dmaengine: qcom: bam_dma: use correct pipe FIFO size

The pipe fifo size register must instruct the bam hw
how many hw descriptors can be pushed to fifo. Currently
we instruct 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@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

diff --git a/drivers/dma/qcom/bam_dma.c b/drivers/dma/qcom/bam_dma.c
index d0f878a78fae5235289b5b4eb64f0ed19f6da4f3..7e5ad1c25e21f349da5373b6a322b8c1adf3d632 100644 (file)
--- a/drivers/dma/qcom/bam_dma.c
+++ b/drivers/dma/qcom/bam_dma.c
@@ -459,7 +459,7 @@ 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));
 
        /* enable the per pipe interrupts, enable EOT, ERR, and INT irqs */