diff options
Diffstat (limited to 'drivers/dma/dw_dmac.c')
| -rw-r--r-- | drivers/dma/dw_dmac.c | 23 |
1 files changed, 16 insertions, 7 deletions
diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c index 476e9c8..c0c9370 100644 --- a/drivers/dma/dw_dmac.c +++ b/drivers/dma/dw_dmac.c @@ -1600,13 +1600,6 @@ static int dw_probe(struct platform_device *pdev) int err; int i; - pdata = dev_get_platdata(&pdev->dev); - if (!pdata) - pdata = dw_dma_parse_dt(pdev); - - if (!pdata || pdata->nr_channels > DW_DMA_MAX_NR_CHANNELS) - return -EINVAL; - io = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!io) return -EINVAL; @@ -1622,6 +1615,22 @@ static int dw_probe(struct platform_device *pdev) dw_params = dma_read_byaddr(regs, DW_PARAMS); autocfg = dw_params >> DW_PARAMS_EN & 0x1; + pdata = dev_get_platdata(&pdev->dev); + if (!pdata) + pdata = dw_dma_parse_dt(pdev); + + if (!pdata && autocfg) { + pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); + if (!pdata) + return -ENOMEM; + + /* Fill platform data with the default values */ + pdata->is_private = true; + pdata->chan_allocation_order = CHAN_ALLOCATION_ASCENDING; + pdata->chan_priority = CHAN_PRIORITY_ASCENDING; + } else if (!pdata || pdata->nr_channels > DW_DMA_MAX_NR_CHANNELS) + return -EINVAL; + if (autocfg) nr_channels = (dw_params >> DW_PARAMS_NR_CHAN & 0x7) + 1; else |