spi: Add an helper to flush the message queue
This is needed by the spi-mem logic to force all messages that have been queued before a memory operation to be sent before we start the memory operation. We do that in order to guarantee that spi-mem operations do not preempt regular SPI transfers. Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com> Signed-off-by: Mark Brown <broonie@kernel.org>
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@ -17,6 +17,8 @@
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#include <linux/scatterlist.h>
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#include <linux/spi/spi.h>
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void spi_flush_queue(struct spi_controller *ctrl);
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#ifdef CONFIG_HAS_DMA
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int spi_map_buf(struct spi_controller *ctlr, struct device *dev,
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struct sg_table *sgt, void *buf, size_t len,
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@ -1522,6 +1522,22 @@ err_init_queue:
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return ret;
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}
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/**
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* spi_flush_queue - Send all pending messages in the queue from the callers'
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* context
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* @ctlr: controller to process queue for
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*
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* This should be used when one wants to ensure all pending messages have been
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* sent before doing something. Is used by the spi-mem code to make sure SPI
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* memory operations do not preempt regular SPI transfers that have been queued
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* before the spi-mem operation.
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*/
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void spi_flush_queue(struct spi_controller *ctlr)
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{
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if (ctlr->transfer == spi_queued_transfer)
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__spi_pump_messages(ctlr, false);
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}
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/*-------------------------------------------------------------------------*/
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#if defined(CONFIG_OF)
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