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Subject[PATCH v3 09/12] spi: spi-fsl-dspi: Move invariant configs out of dspi_transfer_one_message
Date
From: Vladimir Oltean <vladimir.oltean@nxp.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@nxp.com>
---
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 eab4929330e1..86255d38ffcf 100644
--- a/drivers/spi/spi-fsl-dspi.c
+++ b/drivers/spi/spi-fsl-dspi.c
@@ -909,7 +909,6 @@ 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;

@@ -951,30 +950,11 @@ 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);
@@ -984,11 +964,12 @@ 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);

@@ -1179,7 +1160,7 @@ 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;

@@ -1193,6 +1174,26 @@ 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)
@@ -1348,7 +1349,9 @@ 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
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