linux-kernel - [PATCH v5 09/12] spi: spi-fsl-dspi: Move invariant configs out of dspi_transfer_one

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Date:   Wed, 18 Mar 2020 02:16:00 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     broonie@...nel.org
Cc:     linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
        shawnguo@...nel.org, robh+dt@...nel.org, mark.rutland@....com,
        devicetree@...r.kernel.org, eha@...f.com, angelo@...am.it,
        andrew.smirnov@...il.com, gustavo@...eddedor.com, weic@...dia.com,
        mhosny@...dia.com, michael@...le.cc, peng.ma@....com
Subject: [PATCH v5 09/12] spi: spi-fsl-dspi: Move invariant configs out of dspi_transfer_one_message

From: Vladimir Oltean <vladimir.oltean@....com>

The operating mode (DMA, XSPI, EOQ) is not going to change across the
lifetime of the device. So it makes no sense to keep writing to SPI_RSER
on each message. Move this configuration to dspi_init instead.

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
Changes in v5:
None.

Changes in v4:
Patch is new.

 drivers/spi/spi-fsl-dspi.c | 55 ++++++++++++++++++++------------------
 1 file changed, 29 insertions(+), 26 deletions(-)

diff --git a/drivers/spi/spi-fsl-dspi.c b/drivers/spi/spi-fsl-dspi.c
index fcc6f20b6631..5873752a091e 100644
--- a/drivers/spi/spi-fsl-dspi.c
+++ b/drivers/spi/spi-fsl-dspi.c
@@ -900,7 +900,6 @@ static int dspi_transfer_one_message(struct spi_controller *ctlr,
 {
 	struct fsl_dspi *dspi = spi_controller_get_devdata(ctlr);
 	struct spi_device *spi = message->spi;
-	enum dspi_trans_mode trans_mode;
 	struct spi_transfer *transfer;
 	int status = 0;
 
@@ -942,30 +941,11 @@ static int dspi_transfer_one_message(struct spi_controller *ctlr,
 		spi_take_timestamp_pre(dspi->ctlr, dspi->cur_transfer,
 				       dspi->progress, !dspi->irq);
 
-		trans_mode = dspi->devtype_data->trans_mode;
-		switch (trans_mode) {
-		case DSPI_EOQ_MODE:
-			regmap_write(dspi->regmap, SPI_RSER, SPI_RSER_EOQFE);
-			dspi_fifo_write(dspi);
-			break;
-		case DSPI_XSPI_MODE:
-			regmap_write(dspi->regmap, SPI_RSER, SPI_RSER_CMDTCFE);
-			dspi_fifo_write(dspi);
-			break;
-		case DSPI_DMA_MODE:
-			regmap_write(dspi->regmap, SPI_RSER,
-				     SPI_RSER_TFFFE | SPI_RSER_TFFFD |
-				     SPI_RSER_RFDFE | SPI_RSER_RFDFD);
+		if (dspi->devtype_data->trans_mode == DSPI_DMA_MODE) {
 			status = dspi_dma_xfer(dspi);
-			break;
-		default:
-			dev_err(&dspi->pdev->dev, "unsupported trans_mode %u\n",
-				trans_mode);
-			status = -EINVAL;
-			goto out;
-		}
+		} else {
+			dspi_fifo_write(dspi);
 
-		if (trans_mode != DSPI_DMA_MODE) {
 			if (dspi->irq) {
 				wait_for_completion(&dspi->xfer_done);
 				reinit_completion(&dspi->xfer_done);
@@ -975,11 +955,12 @@ static int dspi_transfer_one_message(struct spi_controller *ctlr,
 				} while (status == -EINPROGRESS);
 			}
 		}
+		if (status)
+			break;
 
 		spi_transfer_delay_exec(transfer);
 	}
 
-out:
 	message->status = status;
 	spi_finalize_current_message(ctlr);
 
@@ -1170,7 +1151,7 @@ static const struct regmap_config dspi_xspi_regmap_config[] = {
 	},
 };
 
-static void dspi_init(struct fsl_dspi *dspi)
+static int dspi_init(struct fsl_dspi *dspi)
 {
 	unsigned int mcr;
 
@@ -1184,6 +1165,26 @@ static void dspi_init(struct fsl_dspi *dspi)
 
 	regmap_write(dspi->regmap, SPI_MCR, mcr);
 	regmap_write(dspi->regmap, SPI_SR, SPI_SR_CLEAR);
+
+	switch (dspi->devtype_data->trans_mode) {
+	case DSPI_EOQ_MODE:
+		regmap_write(dspi->regmap, SPI_RSER, SPI_RSER_EOQFE);
+		break;
+	case DSPI_XSPI_MODE:
+		regmap_write(dspi->regmap, SPI_RSER, SPI_RSER_CMDTCFE);
+		break;
+	case DSPI_DMA_MODE:
+		regmap_write(dspi->regmap, SPI_RSER,
+			     SPI_RSER_TFFFE | SPI_RSER_TFFFD |
+			     SPI_RSER_RFDFE | SPI_RSER_RFDFD);
+		break;
+	default:
+		dev_err(&dspi->pdev->dev, "unsupported trans_mode %u\n",
+			dspi->devtype_data->trans_mode);
+		return -EINVAL;
+	}
+
+	return 0;
 }
 
 static int dspi_slave_abort(struct spi_master *master)
@@ -1339,7 +1340,9 @@ static int dspi_probe(struct platform_device *pdev)
 	if (ret)
 		goto out_ctlr_put;
 
-	dspi_init(dspi);
+	ret = dspi_init(dspi);
+	if (ret)
+		goto out_clk_put;
 
 	dspi->irq = platform_get_irq(pdev, 0);
 	if (dspi->irq <= 0) {
-- 
2.17.1