diff options
Diffstat (limited to 'drivers/dma/imx-dma.c')
| -rw-r--r-- | drivers/dma/imx-dma.c | 42 |
1 files changed, 18 insertions, 24 deletions
diff --git a/drivers/dma/imx-dma.c b/drivers/dma/imx-dma.c index 484f3536590..82d4099bd8f 100644 --- a/drivers/dma/imx-dma.c +++ b/drivers/dma/imx-dma.c @@ -129,7 +129,6 @@ enum imxdma_prep_type { */ struct imxdma_channel_internal { - struct scatterlist *sg; unsigned int resbytes; int in_use; @@ -278,11 +277,11 @@ static void imxdma_enable_hw(struct imxdma_desc *d) CCR_ACRPT, DMA_CCR(channel)); if ((cpu_is_mx21() || cpu_is_mx27()) && - imxdmac->internal.sg && imxdma_hw_chain(&imxdmac->internal)) { - imxdmac->internal.sg = sg_next(imxdmac->internal.sg); - if (imxdmac->internal.sg) { + d->sg && imxdma_hw_chain(&imxdmac->internal)) { + d->sg = sg_next(d->sg); + if (d->sg) { u32 tmp; - imxdma_sg_next(d, imxdmac->internal.sg); + imxdma_sg_next(d, d->sg); tmp = imx_dmav1_readl(DMA_CCR(channel)); imx_dmav1_writel(tmp | CCR_RPT | CCR_ACRPT, DMA_CCR(channel)); @@ -319,7 +318,6 @@ static void imxdma_watchdog(unsigned long data) imx_dmav1_writel(0, DMA_CCR(channel)); imxdmac->internal.in_use = 0; - imxdmac->internal.sg = NULL; /* Tasklet watchdog error handler */ tasklet_schedule(&imxdmac->dma_tasklet); @@ -387,24 +385,23 @@ static void dma_irq_handle_channel(struct imxdma_channel *imxdmac) int chno = imxdmac->channel; struct imxdma_desc *desc; - if (imxdma->sg) { - u32 tmp; - imxdma->sg = sg_next(imxdma->sg); - - if (imxdma->sg) { + spin_lock(&imxdmac->lock); + if (list_empty(&imxdmac->ld_active)) { + spin_unlock(&imxdmac->lock); + goto out; + } - spin_lock(&imxdmac->lock); - if (list_empty(&imxdmac->ld_active)) { - spin_unlock(&imxdmac->lock); - goto out; - } + desc = list_first_entry(&imxdmac->ld_active, + struct imxdma_desc, + node); + spin_unlock(&imxdmac->lock); - desc = list_first_entry(&imxdmac->ld_active, - struct imxdma_desc, - node); - spin_unlock(&imxdmac->lock); + if (desc->sg) { + u32 tmp; + desc->sg = sg_next(desc->sg); - imxdma_sg_next(desc, imxdma->sg); + if (desc->sg) { + imxdma_sg_next(desc, desc->sg); tmp = imx_dmav1_readl(DMA_CCR(chno)); @@ -477,8 +474,6 @@ static int imxdma_xfer_desc(struct imxdma_desc *d) /* Configure and enable */ switch (d->type) { case IMXDMA_DESC_MEMCPY: - imxdmac->internal.sg = NULL; - imx_dmav1_writel(d->src, DMA_SAR(imxdmac->channel)); imx_dmav1_writel(d->dest, DMA_DAR(imxdmac->channel)); imx_dmav1_writel(d->config_mem | (d->config_port << 2), @@ -494,7 +489,6 @@ static int imxdma_xfer_desc(struct imxdma_desc *d) /* Cyclic transfer is the same as slave_sg with special sg configuration. */ case IMXDMA_DESC_CYCLIC: case IMXDMA_DESC_SLAVE_SG: - imxdmac->internal.sg = d->sg; imxdmac->internal.resbytes = d->len; if (d->direction == DMA_DEV_TO_MEM) { |