Hello. On 13-03-2011 17:34, Michael Williamson wrote:
> The current davinci SPI driver, in DMA mode, is limited to 65535 > words for a single transfer. Modify the driver by configuring a > 3 dimensional EDMA transfer to support up to 65535x65535 > words. > Signed-off-by: Michael Williamson<[email protected]> [...] > diff --git a/drivers/spi/davinci_spi.c b/drivers/spi/davinci_spi.c > index 037ba82..411cc32 100644 > --- a/drivers/spi/davinci_spi.c > +++ b/drivers/spi/davinci_spi.c [...] > @@ -599,14 +600,30 @@ static int davinci_spi_bufs(struct spi_device *spi, > struct spi_transfer *t) > } > } > > + /* > + * If number of words is greater than 65535, then we need > + * to configure a 3 dimension transfer. Use the BCNTRLD > + * feature to allow for transfers that aren't even multiples > + * of 65535 (or any other possible b size) by first transferring > + * the remainder amount then grabbing the next N blocks of > + * 65535 words. > + */ > + > + c = dspi->wcount/(SZ_64K-1); /* N 65535 count Blocks */ > + b = dspi->wcount-c*(SZ_64K-1); /* Remainder */ The driver style (and general Linux kernel style) assumes spaces around operators. WRB, Sergei ------------------------------------------------------------------------------ Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d _______________________________________________ spi-devel-general mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/spi-devel-general
