Hi, On Fri, Feb 26, 2016 at 07:56:57AM +0200, Priit Laes wrote: > From: Michal Suchanek <hramrach@xxxxxxxxx> > > When testing SPI without DMA I noticed that filling the FIFO on the > spi controller causes timeout. This should never happen with DMA support > so just adding a comment. > > Signed-off-by: Michal Suchanek <hramrach@xxxxxxxxx> > --- > drivers/spi/spi-sun4i.c | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > > diff --git a/drivers/spi/spi-sun4i.c b/drivers/spi/spi-sun4i.c > index 78141a6..b750664 100644 > --- a/drivers/spi/spi-sun4i.c > +++ b/drivers/spi/spi-sun4i.c > @@ -333,7 +333,9 @@ static int sun4i_spi_transfer_one(struct spi_master *master, > sun4i_spi_write(sspi, SUN4I_DMA_CTL_REG, 0); > > /* Fill the TX FIFO */ > - sun4i_spi_fill_fifo(sspi, SUN4I_FIFO_DEPTH); > + /* Filling the fifo fully causes timeout for some reason - at least on spi2 on a10s */ > + /* The can_dma check is txlen >= SUN4I_FIFO_DEPTH so with DMA this should never happen anyway. */ > + sun4i_spi_fill_fifo(sspi, SUN4I_FIFO_DEPTH - 1); Please wrap the lines at 80 chars and use the proper multiline comment style. Thanks! Maxime -- Maxime Ripard, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com
Attachment:
signature.asc
Description: Digital signature
