linux-kernel - Re: [PATCH v4 09/11] dmaengine: dw: Initialize min

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Message-ID: <20200529105109.oswi2touyin5ir66@mobilestation>
Date:   Fri, 29 May 2020 13:51:09 +0300
From:   Serge Semin <Sergey.Semin@...kalelectronics.ru>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
CC:     Serge Semin <fancer.lancer@...il.com>,
        Vinod Koul <vkoul@...nel.org>,
        Viresh Kumar <vireshk@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Arnd Bergmann <arnd@...db.de>,
        Rob Herring <robh+dt@...nel.org>, <linux-mips@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <dmaengine@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 09/11] dmaengine: dw: Initialize min_burst capability

On Fri, May 29, 2020 at 01:50:09PM +0300, Andy Shevchenko wrote:
> On Fri, May 29, 2020 at 01:41:19PM +0300, Serge Semin wrote:
> > On Fri, May 29, 2020 at 01:29:02PM +0300, Andy Shevchenko wrote:
> > > On Fri, May 29, 2020 at 01:25:15PM +0300, Andy Shevchenko wrote:
> > > > On Fri, May 29, 2020 at 01:23:59AM +0300, Serge Semin wrote:
> 
> ...
> 
> > > > >  	/* DMA capabilities */
> > > > > +	dw->dma.min_burst = 1;
> > > > 
> > > > Perhaps then relaxed maximum, like
> > > > 
> > > > 	dw->dma.max_burst = 256;
> > > > 
> > > > (channels will update this)
> > > > 
> > > > ?
> > 
> > > And forgot to mention that perhaps we need a definitions for both.
> > 
> > By "definitions for both" do you mean a macro with corresponding parameter
> > definition like it's done for the max burst length in the next patch?
> > Something like this:
> > --- include/linux/platform_data/dma-dw.h
> > +++ include/linux/platform_data/dma-dw.h
> > +#define DW_DMA_MIN_BURST	1
> > +#define DW_DMA_MAX_BURST	256
> > 
> > ?
> 
> Yes!

Ok. Good idea. I'll do that. Thanks.

-Sergey

> 
> -- 
> With Best Regards,
> Andy Shevchenko
> 
>