From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: viresh kumar <viresh.kumar@linaro.org>
Cc: Vinod Koul <vinod.koul@intel.com>,
spear-devel@list.st.com, linux-kernel@vger.kernel.org,
Hein Tibosch <hein_tibosch@yahoo.es>
Subject: Re: [PATCH 6/7] dw_dmac: check if controller supports LLP
Date: Thu, 20 Sep 2012 12:43:26 +0300 [thread overview]
Message-ID: <1348134206.13371.40.camel@smile> (raw)
In-Reply-To: <CAOh2x=mav-8hkKEpOw0H5vQ=uPx+7sxBPsa_eDpTpEqgXuzXSQ@mail.gmail.com>
On Tue, 2012-09-18 at 12:43 +0530, viresh kumar wrote:
> On Mon, Sep 17, 2012 at 1:09 PM, Andy Shevchenko
> <andriy.shevchenko@linux.intel.com> wrote:
> > Some controllers have the reduced functionality where the LLP multi block
> > transfers are not supported. This patch introduces a check and refuses to deal
> > with such devices.
> >
> > Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> > ---
> > drivers/dma/dw_dmac.c | 35 ++++++++++++++++++++++++++++++++++-
> > drivers/dma/dw_dmac_regs.h | 4 ++++
> > 2 files changed, 38 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c
> > index fdb7d5a..00958ad 100644
> > --- a/drivers/dma/dw_dmac.c
> > +++ b/drivers/dma/dw_dmac.c
> > @@ -647,6 +647,12 @@ 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;
> > + }
>
> But this could have been a single block request. Isn't it?
I think we could discard this comment in regard to comments on next
patch.
--
Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Intel Finland Oy
next prev parent reply other threads:[~2012-09-20 9:47 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-17 7:39 [PATCH 0/7] dw_dmac: introduce autoconfiguration Andy Shevchenko
2012-09-17 7:39 ` [PATCH 1/7] dw_dmac: mark dwc_dump_chan_regs as inline Andy Shevchenko
2012-09-18 6:35 ` viresh kumar
2012-09-17 7:39 ` [PATCH 2/7] dw_dmac: fill optional encoded parameters in register structure Andy Shevchenko
2012-09-18 6:39 ` viresh kumar
2012-09-18 6:55 ` Andy Shevchenko
2012-09-18 7:59 ` viresh kumar
2012-09-20 9:30 ` Andy Shevchenko
2012-09-20 9:32 ` viresh kumar
2012-09-20 9:51 ` Andy Shevchenko
2012-09-17 7:39 ` [PATCH 3/7] dw_dmac: get number of channels from hardware if possible Andy Shevchenko
2012-09-18 6:50 ` viresh kumar
2012-09-20 9:35 ` Andy Shevchenko
2012-09-20 9:40 ` viresh kumar
2012-09-21 6:04 ` viresh kumar
2012-09-17 7:39 ` [PATCH 4/7] dw_dmac: autoconfigure block_size or use platform data Andy Shevchenko
2012-09-18 6:57 ` viresh kumar
2012-09-20 9:38 ` Andy Shevchenko
2012-09-17 7:39 ` [PATCH 5/7] dw_dmac: autoconfigure data_width or get it via " Andy Shevchenko
2012-09-18 7:11 ` viresh kumar
2012-09-20 9:42 ` Andy Shevchenko
2012-09-20 9:46 ` viresh kumar
2012-09-20 9:53 ` Andy Shevchenko
2012-09-17 7:39 ` [PATCH 6/7] dw_dmac: check if controller supports LLP Andy Shevchenko
2012-09-18 7:13 ` viresh kumar
2012-09-20 9:43 ` Andy Shevchenko [this message]
2012-09-17 7:39 ` [PATCH 7/7] dw_dmac: introduce software emulation of LLP transfers Andy Shevchenko
2012-09-18 7:17 ` viresh kumar
2012-09-20 9:46 ` Andy Shevchenko
2012-09-17 16:50 ` [PATCH 0/7] dw_dmac: introduce autoconfiguration Hein Tibosch
2012-09-18 6:11 ` Hein Tibosch
2012-09-18 7:18 ` viresh kumar
2012-09-20 9:48 ` Andy Shevchenko
2012-09-21 12:05 ` [PATCHv2 0/6] " Andy Shevchenko
2012-09-21 12:05 ` [PATCHv2 1/6] dw_dmac: mark dwc_dump_chan_regs as inline Andy Shevchenko
2012-09-21 12:05 ` [PATCHv2 2/6] dw_dmac: fill optional encoded parameters in register structure Andy Shevchenko
2012-09-21 13:55 ` viresh kumar
2012-09-21 12:05 ` [PATCHv2 3/6] dw_dmac: get number of channels from hardware if possible Andy Shevchenko
2012-09-21 13:56 ` viresh kumar
2012-09-21 12:05 ` [PATCHv2 4/6] dw_dmac: autoconfigure block_size or use platform data Andy Shevchenko
2012-09-21 14:00 ` viresh kumar
2012-09-21 15:09 ` Andy Shevchenko
2012-09-21 15:30 ` Viresh Kumar
2012-09-21 12:05 ` [PATCHv2 5/6] dw_dmac: autoconfigure data_width or get it via " Andy Shevchenko
2012-09-21 14:02 ` viresh kumar
2012-09-25 11:39 ` [PATCHv3] " Andy Shevchenko
2012-09-26 3:29 ` viresh kumar
2012-09-27 10:06 ` Vinod Koul
2012-09-27 10:33 ` Vinod Koul
2012-09-27 13:10 ` Andy Shevchenko
2012-10-01 9:04 ` Andy Shevchenko
2012-10-01 9:45 ` Vinod Koul
2012-10-01 10:07 ` Andy Shevchenko
2012-09-27 14:00 ` Andy Shevchenko
2012-09-27 14:27 ` Vinod Koul
2012-09-21 12:05 ` [PATCHv2 6/6] dw_dmac: introduce software emulation of LLP transfers Andy Shevchenko
2012-09-21 14:03 ` viresh kumar
2012-09-27 10:05 ` [PATCHv2 0/6] dw_dmac: introduce autoconfiguration Vinod Koul
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