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

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Date:	Thu, 31 Mar 2016 18:07:27 +0300
From:	Grygorii Strashko <grygorii.strashko@...com>
To:	Felipe Balbi <felipe.balbi@...ux.intel.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

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);
+
        ret = platform_device_add(xhci);
        if (ret) {
                dev_err(dwc->dev, "failed to register xHCI device\n");



-- 
regards,
-grygorii