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Commit 2bca3445 authored Apr 11, 2017 by Vignesh R Committed by Mark Brown Apr 21, 2017

spi: Add can_dma like interface for spi_flash_read



Add an interface analogous to ->can_dma() for spi_flash_read()
interface. This will enable SPI controller drivers to inform SPI core
when not to do DMA mappings.

Signed-off-by: Vignesh R <vigneshr@ti.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

parent cb3c8e5a

drivers/spi/spi.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -2811,7 +2811,7 @@ int spi_flash_read(struct spi_device *spi,

		mutex_lock(&master->bus_lock_mutex);
		mutex_lock(&master->io_mutex);
		if (master->dma_rx) {
		if (master->dma_rx && master->spi_flash_can_dma(spi, msg)) {
		rx_dev = master->dma_rx->device->dev;
		ret = spi_map_buf(master, rx_dev, &msg->rx_sg,
		msg->buf, msg->len,

include/linux/spi/spi.h

+4 −0

Original line number	Diff line number	Diff line
		@@ -375,6 +375,8 @@ static inline void spi_unregister_driver(struct spi_driver *sdrv)
		* @unprepare_message: undo any work done by prepare_message().
		* @spi_flash_read: to support spi-controller hardwares that provide
		* accelerated interface to read from flash devices.
		* @spi_flash_can_dma: analogous to can_dma() interface, but for
		* controllers implementing spi_flash_read.
		* @flash_read_supported: spi device supports flash read
		* @cs_gpios: Array of GPIOs to use as chip select lines; one per CS
		* number. Any individual value may be -ENOENT for CS lines that
		@@ -538,6 +540,8 @@ struct spi_master {
		struct spi_message *message);
		int (spi_flash_read)(struct spi_device spi,
		struct spi_flash_read_message *msg);
		bool (spi_flash_can_dma)(struct spi_device spi,
		struct spi_flash_read_message *msg);
		bool (flash_read_supported)(struct spi_device spi);

		/*