linux-kernel - Re: [PATCH] drivers: usb: dwc3 : Configure DMA properties and ops from DT

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Message-ID: <874maefe6h.fsf@intel.com>
Date:	Wed, 04 May 2016 10:57:42 +0300
From:	Felipe Balbi <felipe.balbi@...ux.intel.com>
To:	Rajesh Bhagat <rajesh.bhagat@....com>, linux-usb@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, gregkh@...uxfoundation.org,
	leoyang.li@....com, sriram.dash@....com,
	Rajesh Bhagat <rajesh.bhagat@....com>
Subject: Re: [PATCH] drivers: usb: dwc3 : Configure DMA properties and ops from DT


Hi,

Rajesh Bhagat <rajesh.bhagat@....com> writes:
> On certain platforms (e.g. ARM64) the dma_ops needs to be explicitly set
> to be able to do DMA allocations, so use the of_dma_configure() helper
> to populate the dma properties and assign an appropriate dma_ops.
>
> Signed-off-by: Rajesh Bhagat <rajesh.bhagat@....com>
> Reviewed-by: Yang-Leo Li <leoyang.li@....com>

Cool, nxp is also using dwc3 :-) C'mon Rajesh, send us a glue layer :)

> diff --git a/drivers/usb/dwc3/host.c b/drivers/usb/dwc3/host.c
> index c679f63..4d5b783 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"
>  
> @@ -32,6 +33,9 @@ int dwc3_host_init(struct dwc3 *dwc)
>  		return -ENOMEM;
>  	}
>  
> +	if (IS_ENABLED(CONFIG_OF) && dwc->dev->of_node)
> +		of_dma_configure(&xhci->dev, dwc->dev->of_node);

okay, so we have a long discussion about this going on. You can catch up
with it starting here:

http://marc.info/?i=1461612094-30939-1-git-send-email-grygorii.strashko@ti.com

At least for now, this patch will be applied. We need to have a better
solution for this, one that helps not only DT platforms.

-- 
balbi

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