linux-kernel - Re: [PATCH v4 2/7] dmaengine: xilinx_dma: in axidma slave_sg and dma

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Date:   Thu, 30 Aug 2018 18:57:45 +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-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 v4 2/7] dmaengine: xilinx_dma: in axidma slave_sg and
 dma_cylic mode align split descriptors

On 30-08-18, 10:11, Andrea Merello wrote:
> On Wed, Aug 29, 2018 at 10:12 AM Andrea Merello
> <andrea.merello@...il.com> wrote:
> >
> > On Mon, Aug 27, 2018 at 7:30 AM Vinod <vkoul@...nel.org> wrote:
> > >
> > > On 02-08-18, 16:10, Andrea Merello wrote:
> > >
> > > s/cylic/cyclic in patch title
> >
> > OK
> >
> > > > Whenever a single or cyclic transaction is prepared, the driver
> > > > could eventually split it over several SG descriptors in order
> > > > to deal with the HW maximum transfer length.
> > > >
> > > > This could end up in DMA operations starting from a misaligned
> > > > address. This seems fatal for the HW if DRE is not enabled.
> > >
> > > DRE?
> >
> > Stands for "Data Realignment Engine". I will add this string nearby
> > the acronym..
> >
> > > >
> > > > This patch eventually adjusts the transfer size in order to make sure
> > > > all operations start from an aligned address.
> > > >
> > > > Cc: Radhey Shyam Pandey <radhey.shyam.pandey@...inx.com>
> > > > Signed-off-by: Andrea Merello <andrea.merello@...il.com>
> > > > Reviewed-by: Radhey Shyam Pandey <radhey.shyam.pandey@...inx.com>
> > > > ---
> > > > Changes in v2:
> > > >         - don't introduce copy_mask field, rather rely on already-esistent
> > > >           copy_align field. Suggested by Radhey Shyam Pandey
> > > >         - reword title
> > > > Changes in v3:
> > > >       - fix bug introduced in v2: wrong copy size when DRE is enabled
> > > >       - use implementation suggested by Radhey Shyam Pandey
> > > > Changes in v4:
> > > >       - rework on the top of 1/6
> > > > ---
> > > >  drivers/dma/xilinx/xilinx_dma.c | 22 ++++++++++++++++++----
> > > >  1 file changed, 18 insertions(+), 4 deletions(-)
> > > >
> > > > diff --git a/drivers/dma/xilinx/xilinx_dma.c b/drivers/dma/xilinx/xilinx_dma.c
> > > > index a3aaa0e34cc7..aaa6de8a70e4 100644
> > > > --- a/drivers/dma/xilinx/xilinx_dma.c
> > > > +++ b/drivers/dma/xilinx/xilinx_dma.c
> > > > @@ -954,15 +954,28 @@ static int xilinx_dma_alloc_chan_resources(struct dma_chan *dchan)
> > > >
> > > >  /**
> > > >   * xilinx_dma_calc_copysize - Calculate the amount of data to copy
> > > > + * @chan: Driver specific DMA channel
> > > >   * @size: Total data that needs to be copied
> > > >   * @done: Amount of data that has been already copied
> > > >   *
> > > >   * Return: Amount of data that has to be copied
> > > >   */
> > > > -static int xilinx_dma_calc_copysize(int size, int done)
> > > > +static int xilinx_dma_calc_copysize(struct xilinx_dma_chan *chan,
> > > > +                                 int size, int done)
> > >
> > > please align with opening brace
> >
> > OK
> 
> Sorry for getting back on this.
> I've checked it, but it seems already aligned with opening brace in
> the original e-mail text I've sent. (4 tabs + 4 spaces).

Okay, please see that code looks fine, I will check after I apply

-- 
~Vinod