Re: [PATCH v1 0/2] spi: dw-mid: fix simplex DMA transfers

[Andy Shevchenko <andriy.shevchenko-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>]

On Tue, 2014-10-28 at 22:41 +0000, Mark Brown wrote:
> On Tue, Oct 28, 2014 at 06:25:00PM +0200, Andy Shevchenko wrote:
> > In current shape the driver relies on both TX and RX transfers when DMA is
> > enabled. In case of simplex transfer the driver will stuck, since call back
> > function will never achieve the proper condition to finish the transfer.
> 
> Applied both, thanks.

Thanks!

>   Can you please also send a patch for Linus
> setting SPI_MASTER_MUST_RX and SPI_MASTER_MUST_TX - this is a bug which
> should be fixed in mainline but these seem a bit big for merge right
> now, those flags will cause the core to always ensure that both
> directions have data avoiding the issue?

I'm sorry I didn't quite understand that bug.

When those bits are set the core will always provide valid tx_buf and
rx_buf pointers. How would it help us? Currently driver relies on tx_dma
and rx_dma which are provided by clients if I understood correctly.

-- 
Andy Shevchenko <andriy.shevchenko-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Intel Finland Oy

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