On Wed, 2014-09-24 at 09:44 +0100, Mark Brown wrote: > On Thu, Sep 18, 2014 at 08:08:52PM +0300, Andy Shevchenko wrote: > > In case of DMA we never got things done until we enable both channels. In case > > of receive only or send only mode the user has to provide a dummy buffer. > > The driver must never impose such requirements on clients, they > shouldn't need to know about the quirks of the controller. There's > support in the core providing dummy buffers for transmit and receive, > you should use that (possibly extending it so the dummies are only > provided for DMA). Currently driver in case of receiving or sending only will never call the xfer_done from DMA callback since we never will have counter equal to 2. So, the driver already relies on duplex mode. Am I missing something? -- Andy Shevchenko <andriy.shevchenko@xxxxxxxxx> Intel Finland Oy -- To unsubscribe from this list: send the line "unsubscribe dmaengine" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
