Re: [PATCH v8 02/26] memory: tegra20-emc: Use dev_pm_opp_set_clkname()

Viresh Kumar
2020-11-11T05:45:48Z

On 11-11-20, 04:14, Dmitry Osipenko wrote:
> The dev_pm_opp_get_opp_table() shouldn't be used by drivers, use
> dev_pm_opp_set_clkname() instead.
>
> Suggested-by: Viresh Kumar <viresh.kumar@linaro.org>
> Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
> ---
> drivers/memory/tegra/tegra20-emc.c | 30 +++++++++++++++++++-----------
> 1 file changed, 19 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/memory/tegra/tegra20-emc.c b/drivers/memory/tegra/tegra20-emc.c
> index 5e10aa97809f..bb3f315c9587 100644
> --- a/drivers/memory/tegra/tegra20-emc.c
> +++ b/drivers/memory/tegra/tegra20-emc.c
> @@ -902,7 +902,7 @@ static int tegra_emc_interconnect_init(struct tegra_emc *emc)
>
> static int tegra_emc_opp_table_init(struct tegra_emc *emc)
> {
> - struct opp_table *opp_table;
> + struct opp_table *reg_opp_table = NULL, *clk_opp_table;
> const char *rname = "core";
> int err;
>
> @@ -917,19 +917,24 @@ static int tegra_emc_opp_table_init(struct tegra_emc *emc)
> }
>
> /* voltage scaling is optional */
> - if (device_property_present(emc->dev, "core-supply"))
> - opp_table = dev_pm_opp_set_regulators(emc->dev, &rname, 1);
> - else
> - opp_table = dev_pm_opp_get_opp_table(emc->dev);
> + 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");
> + }
>
> - if (IS_ERR(opp_table))
> - return dev_err_probe(emc->dev, PTR_ERR(opp_table),
> - "failed to prepare OPP table\n");
> + clk_opp_table = dev_pm_opp_set_clkname(emc->dev, NULL);
> + err = PTR_ERR_OR_ZERO(clk_opp_table);

Don't check for NULL here.

> + if (err) {
> + dev_err(emc->dev, "failed to set OPP clk: %d\n", err);
> + goto put_reg_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_table;
> + goto put_clk_table;
> }
>
> dev_info(emc->dev, "current clock rate %lu MHz\n",
> @@ -946,8 +951,11 @@ static int tegra_emc_opp_table_init(struct tegra_emc *emc)
>
> remove_table:
> dev_pm_opp_of_remove_table(emc->dev);
> -put_table:
> - dev_pm_opp_put_regulators(opp_table);
> +put_clk_table:
> + dev_pm_opp_put_clkname(clk_opp_table);
> +put_reg_table:
> + if (reg_opp_table)

This won't be required after my other patchset and yeah it is a
classic chicken and egg problem we have here :)

Maybe you can fix them separately in 5.11 after everything is applied.

> + dev_pm_opp_put_regulators(reg_opp_table);
>
> return err;
> }
> --
> 2.29.2

--
viresh