Re: [PATCH 1/3] cpufreq: mediatek: add mt8183 cpufreq support

andrew-sh.cheng
2019-02-11T13:19:29Z

On Tue, 2019-01-29 at 15:43 +0530, Viresh Kumar wrote:
> On 29-01-19, 14:35, Andrew-sh Cheng wrote:
> > From: "Andrew-sh.Cheng" <andrew-sh.cheng-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>
> >
> > For new mediatek chip mt8183,
> > cci and little cluster share the same buck,
> > so need to modify the attribute of regulator from exclusive to optional
> >
> > Intermediate clock is not always enabled by ccf in different projects,
> > so cpufreq should always enable it by itself.
> >
> > Signed-off-by: Andrew-sh.Cheng <andrew-sh.cheng-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>
> > ---
> > drivers/cpufreq/cpufreq-dt-platdev.c | 1 +
> > drivers/cpufreq/mediatek-cpufreq.c | 7 ++++++-
> > 2 files changed, 7 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/cpufreq/cpufreq-dt-platdev.c b/drivers/cpufreq/cpufreq-dt-platdev.c
> > index b1c5468..5a1c588 100644
> > --- a/drivers/cpufreq/cpufreq-dt-platdev.c
> > +++ b/drivers/cpufreq/cpufreq-dt-platdev.c
> > @@ -117,6 +117,7 @@
> > { .compatible = "mediatek,mt817x", },
> > { .compatible = "mediatek,mt8173", },
> > { .compatible = "mediatek,mt8176", },
> > + { .compatible = "mediatek,mt8183", },
> >
> > { .compatible = "nvidia,tegra124", },
> >
> > diff --git a/drivers/cpufreq/mediatek-cpufreq.c b/drivers/cpufreq/mediatek-cpufreq.c
> > index eb8920d..e956248 100644
> > --- a/drivers/cpufreq/mediatek-cpufreq.c
> > +++ b/drivers/cpufreq/mediatek-cpufreq.c
> > @@ -355,7 +355,7 @@ static int mtk_cpu_dvfs_info_init(struct mtk_cpu_dvfs_info *info, int cpu)
> > goto out_free_resources;
> > }
> >
> > - proc_reg = regulator_get_exclusive(cpu_dev, "proc");
> > + proc_reg = regulator_get_optional(cpu_dev, "proc");
> > if (IS_ERR(proc_reg)) {
> > if (PTR_ERR(proc_reg) == -EPROBE_DEFER)
> > pr_warn("proc regulator for cpu%d not ready, retry.\n",
> > @@ -385,6 +385,9 @@ static int mtk_cpu_dvfs_info_init(struct mtk_cpu_dvfs_info *info, int cpu)
> > goto out_free_resources;
> > }
> >
> > + ret = clk_prepare_enable(inter_clk);
> > + if (ret)
> > + goto out_free_resources;
>
> Add a blank line here please.
>
> Also out_free_resources isn't enough here and you need to free OPP table as
> well.
I will modify these in next patch.
>
>
> > /* Search a safe voltage for intermediate frequency. */
> > rate = clk_get_rate(inter_clk);
> > opp = dev_pm_opp_find_freq_ceil(cpu_dev, &rate);
> > @@ -412,6 +415,7 @@ static int mtk_cpu_dvfs_info_init(struct mtk_cpu_dvfs_info *info, int cpu)
> >
> > out_free_opp_table:
> > dev_pm_opp_of_cpumask_remove_table(&info->cpus);
> > + clk_disable_unprepare(inter_clk);
>
> Clock was enabled after adding the table, and so it must be disabled before
> removing the table. Just the opposite sequence.
I will modify this in next patch.
>
> >
> > out_free_resources:
> > if (!IS_ERR(proc_reg))
> > @@ -551,6 +555,7 @@ static int mtk_cpufreq_probe(struct platform_device *pdev)
> > { .compatible = "mediatek,mt817x", },
> > { .compatible = "mediatek,mt8173", },
> > { .compatible = "mediatek,mt8176", },
> > + { .compatible = "mediatek,mt8183", },
> >
> > { }
> > };
> > --
> > 1.8.1.1.dirty
>