linux-kernel - Re: [PATCH v5 4/7] dmaengine: xilinx_dma: program hardware supported buffer length

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Message-ID: <20181002145647.GG19792@vkoul-mobl>
Date:   Tue, 2 Oct 2018 20:26:47 +0530
From:   Vinod <vkoul@...nel.org>
To:     Andrea Merello <andrea.merello@...il.com>
Cc:     dan.j.williams@...el.com, michal.simek@...inx.com,
        appana.durga.rao@...inx.com, dmaengine@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        devicetree <devicetree@...r.kernel.org>,
        Radhey Shyam Pandey <radhey.shyam.pandey@...inx.com>
Subject: Re: [PATCH v5 4/7] dmaengine: xilinx_dma: program hardware supported
 buffer length

On 28-09-18, 08:53, Andrea Merello wrote:
> On Tue, Sep 18, 2018 at 6:25 PM Vinod <vkoul@...nel.org> wrote:

> > > @@ -964,7 +968,7 @@ static int xilinx_dma_calc_copysize(struct xilinx_dma_chan *chan,
> > >                                   int size, int done)
> > >  {
> > >       size_t copy = min_t(size_t, size - done,
> > > -                  XILINX_DMA_MAX_TRANS_LEN);
> > > +                         chan->xdev->max_buffer_len);
> >
> > hmm why not add max_buffer_len in patch 1 again, and then use default
> > len as XILINX_DMA_MAX_TRANS_LEN and add multiple lengths here :)
> 
> Sorry, I'm not getting your point. Could you please elaborate the "add
> multiple lengths here" thing ?

IIRC (sorry been travelling and vacation), add
chan->xdev->max_buffer_len in patch 1 and initialize it to
XILINX_DMA_MAX_TRANS_LEN. Then in subsequent patches update the length.

-- 
~Vinod