linux-kernel - RE: [PATCH v4] dma: Add Xilinx AXI Direct Memory Access Engine driver support

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Date:	Sat, 14 Feb 2015 14:21:52 +0000
From:	Appana Durga Kedareswara Rao <appana.durga.rao@...inx.com>
To:	Vinod Koul <vinod.koul@...el.com>
CC:	Arnd Bergmann <arnd@...db.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Srikanth Vemula <svemula@...inx.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Srikanth Thokala" <sthokal@...inx.com>,
	"dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	Michal Simek <michals@...inx.com>,
	Anirudha Sarangi <anirudh@...inx.com>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"dan.j.williams@...el.com" <dan.j.williams@...el.com>
Subject: RE: [PATCH v4] dma: Add Xilinx AXI Direct Memory Access Engine
 driver support

Hi Vinod,

> -----Original Message-----
> From: Vinod Koul [mailto:vinod.koul@...el.com]
> Sent: Thursday, February 12, 2015 3:05 PM
> To: Appana Durga Kedareswara Rao
> Cc: Arnd Bergmann; linux-arm-kernel@...ts.infradead.org;
> devicetree@...r.kernel.org; Srikanth Vemula; linux-
> kernel@...r.kernel.org; Srikanth Thokala; dmaengine@...r.kernel.org;
> robh+dt@...nel.org; Michal Simek; Anirudha Sarangi;
> grant.likely@...aro.org; dan.j.williams@...el.com
> Subject: Re: [PATCH v4] dma: Add Xilinx AXI Direct Memory Access Engine
> driver support
>
> On Thu, Jan 29, 2015 at 11:24:41AM +0000, Appana Durga Kedareswara Rao
> wrote:
> > >  Earlier in the driver we are embedding dma_slave_config into custom
> > > structs But Lars suggested to modify it. please refer to the below
> > > thread for more details.
> > >  http://www.spinics.net/lists/dmaengine/msg00010.html
> > >
> > >  And later we thought of creating a separate private member in
> > > dma_slave_config for sharing additional configuration between slave
> > > device and dma engine Or a new dma_ctrl_cmd like
> > >
> FSLDMA_EXTERNAL_START(http://www.kernelhub.org/?msg=405535&p=2 )
> > >
> > >  Finally Vinod was ok with the existing suggestion so we dropped the
> > > above thought.
> > >
> > >  @Vinod : Could you please comment on this.
> FSLDMA_EXTERNAL_START has been removed, and you cna use the removal
> as a guidance of how to solve your issue
>

The current VDMA driver that got merged in the open source and the  current patch (dma: xilinx dma v4) Srikanth T submitted both contains the
Similar implementation that you pointed as above(I mean similar to the free scale dma driver).

The discussion starts here is why we need the header file(Xilinx_dma.h) in the include/linux/amba/Xilinx_dma.h  folder.

Like for FSL DMA it is got defined (fsl_dma_external_start) as a function prototype in include/linux/fsldma.h
And it is being getting used in the drivers/misc/carma/carma-fpga-program.c

Similarly in the Xilinx VDMA driver(xilinx_vdma_channel_set_config ) defined as a function prototype in the include/linux/amba/xilinx_dma.h
And is being used by Xilinx videos  drivers.
Those video driver need to use the (xilinx_vdma_channel_set_config) which requires this global header file.

Could you please suggest us whether that header file (Xilinx_dma.h) should be there  in include/linux/amba or we should move it to include/linux?
And any functional comments for this v4 patch?

Regards,
Kedar.

> Thanks
>
> --
> ~Vinod

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