On Tue, Dec 01, 2015 at 11:14:58AM +0200, Stanimir Varbanov wrote: > The pipe fifo size register must instruct the bam hw > how many hw descriptors can be pushed to fifo. Currently > we isntruct the hw with 32KBytes but wrap the tail in > bam_start_dma in BAM_P_EVNT_REG on 4095 i.e. 32760. This > leads to stalled transactions when the tail wraps. > > Fix this by use the correct fifo size in BAM_P_FIFO_SIZES > register i.e. 32K - 8. > > Signed-off-by: Stanimir Varbanov <stanimir.varbanov@xxxxxxxxxx> > --- > drivers/dma/qcom_bam_dma.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/dma/qcom_bam_dma.c b/drivers/dma/qcom_bam_dma.c > index 0f06f3b7a72b..6d290de9ab2b 100644 > --- a/drivers/dma/qcom_bam_dma.c > +++ b/drivers/dma/qcom_bam_dma.c > @@ -458,7 +458,7 @@ static void bam_chan_init_hw(struct bam_chan *bchan, > */ > writel_relaxed(ALIGN(bchan->fifo_phys, sizeof(struct bam_desc_hw)), > bam_addr(bdev, bchan->id, BAM_P_DESC_FIFO_ADDR)); > - writel_relaxed(BAM_DESC_FIFO_SIZE, > + writel_relaxed(BAM_MAX_DATA_SIZE, > bam_addr(bdev, bchan->id, BAM_P_FIFO_SIZES)); This is just using the #define. That is ok, but if you use this instead of the BAM_P_FIFO_SIZES then you need to fix your comment. Or actually use the register value.... otherwise looks fine. -- To unsubscribe from this list: send the line "unsubscribe dmaengine" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
