The original cause seems to be in spi driver. I tested setting enable_dma flag to false in spi-pxa2xx driver and that fixes the problem. Will investigate in spi driver side. Thanks! Hsin-yu On Mon, Jul 24, 2017 at 11:06 AM, Oder Chiou <oder_chiou@xxxxxxxxxxx> wrote: > > On Fri, Jul 21, 2017 at 04:00:47PM +0800, Oder Chiou wrote: > > > The patch uses the local variable to get the data from SPI device to > > > prevent to get all zero data. > > > > How do you end up with all zero data from reading directly into rxbuf? > > > While the "runtime->dma_area" put into the rxbuf directly on the Intel > platform, it seemed that had the limitation to let the memory cannot be > written the data using the driver of the SPI controller. We verified the > original code on the platforms of Nvidia and Rockchip, and these are > working fine. > _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
