linux-kernel - RE: [PATCH] usb: gadget: udc-core: remove manual dma configuration

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Date:	Tue, 5 Apr 2016 06:27:18 +0000
From:	Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
To:	Grygorii Strashko <grygorii.strashko@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Felipe Balbi <balbi@...nel.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
CC:	Roger Quadros <rogerq@...com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	"nsekhar@...com" <nsekhar@...com>,
	Ruslan Bilovol <ruslan.bilovol@...il.com>
Subject: RE: [PATCH] usb: gadget: udc-core: remove manual dma configuration

Hi,

> From: Grygorii Strashko [mailto:grygorii.strashko@...com]
> Sent: Monday, April 04, 2016 8:32 PM
> 
> Since commit 7ace8fc8219e ("usb: gadget: udc: core: Fix argument of
> dma_map_single for IOMMU") it is not necessary to configure DMA for
> usb_gadget device manually, because all DMA operation are performed
> using parent/controller device.
> 
> Cc: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
> Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>

My environment could work correctly after I applied this patch.
So,

Tested-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>


I realized that the commit 7ace8fc8219e is not suitable for my environment.
(Especially I realized it could use all of DMAC channels when IOMMU was enabled.)
So, I will submit RFC patch set for udc-core.c / renesas_usbhs later :)

Best regards,
Yoshihiro Shimoda