Re: [PATCH 02/11] clk: scmi: Use new determine_rate clock operation

[Cristian Marussi <cristian.marussi@arm.com>]

On Mon, Mar 02, 2026 at 01:39:51PM +0100, Geert Uytterhoeven wrote:
> Hi Cristian,
> 
> On Fri, 27 Feb 2026 at 16:33, Cristian Marussi <cristian.marussi@arm.com> wrote:
> > Use the Clock protocol layer determine_rate logic to calculate the closest
> > rate that can be supported by a specific clock.
> >
> > No functional change.
> >
> > Cc: Brian Masney <bmasney@redhat.com>
> > Cc: Michael Turquette <mturquette@baylibre.com>
> > Cc: Stephen Boyd <sboyd@kernel.org>
> > Cc: linux-clk@vger.kernel.org
> > Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
> 
> > --- a/drivers/clk/clk-scmi.c
> > +++ b/drivers/clk/clk-scmi.c
> > @@ -57,35 +56,17 @@ static unsigned long scmi_clk_recalc_rate(struct clk_hw *hw,
> >  static int scmi_clk_determine_rate(struct clk_hw *hw,
> >                                    struct clk_rate_request *req)
> >  {
> > -       u64 fmin, fmax, ftmp;
> > +       int ret;
> >         struct scmi_clk *clk = to_scmi_clk(hw);
> >
> >         /*
> > -        * We can't figure out what rate it will be, so just return the
> > -        * rate back to the caller. scmi_clk_recalc_rate() will be called
> > -        * after the rate is set and we'll know what rate the clock is
> > +        * If we could not get a better rate scmi_clk_recalc_rate() will be
> > +        * called after the rate is set and we'll know what rate the clock is
> >          * running at then.
> >          */
> > -       if (clk->info->rate_discrete)
> > -               return 0;
> > -
> > -       fmin = clk->info->range.min_rate;
> > -       fmax = clk->info->range.max_rate;
> > -       if (req->rate <= fmin) {
> > -               req->rate = fmin;
> > -
> > -               return 0;
> > -       } else if (req->rate >= fmax) {
> > -               req->rate = fmax;
> > -
> > -               return 0;
> > -       }
> > -
> > -       ftmp = req->rate - fmin;
> > -       ftmp += clk->info->range.step_size - 1; /* to round up */
> > -       do_div(ftmp, clk->info->range.step_size);
> 
> Oh, so the truncation bug exists in the original code, too.

Yep...as said I will fix the original code and then move the fixed
code.

Thanks,
Cristian