linux-kernel - Re: [PATCH v3 2/2] usb:dwc3: pass arch data to xhci-hcd child

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Date:	Fri, 01 Apr 2016 10:58:31 +0300
From:	Felipe Balbi <felipe.balbi@...ux.intel.com>
To:	Grygorii Strashko <grygorii.strashko@...com>,
	"Thang Q. Nguyen" <tqnguyen@....com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, linux-omap@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm@...ts.infradead.org,
	Arnd Bergmann <arnd@...db.de>,
	"Karicheri\, Muralidharan" <m-karicheri2@...com>,
	Peter Ujfalusi <peter.ujfalusi@...com>, Phong Vo <pvo@....com>,
	Loc Ho <lho@....com>, patches <patches@....com>,
	Santosh Shilimkar <ssantosh@...nel.org>,
	"Ben Dooks \(embedded platforms\)" <ben-linux@...ff.org>
Subject: Re: [PATCH v3 2/2] usb:dwc3: pass arch data to xhci-hcd child


Hi,

Grygorii Strashko <grygorii.strashko@...com> writes:
> On 03/31/2016 11:04 AM, Felipe Balbi wrote:
>> "Thang Q. Nguyen" <tqnguyen@....com> writes:
>>> [ text/plain ]
>>> Thanks Grygorii for information.
>>> I checked but do not see dma_init_dev_from_parent is used in
>>> linux-next repository. Can you give me more information for what
>>> branch I can checkout to use it for USB DWC3?
>> 
>> dma_init_dev_from_parent() is still a proposal ;-)
>> 
>
> Felipe,
>
> After some experiments I came up with below fix (not common, but fixes USB
> case on keystone 2). if you agree with proposed fix I'll send proper
> patches to fix usb_add_gadget_udc_release() and dwc3_host_init() in the same
> way.
>
> diff --git a/drivers/usb/dwc3/host.c b/drivers/usb/dwc3/host.c
> index c679f63..3fe1c65 100644
> --- a/drivers/usb/dwc3/host.c
> +++ b/drivers/usb/dwc3/host.c
> @@ -17,6 +17,7 @@
>  
>  #include <linux/platform_device.h>
>  #include <linux/usb/xhci_pdriver.h>
> +#include <linux/of_device.h>
>  
>  #include "core.h"
>  
> @@ -35,8 +36,6 @@ int dwc3_host_init(struct dwc3 *dwc)
>         dma_set_coherent_mask(&xhci->dev, dwc->dev->coherent_dma_mask);
>  
>         xhci->dev.parent        = dwc->dev;
> -       xhci->dev.dma_mask      = dwc->dev->dma_mask;
> -       xhci->dev.dma_parms     = dwc->dev->dma_parms;
>  
>         dwc->xhci = xhci;
>  
> @@ -62,6 +61,12 @@ int dwc3_host_init(struct dwc3 *dwc)
>         phy_create_lookup(dwc->usb3_generic_phy, "usb3-phy",
>                           dev_name(&xhci->dev));
>  
> +       if (!dwc->dev->of_node) {
> +               xhci->dev.dma_mask      = dwc->dev->dma_mask;
> +               xhci->dev.dma_parms     = dwc->dev->dma_parms;
> +       } else 
> +               of_dma_configure(&xhci->dev, dwc->dev->of_node);

if of_dma_configure() does what you want, why don't you just stick it in
dwc3-keystone.c and let the driver continue to copy things for now ?
Something like below, perhaps ?

diff --git a/drivers/usb/dwc3/dwc3-keystone.c b/drivers/usb/dwc3/dwc3-keystone.c
index 2be268d2423d..a4bd7f16090f 100644
--- a/drivers/usb/dwc3/dwc3-keystone.c
+++ b/drivers/usb/dwc3/dwc3-keystone.c
@@ -39,8 +39,6 @@
 #define USBSS_IRQ_COREIRQ_EN	BIT(0)
 #define USBSS_IRQ_COREIRQ_CLR	BIT(0)
 
-static u64 kdwc3_dma_mask;
-
 struct dwc3_keystone {
 	struct device			*dev;
 	struct clk			*clk;
@@ -108,9 +106,7 @@ static int kdwc3_probe(struct platform_device *pdev)
 	if (IS_ERR(kdwc->usbss))
 		return PTR_ERR(kdwc->usbss);
 
-	kdwc3_dma_mask = dma_get_mask(dev);
-	dev->dma_mask = &kdwc3_dma_mask;
-
+	of_dma_configure(&kdwc->dev, node);
 	kdwc->clk = devm_clk_get(kdwc->dev, "usb");
 
 	error = clk_prepare_enable(kdwc->clk);


-- 
balbi

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