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From:   Vincent Whitchurch <vincent.whitchurch@axis.com>
To:     <broonie@kernel.org>, <krzysztof.kozlowski@linaro.org>,
        <andi@etezian.org>
CC:     <kernel@axis.com>,
        Vincent Whitchurch <vincent.whitchurch@axis.com>,
        <alim.akhtar@samsung.com>, <linux-spi@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>,
        <linux-samsung-soc@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>
Subject: [PATCH v2 1/4] spi: Save current RX and TX DMA devices
Date:   Tue, 27 Sep 2022 13:21:14 +0200
Message-ID: <20220927112117.77599-2-vincent.whitchurch@axis.com>
In-Reply-To: <20220927112117.77599-1-vincent.whitchurch@axis.com>
References: <20220927112117.77599-1-vincent.whitchurch@axis.com>
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Save the current RX and TX DMA devices to avoid having to duplicate the
logic to pick them, since we'll need access to them in some more
functions to fix a bug in the cache handling.

Signed-off-by: Vincent Whitchurch <vincent.whitchurch@axis.com>
---
 drivers/spi/spi.c       | 19 ++++---------------
 include/linux/spi/spi.h |  4 ++++
 2 files changed, 8 insertions(+), 15 deletions(-)

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index ad254b94308e..dd885df23870 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -1147,6 +1147,8 @@ static int __spi_map_msg(struct spi_controller *ctlr, struct spi_message *msg)
 		}
 	}
 
+	ctlr->cur_rx_dma_dev = rx_dev;
+	ctlr->cur_tx_dma_dev = tx_dev;
 	ctlr->cur_msg_mapped = true;
 
 	return 0;
@@ -1154,26 +1156,13 @@ static int __spi_map_msg(struct spi_controller *ctlr, struct spi_message *msg)
 
 static int __spi_unmap_msg(struct spi_controller *ctlr, struct spi_message *msg)
 {
+	struct device *rx_dev = ctlr->cur_rx_dma_dev;
+	struct device *tx_dev = ctlr->cur_tx_dma_dev;
 	struct spi_transfer *xfer;
-	struct device *tx_dev, *rx_dev;
 
 	if (!ctlr->cur_msg_mapped || !ctlr->can_dma)
 		return 0;
 
-	if (ctlr->dma_tx)
-		tx_dev = ctlr->dma_tx->device->dev;
-	else if (ctlr->dma_map_dev)
-		tx_dev = ctlr->dma_map_dev;
-	else
-		tx_dev = ctlr->dev.parent;
-
-	if (ctlr->dma_rx)
-		rx_dev = ctlr->dma_rx->device->dev;
-	else if (ctlr->dma_map_dev)
-		rx_dev = ctlr->dma_map_dev;
-	else
-		rx_dev = ctlr->dev.parent;
-
 	list_for_each_entry(xfer, &msg->transfers, transfer_list) {
 		if (!ctlr->can_dma(ctlr, msg->spi, xfer))
 			continue;
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index 6ea889df0813..fbf8c0d95968 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -378,6 +378,8 @@ extern struct spi_device *spi_new_ancillary_device(struct spi_device *spi, u8 ch
  * @cleanup: frees controller-specific state
  * @can_dma: determine whether this controller supports DMA
  * @dma_map_dev: device which can be used for DMA mapping
+ * @cur_rx_dma_dev: device which is currently used for RX DMA mapping
+ * @cur_tx_dma_dev: device which is currently used for TX DMA mapping
  * @queued: whether this controller is providing an internal message queue
  * @kworker: pointer to thread struct for message pump
  * @pump_messages: work struct for scheduling work to the message pump
@@ -610,6 +612,8 @@ struct spi_controller {
 					   struct spi_device *spi,
 					   struct spi_transfer *xfer);
 	struct device *dma_map_dev;
+	struct device *cur_rx_dma_dev;
+	struct device *cur_tx_dma_dev;
 
 	/*
 	 * These hooks are for drivers that want to use the generic
-- 
2.34.1