From 6902dc2fd57c9d72418f82e00a2af6d2ee7c7e0d Mon Sep 17 00:00:00 2001 From: Dmitry Osipenko Date: Wed, 1 Dec 2021 02:23:30 +0300 Subject: mtd: rawnand: tegra: Add runtime PM and OPP support The NAND on Tegra belongs to the core power domain and we're going to enable GENPD support for the core domain. Now NAND must be resumed using runtime PM API in order to initialize the NAND power state. Add runtime PM and OPP support to the NAND driver. Reviewed-by: Ulf Hansson Acked-by: Miquel Raynal Signed-off-by: Dmitry Osipenko Signed-off-by: Thierry Reding --- drivers/mtd/nand/raw/tegra_nand.c | 58 +++++++++++++++++++++++++++++++++------ 1 file changed, 50 insertions(+), 8 deletions(-) (limited to 'drivers') diff --git a/drivers/mtd/nand/raw/tegra_nand.c b/drivers/mtd/nand/raw/tegra_nand.c index 32431bbe69b8..b36e5260ae27 100644 --- a/drivers/mtd/nand/raw/tegra_nand.c +++ b/drivers/mtd/nand/raw/tegra_nand.c @@ -17,8 +17,11 @@ #include #include #include +#include #include +#include + #define COMMAND 0x00 #define COMMAND_GO BIT(31) #define COMMAND_CLE BIT(30) @@ -1151,6 +1154,7 @@ static int tegra_nand_probe(struct platform_device *pdev) return -ENOMEM; ctrl->dev = &pdev->dev; + platform_set_drvdata(pdev, ctrl); nand_controller_init(&ctrl->controller); ctrl->controller.ops = &tegra_nand_controller_ops; @@ -1166,14 +1170,23 @@ static int tegra_nand_probe(struct platform_device *pdev) if (IS_ERR(ctrl->clk)) return PTR_ERR(ctrl->clk); - err = clk_prepare_enable(ctrl->clk); + err = devm_tegra_core_dev_init_opp_table_common(&pdev->dev); + if (err) + return err; + + /* + * This driver doesn't support active power management yet, + * so we will simply keep device resumed. + */ + pm_runtime_enable(&pdev->dev); + err = pm_runtime_resume_and_get(&pdev->dev); if (err) return err; err = reset_control_reset(rst); if (err) { dev_err(ctrl->dev, "Failed to reset HW: %d\n", err); - goto err_disable_clk; + goto err_put_pm; } writel_relaxed(HWSTATUS_CMD_DEFAULT, ctrl->regs + HWSTATUS_CMD); @@ -1188,21 +1201,20 @@ static int tegra_nand_probe(struct platform_device *pdev) dev_name(&pdev->dev), ctrl); if (err) { dev_err(ctrl->dev, "Failed to get IRQ: %d\n", err); - goto err_disable_clk; + goto err_put_pm; } writel_relaxed(DMA_MST_CTRL_IS_DONE, ctrl->regs + DMA_MST_CTRL); err = tegra_nand_chips_init(ctrl->dev, ctrl); if (err) - goto err_disable_clk; - - platform_set_drvdata(pdev, ctrl); + goto err_put_pm; return 0; -err_disable_clk: - clk_disable_unprepare(ctrl->clk); +err_put_pm: + pm_runtime_put_sync_suspend(ctrl->dev); + pm_runtime_force_suspend(ctrl->dev); return err; } @@ -1219,11 +1231,40 @@ static int tegra_nand_remove(struct platform_device *pdev) nand_cleanup(chip); + pm_runtime_put_sync_suspend(ctrl->dev); + pm_runtime_force_suspend(ctrl->dev); + + return 0; +} + +static int __maybe_unused tegra_nand_runtime_resume(struct device *dev) +{ + struct tegra_nand_controller *ctrl = dev_get_drvdata(dev); + int err; + + err = clk_prepare_enable(ctrl->clk); + if (err) { + dev_err(dev, "Failed to enable clock: %d\n", err); + return err; + } + + return 0; +} + +static int __maybe_unused tegra_nand_runtime_suspend(struct device *dev) +{ + struct tegra_nand_controller *ctrl = dev_get_drvdata(dev); + clk_disable_unprepare(ctrl->clk); return 0; } +static const struct dev_pm_ops tegra_nand_pm = { + SET_RUNTIME_PM_OPS(tegra_nand_runtime_suspend, tegra_nand_runtime_resume, + NULL) +}; + static const struct of_device_id tegra_nand_of_match[] = { { .compatible = "nvidia,tegra20-nand" }, { /* sentinel */ } @@ -1234,6 +1275,7 @@ static struct platform_driver tegra_nand_driver = { .driver = { .name = "tegra-nand", .of_match_table = tegra_nand_of_match, + .pm = &tegra_nand_pm, }, .probe = tegra_nand_probe, .remove = tegra_nand_remove, -- cgit v1.2.3