[PATCH v3 05/10] clk: qcom: cpu-8996: Add support to switch to alternate PLL

[ilialin@codeaurora.org (ilialin at codeaurora.org)]

Will be fixed and respinned.

> -----Original Message-----
> From: Stephen Boyd <sboyd@kernel.org>
> Sent: Monday, March 19, 2018 19:48
> To: Ilia Lin <ilialin@codeaurora.org>; linux-arm-kernel at lists.infradead.org;
> linux-arm-msm at vger.kernel.org; linux-clk at vger.kernel.org;
> sboyd at codeaurora.org
> Cc: mark.rutland at arm.com; devicetree at vger.kernel.org;
> rnayak at codeaurora.org; robh at kernel.org; will.deacon at arm.com;
> amit.kucheria at linaro.org; tfinkel at codeaurora.org; ilialin at codeaurora.org;
> nicolas.dechesne at linaro.org; celster at codeaurora.org
> Subject: Re: [PATCH v3 05/10] clk: qcom: cpu-8996: Add support to switch to
> alternate PLL
> 
> Quoting Ilia Lin (2018-02-14 05:59:47)
> > From: Rajendra Nayak <rnayak@codeaurora.org>
> >
> > Each of the CPU clusters on msm8996 and powered via a primary
> 
> s/and/are/
> 
> > PLL and a secondary PLL. The primary PLL is what drivers the
> 
> s/drivers/drives/
> 
> I make the same typo all the time!
> 
> > CPU clk, except for times when we are reprogramming the PLL itself,
> > when we temporarily switch to an alternate PLL.
> > Use clock rate change notifiers to support this.
> >
> > Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
> > Signed-off-by: Ilia Lin <ilialin@codeaurora.org>
> > ---
> >  drivers/clk/qcom/clk-cpu-8996.c | 35
> > +++++++++++++++++++++++++++++++++++
> >  1 file changed, 35 insertions(+)
> >
> > diff --git a/drivers/clk/qcom/clk-cpu-8996.c
> > b/drivers/clk/qcom/clk-cpu-8996.c index 42489f1..75bd014 100644
> > --- a/drivers/clk/qcom/clk-cpu-8996.c
> > +++ b/drivers/clk/qcom/clk-cpu-8996.c
> > @@ -140,10 +140,14 @@ struct clk_cpu_8996_mux {
> >         u32     reg;
> >         u32     shift;
> >         u32     width;
> > +       struct notifier_block nb;
> >         struct clk_hw   *pll;
> >         struct clk_regmap clkr;
> >  };
> >
> > +#define to_clk_cpu_8996_mux_nb(_nb) \
> > +       container_of(_nb, struct clk_cpu_8996_mux, nb)
> > +
> >  static inline
> >  struct clk_cpu_8996_mux *to_clk_cpu_8996_mux_hw(struct clk_hw *hw)
> {
> > @@ -194,6 +198,27 @@ static int clk_cpu_8996_mux_set_parent(struct
> clk_hw *hw, u8 index)
> >         return 0;
> >  }
> >
> > +int cpu_clk_notifier_cb(struct notifier_block *nb, unsigned long event,
> > +                       void *data)
> > +{
> > +       int ret;
> > +       struct clk_cpu_8996_mux *cpuclk = to_clk_cpu_8996_mux_nb(nb);
> > +
> > +       switch (event) {
> > +       case PRE_RATE_CHANGE:
> > +               ret = clk_cpu_8996_mux_set_parent(&cpuclk->clkr.hw,
> ALT_INDEX);
> > +               break;
> > +       case POST_RATE_CHANGE:
> > +               ret = clk_cpu_8996_mux_set_parent(&cpuclk->clkr.hw,
> PLL_INDEX);
> > +               break;
> > +       default:
> > +               ret = 0;
> > +               break;
> > +       }
> > +
> > +       return notifier_from_errno(ret); };
> > +
> >  const struct clk_ops clk_cpu_8996_mux_ops = {
> >         .set_parent = clk_cpu_8996_mux_set_parent,
> >         .get_parent = clk_cpu_8996_mux_get_parent, @@ -237,6 +262,7 @@
> > static int clk_cpu_8996_mux_set_parent(struct clk_hw *hw, u8 index)
> >         .shift = 0,
> >         .width = 2,
> >         .pll = &pwrcl_pll.clkr.hw,
> > +       .nb.notifier_call = cpu_clk_notifier_cb,
> >         .clkr.hw.init = &(struct clk_init_data) {
> >                 .name = "pwrcl_pmux",
> >                 .parent_names = (const char *[]){ @@ -256,6 +282,7 @@
> > static int clk_cpu_8996_mux_set_parent(struct clk_hw *hw, u8 index)
> >         .shift = 0,
> >         .width = 2,
> >         .pll = &perfcl_pll.clkr.hw,
> > +       .nb.notifier_call = cpu_clk_notifier_cb,
> >         .clkr.hw.init = &(struct clk_init_data) {
> >                 .name = "perfcl_pmux",
> >                 .parent_names = (const char *[]){ @@ -331,6 +358,14 @@
> > struct clk_hw_clks {
> >         clk_alpha_pll_configure(&perfcl_alt_pll, regmap, &altpll_config);
> >         clk_alpha_pll_configure(&pwrcl_alt_pll, regmap,
> > &altpll_config);
> >
> > +       ret = clk_notifier_register(pwrcl_pmux.clkr.hw.clk, &pwrcl_pmux.nb);
> > +       if (ret)
> > +               return ret;
> > +
> > +       ret = clk_notifier_register(perfcl_pmux.clkr.hw.clk,
> &perfcl_pmux.nb);
> > +       if (ret)
> > +               return ret;
> > +
> 
> Please resend this with the other patches that need rework.