Applied "spi: pl022: Handle cs_change for last transfer" to the spi tree

[Mark Brown <broonie@xxxxxxxxxx>]

The patch

   spi: pl022: Handle cs_change for last transfer

has been applied to the spi tree at

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From c0b07605f1a0285d50596c0243adfa00e3043293 Mon Sep 17 00:00:00 2001
From: Fredrik Ternerot <fredrik.ternerot@xxxxxxxx>
Date: Tue, 13 Nov 2018 13:46:32 +0100
Subject: [PATCH] spi: pl022: Handle cs_change for last transfer

Do not deselect cs when cs_change is set for the last transfer in the
message. In this case, cs_change indicates that cs should stay selected
until the next transfer.

Signed-off-by: Fredrik Ternerot <fredrikt@xxxxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
---
 drivers/spi/spi-pl022.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/spi/spi-pl022.c b/drivers/spi/spi-pl022.c
index 6120e6abcd96..0c793e31d60f 100644
--- a/drivers/spi/spi-pl022.c
+++ b/drivers/spi/spi-pl022.c
@@ -861,11 +861,10 @@ static void dma_callback(void *data)
 
 	/* Update total bytes transferred */
 	msg->actual_length += pl022->cur_transfer->len;
-	if (pl022->cur_transfer->cs_change)
-		pl022_cs_control(pl022, SSP_CHIP_DESELECT);
-
 	/* Move to next transfer */
 	msg->state = next_transfer(pl022);
+	if (msg->state != STATE_DONE && pl022->cur_transfer->cs_change)
+		pl022_cs_control(pl022, SSP_CHIP_DESELECT);
 	tasklet_schedule(&pl022->pump_transfers);
 }
 
@@ -1333,10 +1332,10 @@ static irqreturn_t pl022_interrupt_handler(int irq, void *dev_id)
 		}
 		/* Update total bytes transferred */
 		msg->actual_length += pl022->cur_transfer->len;
-		if (pl022->cur_transfer->cs_change)
-			pl022_cs_control(pl022, SSP_CHIP_DESELECT);
 		/* Move to next transfer */
 		msg->state = next_transfer(pl022);
+		if (msg->state != STATE_DONE && pl022->cur_transfer->cs_change)
+			pl022_cs_control(pl022, SSP_CHIP_DESELECT);
 		tasklet_schedule(&pl022->pump_transfers);
 		return IRQ_HANDLED;
 	}
@@ -1544,10 +1543,11 @@ static void do_polling_transfer(struct pl022 *pl022)
 
 		/* Update total byte transferred */
 		message->actual_length += pl022->cur_transfer->len;
-		if (pl022->cur_transfer->cs_change)
-			pl022_cs_control(pl022, SSP_CHIP_DESELECT);
 		/* Move to next transfer */
 		message->state = next_transfer(pl022);
+		if (message->state != STATE_DONE
+		    && pl022->cur_transfer->cs_change)
+			pl022_cs_control(pl022, SSP_CHIP_DESELECT);
 	}
 out:
 	/* Handle end of message */
-- 
2.19.1