spi: Introduce dspi_slave_abort() function for NXP's dspi SPI driver (f4b32390) · Commits · 戴 / test

This change provides the dspi_slave_abort() function, which is a callback for slave_abort() method of SPI controller generic driver. As in the SPI slave mode the transmission is driven by master, any distortion may cause the slave to enter undefined internal state. To avoid this problem the dspi_slave_abort() terminates all pending and ongoing DMA transactions (with sync) and clears internal FIFOs. Signed-off-by:

Lukasz Majewski <lukma@denx.de> Link: https://lore.kernel.org/r/20190924110547.14770-3-lukma@denx.de Signed-off-by:

Mark Brown <broonie@kernel.org>

drivers/spi/spi-fsl-dspi.c

+20 −0

Original line number	Diff line number	Diff line
		@@ -1006,6 +1006,25 @@ static void dspi_init(struct fsl_dspi *dspi)
		SPI_CTARE_FMSZE(0) \| SPI_CTARE_DTCP(1));
		}

		static int dspi_slave_abort(struct spi_master *master)
		{
		struct fsl_dspi *dspi = spi_master_get_devdata(master);

		/*
		* Terminate all pending DMA transactions for the SPI working
		* in SLAVE mode.
		*/
		dmaengine_terminate_sync(dspi->dma->chan_rx);
		dmaengine_terminate_sync(dspi->dma->chan_tx);

		/* Clear the internal DSPI RX and TX FIFO buffers */
		regmap_update_bits(dspi->regmap, SPI_MCR,
		SPI_MCR_CLR_TXF \| SPI_MCR_CLR_RXF,
		SPI_MCR_CLR_TXF \| SPI_MCR_CLR_RXF);

		return 0;
		}

		static int dspi_probe(struct platform_device *pdev)
		{
		struct device_node *np = pdev->dev.of_node;
		@@ -1030,6 +1049,7 @@ static int dspi_probe(struct platform_device *pdev)
		ctlr->dev.of_node = pdev->dev.of_node;

		ctlr->cleanup = dspi_cleanup;
		ctlr->slave_abort = dspi_slave_abort;
		ctlr->mode_bits = SPI_CPOL \| SPI_CPHA \| SPI_LSB_FIRST;

		pdata = dev_get_platdata(&pdev->dev);

Admin message