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spi: s3c64xx: extend driver to make full use of runtime PM autosuspend

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Extend the driver to make full use of runtime PM autosuspend.
Before only the SPI core was instructed to use autosuspend
by setting master->auto_runtime_pm. Nevertheless due to the missing
pm_runtime_use_autosuspend call autosuspend wasn't active.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Heiner Kallweit 2015-09-03 22:39:36 +02:00 committed by Mark Brown
parent 3c863792e9
commit 483867ee20
1 changed files with 18 additions and 8 deletions
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26
drivers/spi/spi-s3c64xx.c
View File

@ -32,6 +32,7 @@
#define MAX_SPI_PORTS 6
#define S3C64XX_SPI_QUIRK_POLL (1 << 0)
#define S3C64XX_SPI_QUIRK_CS_AUTO (1 << 1)
#define AUTOSUSPEND_TIMEOUT 2000
/* Registers and bit-fields */
@ -859,13 +860,15 @@ static int s3c64xx_spi_setup(struct spi_device *spi)
}
}
pm_runtime_put(&sdd->pdev->dev);
pm_runtime_mark_last_busy(&sdd->pdev->dev);
pm_runtime_put_autosuspend(&sdd->pdev->dev);
if (!(sdd->port_conf->quirks & S3C64XX_SPI_QUIRK_CS_AUTO))
writel(S3C64XX_SPI_SLAVE_SIG_INACT, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
return 0;
setup_exit:
pm_runtime_put(&sdd->pdev->dev);
pm_runtime_mark_last_busy(&sdd->pdev->dev);
pm_runtime_put_autosuspend(&sdd->pdev->dev);
/* setup() returns with device de-selected */
if (!(sdd->port_conf->quirks & S3C64XX_SPI_QUIRK_CS_AUTO))
writel(S3C64XX_SPI_SLAVE_SIG_INACT, sdd->regs + S3C64XX_SPI_SLAVE_SEL);
@ -1162,6 +1165,12 @@ static int s3c64xx_spi_probe(struct platform_device *pdev)
goto err2;
}
pm_runtime_set_autosuspend_delay(&pdev->dev, AUTOSUSPEND_TIMEOUT);
pm_runtime_use_autosuspend(&pdev->dev);
pm_runtime_set_active(&pdev->dev);
pm_runtime_enable(&pdev->dev);
pm_runtime_get_sync(&pdev->dev);
/* Setup Deufult Mode */
s3c64xx_spi_hwinit(sdd, sdd->port_id);
@ -1180,13 +1189,10 @@ static int s3c64xx_spi_probe(struct platform_device *pdev)
S3C64XX_SPI_INT_TX_OVERRUN_EN | S3C64XX_SPI_INT_TX_UNDERRUN_EN,
sdd->regs + S3C64XX_SPI_INT_EN);
pm_runtime_set_active(&pdev->dev);
pm_runtime_enable(&pdev->dev);
ret = devm_spi_register_master(&pdev->dev, master);
if (ret != 0) {
dev_err(&pdev->dev, "cannot register SPI master: %d\n", ret);
goto err4;
goto err3;
}
dev_dbg(&pdev->dev, "Samsung SoC SPI Driver loaded for Bus SPI-%d with %d Slaves attached\n",
@ -1195,12 +1201,16 @@ static int s3c64xx_spi_probe(struct platform_device *pdev)
mem_res, (FIFO_LVL_MASK(sdd) >> 1) + 1,
sdd->rx_dma.dmach, sdd->tx_dma.dmach);
pm_runtime_mark_last_busy(&pdev->dev);
pm_runtime_put_autosuspend(&pdev->dev);
return 0;
err4:
err3:
pm_runtime_put_noidle(&pdev->dev);
pm_runtime_disable(&pdev->dev);
pm_runtime_set_suspended(&pdev->dev);
err3:
clk_disable_unprepare(sdd->src_clk);
err2:
clk_disable_unprepare(sdd->clk);