linux-kernel - Re: [PATCH v5 34/61] dmaengine: omap: Split device

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Message-ID: <20141205145642.GI3411@intel.com>
Date:	Fri, 5 Dec 2014 20:26:42 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:	dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Antoine Ténart <antoine@...e-electrons.com>,
	Russell King <linux@....linux.org.uk>, lars@...afoo.de
Subject: Re: [PATCH v5 34/61] dmaengine: omap: Split device_control

On Fri, Dec 05, 2014 at 03:33:59PM +0100, Maxime Ripard wrote:
> Hi Vinod,
> 
> On Fri, Dec 05, 2014 at 07:57:02PM +0530, Vinod Koul wrote:
> > On Mon, Nov 17, 2014 at 02:42:28PM +0100, Maxime Ripard wrote:
> > > Split the device_control callback of the TI OMAP DMA driver to make use
> > > of the newly introduced callbacks, that will eventually be used to retrieve
> > > slave capabilities.
> > > 
> > > Signed-off-by: Maxime Ripard <maxime.ripard@...e-electrons.com>
> > > ---
> > >  drivers/dma/omap-dma.c | 51 +++++++++++++++-----------------------------------
> > >  1 file changed, 15 insertions(+), 36 deletions(-)
> > > 
> > > diff --git a/drivers/dma/omap-dma.c b/drivers/dma/omap-dma.c
> > > index a8aa5b6bb5e2..1cadf812f3b3 100644
> > > --- a/drivers/dma/omap-dma.c
> > > +++ b/drivers/dma/omap-dma.c
> > > @@ -948,8 +948,10 @@ static struct dma_async_tx_descriptor *omap_dma_prep_dma_cyclic(
> > >  	return vchan_tx_prep(&c->vc, &d->vd, flags);
> > >  }
> > >  
> > > -static int omap_dma_slave_config(struct omap_chan *c, struct dma_slave_config *cfg)
> > > +static int omap_dma_slave_config(struct dma_chan *chan, struct dma_slave_config *cfg)
> > >  {
> > > +	struct omap_chan *c = to_omap_dma_chan(chan);
> > > +
> > >  	if (cfg->src_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES ||
> > >  	    cfg->dst_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES)
> > >  		return -EINVAL;
> > > @@ -959,8 +961,9 @@ static int omap_dma_slave_config(struct omap_chan *c, struct dma_slave_config *c
> > >  	return 0;
> > >  }
> > >  
> > > -static int omap_dma_terminate_all(struct omap_chan *c)
> > > +static int omap_dma_terminate_all(struct dma_chan *chan)
> > >  {
> > > +	struct omap_chan *c = to_omap_dma_chan(chan);
> > >  	struct omap_dmadev *d = to_omap_dma_dev(c->vc.chan.device);
> > >  	unsigned long flags;
> > >  	LIST_HEAD(head);
> > > @@ -996,8 +999,10 @@ static int omap_dma_terminate_all(struct omap_chan *c)
> > >  	return 0;
> > >  }
> > >  
> > > -static int omap_dma_pause(struct omap_chan *c)
> > > +static int omap_dma_pause(struct dma_chan *chan)
> > >  {
> > > +	struct omap_chan *c = to_omap_dma_chan(chan);
> > > +
> > >  	/* Pause/Resume only allowed with cyclic mode */
> > >  	if (!c->cyclic)
> > >  		return -EINVAL;
> > > @@ -1010,8 +1015,10 @@ static int omap_dma_pause(struct omap_chan *c)
> > >  	return 0;
> > >  }
> > >  
> > > -static int omap_dma_resume(struct omap_chan *c)
> > > +static int omap_dma_resume(struct dma_chan *chan)
> > >  {
> > > +	struct omap_chan *c = to_omap_dma_chan(chan);
> > > +
> > >  	/* Pause/Resume only allowed with cyclic mode */
> > >  	if (!c->cyclic)
> > >  		return -EINVAL;
> > > @@ -1029,37 +1036,6 @@ static int omap_dma_resume(struct omap_chan *c)
> > >  	return 0;
> > >  }
> > >  
> > > -static int omap_dma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
> > > -	unsigned long arg)
> > > -{
> > > -	struct omap_chan *c = to_omap_dma_chan(chan);
> > > -	int ret;
> > > -
> > > -	switch (cmd) {
> > > -	case DMA_SLAVE_CONFIG:
> > > -		ret = omap_dma_slave_config(c, (struct dma_slave_config *)arg);
> > > -		break;
> > > -
> > > -	case DMA_TERMINATE_ALL:
> > > -		ret = omap_dma_terminate_all(c);
> > > -		break;
> > > -
> > > -	case DMA_PAUSE:
> > > -		ret = omap_dma_pause(c);
> > > -		break;
> > > -
> > > -	case DMA_RESUME:
> > > -		ret = omap_dma_resume(c);
> > > -		break;
> > > -
> > > -	default:
> > > -		ret = -ENXIO;
> > > -		break;
> > > -	}
> > > -
> > > -	return ret;
> > > -}
> > > -
> > >  static int omap_dma_chan_init(struct omap_dmadev *od, int dma_sig)
> > >  {
> > >  	struct omap_chan *c;
> > > @@ -1136,7 +1112,10 @@ static int omap_dma_probe(struct platform_device *pdev)
> > >  	od->ddev.device_issue_pending = omap_dma_issue_pending;
> > >  	od->ddev.device_prep_slave_sg = omap_dma_prep_slave_sg;
> > >  	od->ddev.device_prep_dma_cyclic = omap_dma_prep_dma_cyclic;
> > > -	od->ddev.device_control = omap_dma_control;
> > this should be assigned to omap_dma_slave_config. omap_dma_control is not
> > here :(
> 
> I'm not sure what you mean here. I'm removing this line, together with
> the whole omap_dma_control function.
Sorry wrong quote and not good explanations. the lines i quoted is
wrong one... 

-       od->ddev.device_control = omap_dma_control;
+       od->ddev.device_config = omap_dma_config;
this is troubling line here...

we dont have omap_dma_config. It should be omap_dma_slave_config instead

-- 
~Vinod

+       od->ddev.device_pause = omap_dma_pause;
+       od->ddev.device_resume = omap_dma_resume;
+       od->ddev.device_terminate_all = omap_dma_terminate_all;

> 
> Maxime
> 
> -- 
> Maxime Ripard, Free Electrons
> Embedded Linux, Kernel and Android engineering
> http://free-electrons.com



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