[PATCH v11 20/34] mtd: rawnand: tegra: Add runtime PM and OPP support
From: Dmitry Osipenko <digetx@gmail.com>
Date: 2021-09-12 20:11:48
Also in:
dri-devel, linux-clk, linux-devicetree, linux-media, linux-mmc, linux-pm, linux-pwm, linux-spi, linux-staging, linux-tegra, lkml
Subsystem:
memory technology devices (mtd), nand flash subsystem, tegra nand driver, the rest · Maintainers:
Miquel Raynal, Richard Weinberger, Vignesh Raghavendra, Stefan Agner, Lucas Stach, Linus Torvalds
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. Acked-by: Miquel Raynal <miquel.raynal@bootlin.com> Signed-off-by: Dmitry Osipenko <digetx@gmail.com> --- drivers/mtd/nand/raw/tegra_nand.c | 55 ++++++++++++++++++++++++++----- 1 file changed, 47 insertions(+), 8 deletions(-)
diff --git a/drivers/mtd/nand/raw/tegra_nand.c b/drivers/mtd/nand/raw/tegra_nand.c
index fbf67722a049..2cce38c58a26 100644
--- a/drivers/mtd/nand/raw/tegra_nand.c
+++ b/drivers/mtd/nand/raw/tegra_nand.c@@ -17,8 +17,11 @@ #include <linux/mtd/rawnand.h> #include <linux/of.h> #include <linux/platform_device.h> +#include <linux/pm_runtime.h> #include <linux/reset.h> +#include <soc/tegra/common.h> + #define COMMAND 0x00 #define COMMAND_GO BIT(31) #define COMMAND_CLE BIT(30)
@@ -1152,6 +1155,7 @@ 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;
@@ -1168,14 +1172,22 @@ 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_pm_runtime_enable(&pdev->dev); + if (err) + return err; + + err = devm_tegra_core_dev_init_opp_table_common(&pdev->dev); + if (err) + return err; + + 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);
@@ -1190,21 +1202,19 @@ 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(ctrl->dev); return err; }
@@ -1221,11 +1231,39 @@ static int tegra_nand_remove(struct platform_device *pdev) nand_cleanup(chip); + pm_runtime_put(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 */ }
@@ -1236,6 +1274,7 @@ 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,
--
2.32.0