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| author | Shawn Lin <shawn.lin@rock-chips.com> | 2016-03-09 09:11:32 +0100 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2016-03-09 10:10:18 +0100 |
| commit | 61cadcf46cfdb9f7eec70527968c2b91e9823786 (patch) | |
| tree | 0f150c8bbba7b6a890c0cb8530d5448a0926ae35 /drivers/spi/spi-rockchip.c | |
| parent | spi: rockchip: migrate to dmaengine_terminate_async (diff) | |
| download | linux-61cadcf46cfdb9f7eec70527968c2b91e9823786.tar.xz linux-61cadcf46cfdb9f7eec70527968c2b91e9823786.zip | |
spi: rockchip: check requesting dma channel with EPROBE_DEFER
Let's defer probing the driver if the return value of
dma_request_slave_channel is ERR_PTR(-EPROBE_DEFER) instead
of disabling dma capability directly.
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/spi-rockchip.c')
| -rw-r--r-- | drivers/spi/spi-rockchip.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c index b6b8a0bb5b2f..795fd191faa7 100644 --- a/drivers/spi/spi-rockchip.c +++ b/drivers/spi/spi-rockchip.c @@ -730,8 +730,14 @@ static int rockchip_spi_probe(struct platform_device *pdev) master->handle_err = rockchip_spi_handle_err; rs->dma_tx.ch = dma_request_slave_channel(rs->dev, "tx"); - if (!rs->dma_tx.ch) + if (IS_ERR_OR_NULL(rs->dma_tx.ch)) { + /* Check tx to see if we need defer probing driver */ + if (PTR_ERR(rs->dma_tx.ch) == -EPROBE_DEFER) { + ret = -EPROBE_DEFER; + goto err_get_fifo_len; + } dev_warn(rs->dev, "Failed to request TX DMA channel\n"); + } rs->dma_rx.ch = dma_request_slave_channel(rs->dev, "rx"); if (!rs->dma_rx.ch) { |