From: Vladimir Oltean Date: Wed, 18 Mar 2020 00:15:59 +0000 (+0200) Subject: spi: spi-fsl-dspi: Fix interrupt-less DMA mode taking an XSPI code path X-Git-Tag: v5.10.7~2120^2~42^2~18 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=826b3a6a34619b934cdc33eeb961fcb99ce92c09;p=platform%2Fkernel%2Flinux-rpi.git spi: spi-fsl-dspi: Fix interrupt-less DMA mode taking an XSPI code path Interrupts are not necessary for DMA functionality, since the completion event is provided by the DMA driver. But if the driver fails to request the IRQ defined in the device tree, it will call dspi_poll which would make the driver hang waiting for data to become available in the RX FIFO. Fixes: c55be3059159 ("spi: spi-fsl-dspi: Use poll mode in case the platform IRQ is missing") Signed-off-by: Vladimir Oltean Tested-by: Michael Walle Link: https://lore.kernel.org/r/20200318001603.9650-9-olteanv@gmail.com Signed-off-by: Mark Brown --- diff --git a/drivers/spi/spi-fsl-dspi.c b/drivers/spi/spi-fsl-dspi.c index 81e22b6eadc7..fcc6f20b6631 100644 --- a/drivers/spi/spi-fsl-dspi.c +++ b/drivers/spi/spi-fsl-dspi.c @@ -965,13 +965,15 @@ static int dspi_transfer_one_message(struct spi_controller *ctlr, goto out; } - if (!dspi->irq) { - do { - status = dspi_poll(dspi); - } while (status == -EINPROGRESS); - } else if (trans_mode != DSPI_DMA_MODE) { - wait_for_completion(&dspi->xfer_done); - reinit_completion(&dspi->xfer_done); + if (trans_mode != DSPI_DMA_MODE) { + if (dspi->irq) { + wait_for_completion(&dspi->xfer_done); + reinit_completion(&dspi->xfer_done); + } else { + do { + status = dspi_poll(dspi); + } while (status == -EINPROGRESS); + } } spi_transfer_delay_exec(transfer);