[PATCH 3/6] spi: bcm2835: fill FIFO before enabling interrupts to

Mark Brown broonie at kernel.org
Tue Apr 7 11:23:27 PDT 2015

On Tue, Apr 07, 2015 at 08:18:57PM +0200, Martin Sperl wrote:
> > On 07.04.2015, at 19:40, Mark Brown <broonie at kernel.org> wrote:

> > For your workload perhaps.  For some workloads they are very common
> > (register reads are the most obvious example, they are typically a write
> > transfer to provide the register address followed by a read transfer for
> > the data).

> Which spi_write_then_read collapses into a single transfer.

No it doesn't.  It creates a single message with two transfers (which is
what I'd expect any user doing this to do, there are others that don't
use the SPI helper APIs).
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