dw_dmac: disable dma in optimal way in probe

The dw_dma_off call needs to have the all_chan_mask calculated. So, done this
calculations before the call. Moreover, remove duplicate code that masks the
DMA interrupts.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Viresh Kumar <viresh.linux@gmail.com>
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>

diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c
index 41f03f3..8a37f6d 100644 (file)
--- a/drivers/dma/dw_dmac.c
+++ b/drivers/dma/dw_dmac.c
@@ -1431,6 +1431,9 @@ static int __init dw_probe(struct platform_device *pdev)
        }
        clk_prepare_enable(dw->clk);
 
+       /* Calculate all channel mask before DMA setup */
+       dw->all_chan_mask = (1 << pdata->nr_channels) - 1;
+
        /* force dma off, just in case */
        dw_dma_off(dw);
 
@@ -1442,8 +1445,6 @@ static int __init dw_probe(struct platform_device *pdev)
 
        tasklet_init(&dw->tasklet, dw_dma_tasklet, (unsigned long)dw);
 
-       dw->all_chan_mask = (1 << pdata->nr_channels) - 1;
-
        INIT_LIST_HEAD(&dw->dma.channels);
        for (i = 0; i < pdata->nr_channels; i++) {
                struct dw_dma_chan      *dwc = &dw->chan[i];
@@ -1473,17 +1474,12 @@ static int __init dw_probe(struct platform_device *pdev)
                channel_clear_bit(dw, CH_EN, dwc->mask);
        }
 
-       /* Clear/disable all interrupts on all channels. */
+       /* Clear all interrupts on all channels. */
        dma_writel(dw, CLEAR.XFER, dw->all_chan_mask);
        dma_writel(dw, CLEAR.SRC_TRAN, dw->all_chan_mask);
        dma_writel(dw, CLEAR.DST_TRAN, dw->all_chan_mask);
        dma_writel(dw, CLEAR.ERROR, dw->all_chan_mask);
 
-       channel_clear_bit(dw, MASK.XFER, dw->all_chan_mask);
-       channel_clear_bit(dw, MASK.SRC_TRAN, dw->all_chan_mask);
-       channel_clear_bit(dw, MASK.DST_TRAN, dw->all_chan_mask);
-       channel_clear_bit(dw, MASK.ERROR, dw->all_chan_mask);
-
        dma_cap_set(DMA_MEMCPY, dw->dma.cap_mask);
        dma_cap_set(DMA_SLAVE, dw->dma.cap_mask);
        if (pdata->is_private)