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    SubjectApplied "spi: stm32-qspi: Use dma_request_chan() instead dma_request_slave_channel()" to the spi tree
    The patch

    spi: stm32-qspi: Use dma_request_chan() instead dma_request_slave_channel()

    has been applied to the spi tree at

    https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git for-5.6

    All being well this means that it will be integrated into the linux-next
    tree (usually sometime in the next 24 hours) and sent to Linus during
    the next merge window (or sooner if it is a bug fix), however if
    problems are discovered then the patch may be dropped or reverted.

    You may get further e-mails resulting from automated or manual testing
    and review of the tree, please engage with people reporting problems and
    send followup patches addressing any issues that are reported if needed.

    If any updates are required or you are submitting further changes they
    should be sent as incremental updates against current git, existing
    patches will not be replaced.

    Please add any relevant lists and maintainers to the CCs when replying
    to this mail.

    Thanks,
    Mark

    From 658606ff4cf680ca97380f6ed7295722b0e991b2 Mon Sep 17 00:00:00 2001
    From: Peter Ujfalusi <peter.ujfalusi@ti.com>
    Date: Thu, 12 Dec 2019 15:55:49 +0200
    Subject: [PATCH] spi: stm32-qspi: Use dma_request_chan() instead
    dma_request_slave_channel()

    dma_request_slave_channel() is a wrapper on top of dma_request_chan()
    eating up the error code.

    By using dma_request_chan() directly the driver can support deferred
    probing against DMA.

    Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
    Link: https://lore.kernel.org/r/20191212135550.4634-9-peter.ujfalusi@ti.com
    Signed-off-by: Mark Brown <broonie@kernel.org>
    ---
    drivers/spi/spi-stm32-qspi.c | 30 ++++++++++++++++++++++++------
    1 file changed, 24 insertions(+), 6 deletions(-)

    diff --git a/drivers/spi/spi-stm32-qspi.c b/drivers/spi/spi-stm32-qspi.c
    index 4e726929bb4f..4ef569b47aa6 100644
    --- a/drivers/spi/spi-stm32-qspi.c
    +++ b/drivers/spi/spi-stm32-qspi.c
    @@ -470,10 +470,11 @@ static int stm32_qspi_setup(struct spi_device *spi)
    return 0;
    }

    -static void stm32_qspi_dma_setup(struct stm32_qspi *qspi)
    +static int stm32_qspi_dma_setup(struct stm32_qspi *qspi)
    {
    struct dma_slave_config dma_cfg;
    struct device *dev = qspi->dev;
    + int ret = 0;

    memset(&dma_cfg, 0, sizeof(dma_cfg));

    @@ -484,8 +485,13 @@ static void stm32_qspi_dma_setup(struct stm32_qspi *qspi)
    dma_cfg.src_maxburst = 4;
    dma_cfg.dst_maxburst = 4;

    - qspi->dma_chrx = dma_request_slave_channel(dev, "rx");
    - if (qspi->dma_chrx) {
    + qspi->dma_chrx = dma_request_chan(dev, "rx");
    + if (IS_ERR(qspi->dma_chrx)) {
    + ret = PTR_ERR(qspi->dma_chrx);
    + qspi->dma_chrx = NULL;
    + if (ret == -EPROBE_DEFER)
    + goto out;
    + } else {
    if (dmaengine_slave_config(qspi->dma_chrx, &dma_cfg)) {
    dev_err(dev, "dma rx config failed\n");
    dma_release_channel(qspi->dma_chrx);
    @@ -493,8 +499,11 @@ static void stm32_qspi_dma_setup(struct stm32_qspi *qspi)
    }
    }

    - qspi->dma_chtx = dma_request_slave_channel(dev, "tx");
    - if (qspi->dma_chtx) {
    + qspi->dma_chtx = dma_request_chan(dev, "tx");
    + if (IS_ERR(qspi->dma_chtx)) {
    + ret = PTR_ERR(qspi->dma_chtx);
    + qspi->dma_chtx = NULL;
    + } else {
    if (dmaengine_slave_config(qspi->dma_chtx, &dma_cfg)) {
    dev_err(dev, "dma tx config failed\n");
    dma_release_channel(qspi->dma_chtx);
    @@ -502,7 +511,13 @@ static void stm32_qspi_dma_setup(struct stm32_qspi *qspi)
    }
    }

    +out:
    init_completion(&qspi->dma_completion);
    +
    + if (ret != -EPROBE_DEFER)
    + ret = 0;
    +
    + return ret;
    }

    static void stm32_qspi_dma_free(struct stm32_qspi *qspi)
    @@ -608,7 +623,10 @@ static int stm32_qspi_probe(struct platform_device *pdev)

    qspi->dev = dev;
    platform_set_drvdata(pdev, qspi);
    - stm32_qspi_dma_setup(qspi);
    + ret = stm32_qspi_dma_setup(qspi);
    + if (ret)
    + goto err;
    +
    mutex_init(&qspi->lock);

    ctrl->mode_bits = SPI_RX_DUAL | SPI_RX_QUAD
    --
    2.20.1
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