From: Boris Brezillon <boris.brezillon@bootlin.com>
Date: Sun, 22 Apr 2018 20:35:15 +0200
Subject: spi: Add an helper to flush the message queue

Git-commit: 988f259b46646934003ff8ae4966f7233691d1ad
Patch-mainline: v4.18-rc1
References: fate#326572

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>
Signed-off-by: Mian Yousaf Kaukab <yousaf.kaukab@suse.com>
---
 drivers/spi/internals.h |  2 ++
 drivers/spi/spi.c       | 16 ++++++++++++++++
 2 files changed, 18 insertions(+)

diff --git a/drivers/spi/internals.h b/drivers/spi/internals.h
index dbe56c77b464..4a28a8395552 100644
--- a/drivers/spi/internals.h
+++ b/drivers/spi/internals.h
@@ -17,6 +17,8 @@
 #include <linux/scatterlist.h>
 #include <linux/spi/spi.h>
 
+void spi_flush_queue(struct spi_controller *ctrl);
+
 #ifdef CONFIG_HAS_DMA
 int spi_map_buf(struct spi_controller *ctlr, struct device *dev,
 		struct sg_table *sgt, void *buf, size_t len,
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 86b778d8563e..3f4666365678 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -1522,6 +1522,22 @@ static int spi_controller_initialize_queue(struct spi_controller *ctlr)
 	return ret;
 }
 
+/**
+ * spi_flush_queue - Send all pending messages in the queue from the callers'
+ *		     context
+ * @ctlr: controller to process queue for
+ *
+ * This should be used when one wants to ensure all pending messages have been
+ * sent before doing something. Is used by the spi-mem code to make sure SPI
+ * memory operations do not preempt regular SPI transfers that have been queued
+ * before the spi-mem operation.
+ */
+void spi_flush_queue(struct spi_controller *ctlr)
+{
+	if (ctlr->transfer == spi_queued_transfer)
+		__spi_pump_messages(ctlr, false);
+}
+
 /*-------------------------------------------------------------------------*/
 
 #if defined(CONFIG_OF)
-- 
2.11.0