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memory: tegra20: Support hardware versioning and clean up OPP table initialization 

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>
Acked-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20201203192439.16177-3-digetx@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
This commit is contained in:
Dmitry Osipenko 2020-12-03 22:24:31 +03:00 committed by Krzysztof Kozlowski
parent 9bd5773e02
commit 7e04ce2a9d
1 changed files with 20 additions and 28 deletions
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48
drivers/memory/tegra/tegra20-emc.c
View File

@ -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;
}
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 set OPP supported HW: %d\n", err);
goto put_clk_table;
}
err = dev_pm_opp_of_add_table(emc->dev);
if (err) {
dev_err(emc->dev, "failed to add OPP table: %d\n", err);
goto put_clk_table;
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, "current clock rate %lu MHz\n",
clk_get_rate(emc->clk) / 1000000);
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;
}