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 <[email protected]> --- Changed: - Let driver autosuspend also after leaving s3c64xx_spi_setup - Enable runtime PM earlier in s3c64xx_spi_probe and prevent suspending in the relevant part of probe v2: - Don't init runtime PM before the driver has a reference to the clocks drivers/spi/spi-s3c64xx.c | 26 ++++++++++++++++++-------- 1 file changed, 18 insertions(+), 8 deletions(-) diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c index 8a6ab88..d117fa6 100644 --- a/drivers/spi/spi-s3c64xx.c +++ b/drivers/spi/spi-s3c64xx.c @@ -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); -- 2.5.0 -- To unsubscribe from this list: send the line "unsubscribe linux-spi" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
