On Tue, 28 Jan 2014 23:40:41 +0400
Dmitry Eremin-Solenikov <[email protected]> wrote:
> Never ever put spi transfer buffer onto the stack. It is not dma safe.
> Use kmalloc/kzalloc.
Noted. The GFP_DMA flag just confused for a few minutes, but looking at
some DMA Documentation, apparently all kmalloc() memory is safe. Good
to know. :)
> > +{
> > + int rc;
> > +
> > + if (channel == 0) {
>
> if (page == 0) ?
Actually, no. According to datasheet page 97, channel 0 has
bit 2 of the register, which is SR_SUB_MODE, set to 0, while for the
others it'll be one. There's also a 100% bitrate increase when you go
from channel 0 to channels 1 through 10. The page influences the next
higher bit in the register, bit 3, which is the BPSK_QPSK switch.
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