[PATCH v10 02/19] memory: tegra20: Support hardware versioning and clean up OPP table initialization

Dmitry Osipenko
2020-11-23T00:31:37Z

Support hardware versioning, which is now required for Tegra20 EMC OPP.
Clean up OPP table initialization by using a error code returned by OPP
API for judging about the OPP table presence in a device-tree and remove
OPP regulator initialization because we're now going to use power domain
instead of a raw regulator. This puts Tegra20 EMC OPP preparation on par
with the Tegra30/124 EMC drivers.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
drivers/memory/tegra/tegra20-emc.c | 48 +++++++++++++-----------------
1 file changed, 20 insertions(+), 28 deletions(-)

diff --git a/drivers/memory/tegra/tegra20-emc.c b/drivers/memory/tegra/tegra20-emc.c
index 0320d9df4a20..686aaf477d8a 100644
--- a/drivers/memory/tegra/tegra20-emc.c
+++ b/drivers/memory/tegra/tegra20-emc.c
@@ -910,43 +910,36 @@ static int tegra_emc_interconnect_init(struct tegra_emc *emc)

static int tegra_emc_opp_table_init(struct tegra_emc *emc)
{
- struct opp_table *reg_opp_table = NULL, *clk_opp_table;
- const char *rname = "core";
+ u32 hw_version = BIT(tegra_sku_info.soc_process_id);
+ struct opp_table *clk_opp_table, *hw_opp_table;
int err;

- /*
- * Legacy device-trees don't have OPP table and EMC driver isn't
- * useful in this case.
- */
- if (!device_property_present(emc->dev, "operating-points-v2")) {
- dev_err(emc->dev,
- "OPP table not found, please update your device tree\n");
- return -ENODEV;
- }
-
- /* voltage scaling is optional */
- if (device_property_present(emc->dev, "core-supply")) {
- reg_opp_table = dev_pm_opp_set_regulators(emc->dev, &rname, 1);
- if (IS_ERR(reg_opp_table))
- return dev_err_probe(emc->dev, PTR_ERR(reg_opp_table),
- "failed to set OPP regulator\n");
- }
-
clk_opp_table = dev_pm_opp_set_clkname(emc->dev, NULL);
err = PTR_ERR_OR_ZERO(clk_opp_table);
if (err) {
dev_err(emc->dev, "failed to set OPP clk: %d\n", err);
- goto put_reg_table;
+ return err;
}

- err = dev_pm_opp_of_add_table(emc->dev);
+ hw_opp_table = dev_pm_opp_set_supported_hw(emc->dev, &hw_version, 1);
+ err = PTR_ERR_OR_ZERO(hw_opp_table);
if (err) {
- dev_err(emc->dev, "failed to add OPP table: %d\n", err);
+ dev_err(emc->dev, "failed to set OPP supported HW: %d\n", err);
goto put_clk_table;
}

- dev_info(emc->dev, "current clock rate %lu MHz\n",
- clk_get_rate(emc->clk) / 1000000);
+ err = dev_pm_opp_of_add_table(emc->dev);
+ if (err) {
+ if (err == -ENODEV)
+ dev_err(emc->dev, "OPP table not found, please update your device tree\n");
+ else
+ dev_err(emc->dev, "failed to add OPP table: %d\n", err);
+
+ goto put_hw_table;
+ }
+
+ dev_info(emc->dev, "OPP HW ver. 0x%x, current clock rate %lu MHz\n",
+ hw_version, clk_get_rate(emc->clk) / 1000000);

/* first dummy rate-set initializes voltage state */
err = dev_pm_opp_set_rate(emc->dev, clk_get_rate(emc->clk));
@@ -959,11 +952,10 @@ static int tegra_emc_opp_table_init(struct tegra_emc *emc)

remove_table:
dev_pm_opp_of_remove_table(emc->dev);
+put_hw_table:
+ dev_pm_opp_put_supported_hw(hw_opp_table);
put_clk_table:
dev_pm_opp_put_clkname(clk_opp_table);
-put_reg_table:
- if (reg_opp_table)
- dev_pm_opp_put_regulators(reg_opp_table);

return err;
}
--
2.29.2