diff options
Diffstat (limited to 'drivers/spi/spi-pic32.c')
-rw-r--r-- | drivers/spi/spi-pic32.c | 46 |
1 files changed, 30 insertions, 16 deletions
diff --git a/drivers/spi/spi-pic32.c b/drivers/spi/spi-pic32.c index 69f517ec59c6..156961b4ca86 100644 --- a/drivers/spi/spi-pic32.c +++ b/drivers/spi/spi-pic32.c @@ -606,25 +606,30 @@ static void pic32_spi_cleanup(struct spi_device *spi) gpio_direction_output(spi->cs_gpio, !(spi->mode & SPI_CS_HIGH)); } -static void pic32_spi_dma_prep(struct pic32_spi *pic32s, struct device *dev) +static int pic32_spi_dma_prep(struct pic32_spi *pic32s, struct device *dev) { struct spi_master *master = pic32s->master; - dma_cap_mask_t mask; + int ret = 0; - dma_cap_zero(mask); - dma_cap_set(DMA_SLAVE, mask); + master->dma_rx = dma_request_chan(dev, "spi-rx"); + if (IS_ERR(master->dma_rx)) { + if (PTR_ERR(master->dma_rx) == -EPROBE_DEFER) + ret = -EPROBE_DEFER; + else + dev_warn(dev, "RX channel not found.\n"); - master->dma_rx = dma_request_slave_channel_compat(mask, NULL, NULL, - dev, "spi-rx"); - if (!master->dma_rx) { - dev_warn(dev, "RX channel not found.\n"); + master->dma_rx = NULL; goto out_err; } - master->dma_tx = dma_request_slave_channel_compat(mask, NULL, NULL, - dev, "spi-tx"); - if (!master->dma_tx) { - dev_warn(dev, "TX channel not found.\n"); + master->dma_tx = dma_request_chan(dev, "spi-tx"); + if (IS_ERR(master->dma_tx)) { + if (PTR_ERR(master->dma_tx) == -EPROBE_DEFER) + ret = -EPROBE_DEFER; + else + dev_warn(dev, "TX channel not found.\n"); + + master->dma_tx = NULL; goto out_err; } @@ -634,14 +639,20 @@ static void pic32_spi_dma_prep(struct pic32_spi *pic32s, struct device *dev) /* DMA chnls allocated and prepared */ set_bit(PIC32F_DMA_PREP, &pic32s->flags); - return; + return 0; out_err: - if (master->dma_rx) + if (master->dma_rx) { dma_release_channel(master->dma_rx); + master->dma_rx = NULL; + } - if (master->dma_tx) + if (master->dma_tx) { dma_release_channel(master->dma_tx); + master->dma_tx = NULL; + } + + return ret; } static void pic32_spi_dma_unprep(struct pic32_spi *pic32s) @@ -776,7 +787,10 @@ static int pic32_spi_probe(struct platform_device *pdev) master->unprepare_transfer_hardware = pic32_spi_unprepare_hardware; /* optional DMA support */ - pic32_spi_dma_prep(pic32s, &pdev->dev); + ret = pic32_spi_dma_prep(pic32s, &pdev->dev); + if (ret) + goto err_bailout; + if (test_bit(PIC32F_DMA_PREP, &pic32s->flags)) master->can_dma = pic32_spi_can_dma; |