linux-kernel - Re: [PATCH 0/7] dw_dmac: introduce autoconfiguration

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Message-ID: <1348134509.13371.44.camel@smile>
Date:	Thu, 20 Sep 2012 12:48:29 +0300
From:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:	Hein Tibosch <hein_tibosch@...oo.es>
Cc:	Viresh Kumar <viresh.linux@...il.com>,
	Vinod Koul <vinod.koul@...el.com>, spear-devel@...t.st.com,
	linux-kernel@...r.kernel.org,
	"ludovic.desroches" <ludovic.desroches@...el.com>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Hans-Christian Egtvedt <egtvedt@...fundet.no>
Subject: Re: [PATCH 0/7] dw_dmac: introduce autoconfiguration

On Tue, 2012-09-18 at 14:11 +0800, Hein Tibosch wrote: 
> On 9/17/2012 3:39 PM, Andy Shevchenko wrote:
> > Here is a patchset that allows to adapt the driver to the hardware
> > configuration during probe time. The hardware should have the specific optional
> > parameters enabled. Otherwise the driver will consider values stored in the
> > platform data.
> >
> > Additionally it brings support of the software LLP transfers. It means that
> > normal linked list transfer is substituted by set of single block transfers
> > transparently to the user.
> >
> > Comments are welcome.
> >
> > Andy Shevchenko (7):
> >   dw_dmac: mark dwc_dump_chan_regs as inline
> >   dw_dmac: fill optional encoded parameters in register structure
> >   dw_dmac: get number of channels from hardware if possible
> >   dw_dmac: autoconfigure block_size or use platform data
> >   dw_dmac: autoconfigure data_width or get it via platform data
> >   dw_dmac: check if controller supports LLP
> >   dw_dmac: introduce software emulation of LLP transfers
> >
> >  arch/arm/mach-spear13xx/spear13xx.c |    3 +
> >  arch/avr32/mach-at32ap/at32ap700x.c |    3 +
> >  drivers/dma/dw_dmac.c               |  207 +++++++++++++++++++++++++++++------
> >  drivers/dma/dw_dmac_regs.h          |   48 ++++++++
> >  include/linux/dw_dmac.h             |    7 ++
> >  5 files changed, 235 insertions(+), 33 deletions(-)
> Andy,
> 
> The (embedded) dw dma on the AP7000 indeed does not support auto
> configuration (the register reads as zero)
Nice to have the test report. I have no devices around without auto
configuration block.

> and so it needs the platform data.
> 
> I tested the driver on AVR32 with the atmel-mci driver and it all
> worked well.

> I also tested the new software emulation of LLP mode by setting
> nollp for each channel to true. That also worked as expected.

Thanks!

> Tested-by: Hein Tibosch <hein_tibosch@...oo.es>

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