linux-kernel - Re: [RFC v02 04/15] dmaengine: edma: Add support for DMA filter mapping to slave devices

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Date:	Tue, 1 Dec 2015 11:58:53 +0200
From:	Peter Ujfalusi <peter.ujfalusi@...com>
To:	Arnd Bergmann <arnd@...db.de>
CC:	<vinod.koul@...el.com>, <andy.shevchenko@...il.com>,
	<linux-kernel@...r.kernel.org>, <dmaengine@...r.kernel.org>,
	<linux-omap@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-mmc@...r.kernel.org>, <nsekhar@...com>,
	<linux-spi@...r.kernel.org>
Subject: Re: [RFC v02 04/15] dmaengine: edma: Add support for DMA filter
 mapping to slave devices

On 11/30/2015 04:11 PM, Arnd Bergmann wrote:
> On Monday 30 November 2015 15:45:34 Peter Ujfalusi wrote:
>> @@ -2428,6 +2436,22 @@ bool edma_filter_fn(struct dma_chan *chan, void *param)
>>  }
>>  EXPORT_SYMBOL(edma_filter_fn);
>>  
>> +static bool edma_filter_for_map(struct dma_chan *chan, void *param)
>> +{
>> +       bool match = false;
>> +
>> +       if (chan->device->dev->driver == &edma_driver.driver) {
>> +               struct edma_chan *echan = to_edma_chan(chan);
>> +               unsigned ch_req = (unsigned)param;
>> +               if (ch_req == echan->ch_num) {
>> +                       /* The channel is going to be used as HW synchronized */
>> +                       echan->hw_triggered = true;
>> +                       match = true;
>> +               }
>> +       }
>> +       return match;
>> +}
>> +
>>  static int edma_init(void)
>>
> 
> I don't see the difference between edma_filter_fn and edma_filter_for_map.
> Why do you need both?

edma_filter_fn:
	unsigned ch_req = *(unsigned *)param;

edma_filter_for_map:
	unsigned ch_req = (unsigned)param;


If I want to reuse the edma_filter_fn, I would need an unsigned array for the
eDMA event numbers in the board files to be able to provide the pointer to
each of them.

-- 
Péter
--
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