[PATCH v4 04/14] soc/tegra: Add devm_tegra_core_dev_init_opp_table()

Dmitry Osipenko
2021-05-27T21:44:08Z

Add common helper which initializes OPP table for Tegra SoC core devices.

Tested-by: Peter Geis <pgwipeout@gmail.com> # Ouya T30
Tested-by: Paul Fertser <fercerpav@gmail.com> # PAZ00 T20
Tested-by: Nicolas Chauvet <kwizart@gmail.com> # PAZ00 T20 and TK1 T124
Tested-by: Matt Merhar <mattmerhar@protonmail.com> # Ouya T30
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
drivers/soc/tegra/common.c | 97 ++++++++++++++++++++++++++++++++++++++
include/soc/tegra/common.h | 22 +++++++++
2 files changed, 119 insertions(+)

diff --git a/drivers/soc/tegra/common.c b/drivers/soc/tegra/common.c
index 3dc54f59cafe..cd33e99249c3 100644
--- a/drivers/soc/tegra/common.c
+++ b/drivers/soc/tegra/common.c
@@ -3,9 +3,16 @@
* Copyright (C) 2014 NVIDIA CORPORATION. All rights reserved.
*/

+#define dev_fmt(fmt) "tegra-soc: " fmt
+
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/export.h>
#include <linux/of.h>
+#include <linux/pm_opp.h>

#include <soc/tegra/common.h>
+#include <soc/tegra/fuse.h>

static const struct of_device_id tegra_machine_match[] = {
{ .compatible = "nvidia,tegra20", },
@@ -31,3 +38,93 @@ bool soc_is_tegra(void)

return match != NULL;
}
+
+static int tegra_core_dev_init_opp_state(struct device *dev)
+{
+ unsigned long rate;
+ struct clk *clk;
+ int err;
+
+ clk = devm_clk_get(dev, NULL);
+ if (IS_ERR(clk)) {
+ dev_err(dev, "failed to get clk: %pe\n", clk);
+ return PTR_ERR(clk);
+ }
+
+ rate = clk_get_rate(clk);
+ if (!rate) {
+ dev_err(dev, "failed to get clk rate\n");
+ return -EINVAL;
+ }
+
+ /* first dummy rate-setting initializes voltage vote */
+ err = dev_pm_opp_set_rate(dev, rate);
+ if (err) {
+ dev_err(dev, "failed to initialize OPP clock: %d\n", err);
+ return err;
+ }
+
+ return 0;
+}
+
+/**
+ * devm_tegra_core_dev_init_opp_table() - initialize OPP table
+ * @dev: device for which OPP table is initialized
+ * @params: pointer to the OPP table configuration
+ *
+ * This function will initialize OPP table and sync OPP state of a Tegra SoC
+ * core device.
+ *
+ * Return: 0 on success or errorno.
+ */
+int devm_tegra_core_dev_init_opp_table(struct device *dev,
+ struct tegra_core_opp_params *params)
+{
+ u32 hw_version;
+ int err;
+
+ err = devm_pm_opp_set_clkname(dev, NULL);
+ if (err) {
+ dev_err(dev, "failed to set OPP clk: %d\n", err);
+ return err;
+ }
+
+ /* Tegra114+ doesn't support OPP yet */
+ if (!of_machine_is_compatible("nvidia,tegra20") &&
+ !of_machine_is_compatible("nvidia,tegra30"))
+ return -ENODEV;
+
+ if (of_machine_is_compatible("nvidia,tegra20"))
+ hw_version = BIT(tegra_sku_info.soc_process_id);
+ else
+ hw_version = BIT(tegra_sku_info.soc_speedo_id);
+
+ err = devm_pm_opp_set_supported_hw(dev, &hw_version, 1);
+ if (err) {
+ dev_err(dev, "failed to set OPP supported HW: %d\n", err);
+ return err;
+ }
+
+ /*
+ * Older device-trees have an empty OPP table, we will get
+ * -ENODEV from devm_pm_opp_of_add_table() in this case.
+ */
+ err = devm_pm_opp_of_add_table(dev);
+ if (err) {
+ if (err == -ENODEV)
+ dev_err_once(dev, "OPP table not found, please update device-tree\n");
+ else
+ dev_err(dev, "failed to add OPP table: %d\n", err);
+
+ return err;
+ }
+
+ if (params->init_state) {
+ err = tegra_core_dev_init_opp_state(dev);
+ if (err)
+ return err;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(devm_tegra_core_dev_init_opp_table);
diff --git a/include/soc/tegra/common.h b/include/soc/tegra/common.h
index 744280ecab5f..af41ad80ec21 100644
--- a/include/soc/tegra/common.h
+++ b/include/soc/tegra/common.h
@@ -6,15 +6,37 @@
#ifndef __SOC_TEGRA_COMMON_H__
#define __SOC_TEGRA_COMMON_H__

+#include <linux/errno.h>
#include <linux/types.h>

+struct device;
+
+/**
+ * Tegra SoC core device OPP table configuration
+ *
+ * @init_state: pre-initialize OPP state of a device
+ */
+struct tegra_core_opp_params {
+ bool init_state;
+};
+
#ifdef CONFIG_ARCH_TEGRA
bool soc_is_tegra(void);
+
+int devm_tegra_core_dev_init_opp_table(struct device *dev,
+ struct tegra_core_opp_params *params);
#else
static inline bool soc_is_tegra(void)
{
return false;
}
+
+static inline int
+devm_tegra_core_dev_init_opp_table(struct device *dev,
+ struct tegra_core_opp_params *params)
+{
+ return -ENODEV;
+}
#endif

#endif /* __SOC_TEGRA_COMMON_H__ */
--
2.30.2