Messages in this thread | | | Date | Mon, 15 Jun 2020 15:36:22 +0100 | From | Mark Brown <> | Subject | Re: [PATCH v1 RFC 1/2] spi: introduce fallback to pio |
| |
On Mon, Jun 15, 2020 at 02:18:54PM +0000, Robin Gong wrote: > On 2020/06/15 21:39 Mark Brown <broonie@kernel.org> wrote: > > On Mon, Jun 15, 2020 at 01:35:01PM +0000, Robin Gong wrote:
> > > Then how about choosing specific error code for such dma not ready > > > case where nothing went out on the bus neither?
> > Yes, that's what I suggested.
> Seems not easy to find a suitable error value, how about EBADR which > sounds like no any available dma_async_tx_descriptor got by calling dmaengine_prep_slave_sg?
> #define EBADR 53 /* Invalid request descriptor */
We could also pass in a flag that could be set separately to the error code to indicate that nothing had happened to the hardware yet. [unhandled content-type:application/pgp-signature] | |