linux-kernel - Re: [PATCH 7/7] dw_dmac: introduce software emulation of LLP transfers

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Date:	Thu, 20 Sep 2012 12:46:36 +0300
From:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:	viresh kumar <viresh.kumar@...aro.org>
Cc:	Vinod Koul <vinod.koul@...el.com>, spear-devel@...t.st.com,
	linux-kernel@...r.kernel.org, Hein Tibosch <hein_tibosch@...oo.es>
Subject: Re: [PATCH 7/7] dw_dmac: introduce software emulation of LLP
 transfers

On Tue, 2012-09-18 at 12:47 +0530, viresh kumar wrote: 
> On Mon, Sep 17, 2012 at 1:09 PM, Andy Shevchenko
> <andriy.shevchenko@...ux.intel.com> wrote:
> > @@ -555,8 +594,36 @@ static void dw_dma_tasklet(unsigned long data)
> >                         dwc_handle_cyclic(dw, dwc, status_err, status_xfer);
> >                 else if (status_err & (1 << i))
> >                         dwc_handle_error(dw, dwc);
> > -               else if (status_xfer & (1 << i))
> > +               else if (status_xfer & (1 << i)) {
> > +                       unsigned long flags;
> > +
> > +                       spin_lock_irqsave(&dwc->lock, flags);
> > +                       if (test_bit(DW_DMA_IS_SOFT_LLP, &dwc->flags)) {
> > +                               if (dwc->tx_node_active != dwc->tx_list) {
> > +                                       struct dw_desc *desc =
> > +                                               list_entry(dwc->tx_node_active,
> > +                                                          struct dw_desc,
> > +                                                          desc_node);
> 
> can come in single line.
Depends on checkpatch.pl. Anyway I'll try to squeeze it.

> > @@ -647,12 +714,6 @@ dwc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
> >         unsigned int            dst_width;
> >         u32                     ctllo;
> >
> > -       if (dwc->nollp) {
> > -               dev_dbg(chan2dev(&dwc->chan),
> > -                               "channel doesn't support LLP transfers\n");
> > -               return NULL;
> > -       }
> > -
> 
> :)
> You should actually merge 6/7 with 7/7... You can't revert something
> in the same patchset.
Ok. It was done just in regard to have a bisectability working.


-- 
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Intel Finland Oy
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