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author | Naga Sureshkumar Relli <naga.sureshkumar.relli@xilinx.com> | 2018-03-26 18:34:20 +0530 |
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committer | Mark Brown <broonie@kernel.org> | 2018-04-17 11:46:52 +0100 |
commit | 9e3a000362aecb27496e1bb45c5a4725cff0ddb2 (patch) | |
tree | cebe1550b2d5a8188c9603d47b0e77db22020b4e /drivers/spi/spi-zynqmp-gqspi.c | |
parent | 51093cba290a375d51749d5bd61835809fa44853 (diff) | |
download | linux-stable-9e3a000362aecb27496e1bb45c5a4725cff0ddb2.tar.gz linux-stable-9e3a000362aecb27496e1bb45c5a4725cff0ddb2.tar.bz2 linux-stable-9e3a000362aecb27496e1bb45c5a4725cff0ddb2.zip |
spi: zynqmp: Add pm runtime support
This patch adds runtime pm functions.
Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Signed-off-by: Naga Sureshkumar Relli <nagasure@xilinx.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/spi-zynqmp-gqspi.c')
-rw-r--r-- | drivers/spi/spi-zynqmp-gqspi.c | 86 |
1 files changed, 70 insertions, 16 deletions
diff --git a/drivers/spi/spi-zynqmp-gqspi.c b/drivers/spi/spi-zynqmp-gqspi.c index 18aeaceee286..26d1ac3bf496 100644 --- a/drivers/spi/spi-zynqmp-gqspi.c +++ b/drivers/spi/spi-zynqmp-gqspi.c @@ -20,6 +20,7 @@ #include <linux/of_irq.h> #include <linux/of_address.h> #include <linux/platform_device.h> +#include <linux/pm_runtime.h> #include <linux/spi/spi.h> #include <linux/spinlock.h> #include <linux/workqueue.h> @@ -135,6 +136,7 @@ #define GQSPI_DMA_UNALIGN 0x3 #define GQSPI_DEFAULT_NUM_CS 1 /* Default number of chip selects */ +#define SPI_AUTOSUSPEND_TIMEOUT 3000 enum mode_type {GQSPI_MODE_IO, GQSPI_MODE_DMA}; /** @@ -356,21 +358,9 @@ static void zynqmp_qspi_copy_read_data(struct zynqmp_qspi *xqspi, static int zynqmp_prepare_transfer_hardware(struct spi_master *master) { struct zynqmp_qspi *xqspi = spi_master_get_devdata(master); - int ret; - - ret = clk_enable(xqspi->refclk); - if (ret) - return ret; - - ret = clk_enable(xqspi->pclk); - if (ret) - goto clk_err; zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, GQSPI_EN_MASK); return 0; -clk_err: - clk_disable(xqspi->refclk); - return ret; } /** @@ -387,8 +377,6 @@ static int zynqmp_unprepare_transfer_hardware(struct spi_master *master) struct zynqmp_qspi *xqspi = spi_master_get_devdata(master); zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, 0x0); - clk_disable(xqspi->refclk); - clk_disable(xqspi->pclk); return 0; } @@ -959,11 +947,67 @@ static int __maybe_unused zynqmp_qspi_resume(struct device *dev) spi_master_resume(master); + clk_disable(xqspi->refclk); + clk_disable(xqspi->pclk); return 0; } -static SIMPLE_DEV_PM_OPS(zynqmp_qspi_dev_pm_ops, zynqmp_qspi_suspend, - zynqmp_qspi_resume); +/** + * zynqmp_runtime_suspend - Runtime suspend method for the SPI driver + * @dev: Address of the platform_device structure + * + * This function disables the clocks + * + * Return: Always 0 + */ +static int __maybe_unused zynqmp_runtime_suspend(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct spi_master *master = platform_get_drvdata(pdev); + struct zynqmp_qspi *xqspi = spi_master_get_devdata(master); + + clk_disable(xqspi->refclk); + clk_disable(xqspi->pclk); + + return 0; +} + +/** + * zynqmp_runtime_resume - Runtime resume method for the SPI driver + * @dev: Address of the platform_device structure + * + * This function enables the clocks + * + * Return: 0 on success and error value on error + */ +static int __maybe_unused zynqmp_runtime_resume(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct spi_master *master = platform_get_drvdata(pdev); + struct zynqmp_qspi *xqspi = spi_master_get_devdata(master); + int ret; + + ret = clk_enable(xqspi->pclk); + if (ret) { + dev_err(dev, "Cannot enable APB clock.\n"); + return ret; + } + + ret = clk_enable(xqspi->refclk); + if (ret) { + dev_err(dev, "Cannot enable device clock.\n"); + clk_disable(xqspi->pclk); + return ret; + } + + return 0; +} + +static const struct dev_pm_ops zynqmp_qspi_dev_pm_ops = { + SET_RUNTIME_PM_OPS(zynqmp_runtime_suspend, + zynqmp_runtime_resume, NULL) + SET_SYSTEM_SLEEP_PM_OPS(zynqmp_qspi_suspend, zynqmp_qspi_resume) +}; /** * zynqmp_qspi_probe: Probe method for the QSPI driver @@ -1023,9 +1067,15 @@ static int zynqmp_qspi_probe(struct platform_device *pdev) goto clk_dis_pclk; } + pm_runtime_use_autosuspend(&pdev->dev); + pm_runtime_set_autosuspend_delay(&pdev->dev, SPI_AUTOSUSPEND_TIMEOUT); + pm_runtime_set_active(&pdev->dev); + pm_runtime_enable(&pdev->dev); /* QSPI controller initializations */ zynqmp_qspi_init_hw(xqspi); + pm_runtime_mark_last_busy(&pdev->dev); + pm_runtime_put_autosuspend(&pdev->dev); xqspi->irq = platform_get_irq(pdev, 0); if (xqspi->irq <= 0) { ret = -ENXIO; @@ -1063,6 +1113,8 @@ static int zynqmp_qspi_probe(struct platform_device *pdev) return 0; clk_dis_all: + pm_runtime_set_suspended(&pdev->dev); + pm_runtime_disable(&pdev->dev); clk_disable_unprepare(xqspi->refclk); clk_dis_pclk: clk_disable_unprepare(xqspi->pclk); @@ -1090,6 +1142,8 @@ static int zynqmp_qspi_remove(struct platform_device *pdev) zynqmp_gqspi_write(xqspi, GQSPI_EN_OFST, 0x0); clk_disable_unprepare(xqspi->refclk); clk_disable_unprepare(xqspi->pclk); + pm_runtime_set_suspended(&pdev->dev); + pm_runtime_disable(&pdev->dev); spi_unregister_master(master); |