| Message ID | 1544457877-51301-5-git-send-email-jianxin.pan@amlogic.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | clk: meson: add a sub EMMC clock controller support | expand |
On Tue, 2018-12-11 at 00:04 +0800, Jianxin Pan wrote: > When CLK_DIVIDER_ONE_BASED flag is set, the sclk divider will be: > one based divider (div = val), and zero value gates the clock > > Signed-off-by: Jianxin Pan <jianxin.pan@amlogic.com> > --- > drivers/clk/meson/clkc-audio.h | 1 + > drivers/clk/meson/sclk-div.c | 28 ++++++++++++++++++---------- > 2 files changed, 19 insertions(+), 10 deletions(-) Such a patch should be done earlier in the series, at least before using sclk in your controller, otherwise thing will be broken in between In general, I would prefer if you had added two helper function to deal with the translation between register value and divider value. Only these function should care about CLK_DIVIDER_ONE_BASED, the rest should just call them. This, we will be able to deal the with HI (duty cycle) part as well, which you completly skiped. I know your device does not have this, but still the code has to make sense. > > diff --git a/drivers/clk/meson/clkc-audio.h b/drivers/clk/meson/clkc-audio.h > index 0a7c157..9bd6ced 100644 > --- a/drivers/clk/meson/clkc-audio.h > +++ b/drivers/clk/meson/clkc-audio.h > @@ -20,6 +20,7 @@ struct meson_sclk_div_data { > struct parm hi; > unsigned int cached_div; > struct clk_duty cached_duty; > + u8 flags; > }; > > extern const struct clk_ops meson_clk_triphase_ops; > diff --git a/drivers/clk/meson/sclk-div.c b/drivers/clk/meson/sclk-div.c > index bc64019..d98707b 100644 > --- a/drivers/clk/meson/sclk-div.c > +++ b/drivers/clk/meson/sclk-div.c > @@ -24,22 +24,23 @@ > return (struct meson_sclk_div_data *)clk->data; > } > > -static int sclk_div_maxval(struct meson_sclk_div_data *sclk) > -{ > - return (1 << sclk->div.width) - 1; > -} > - > static int sclk_div_maxdiv(struct meson_sclk_div_data *sclk) > { > - return sclk_div_maxval(sclk) + 1; > + if (sclk->flags & CLK_DIVIDER_ONE_BASED) > + return clk_div_mask(sclk->div.width); > + else > + return clk_div_mask(sclk->div.width) + 1; seems over complicated. why no call clk_div_mask just once, and add 1 if necessary ? > } > > static int sclk_div_getdiv(struct clk_hw *hw, unsigned long rate, > unsigned long prate, int maxdiv) > { > int div = DIV_ROUND_CLOSEST_ULL((u64)prate, rate); > + struct clk_regmap *clk = to_clk_regmap(hw); > + struct meson_sclk_div_data *sclk = meson_sclk_div_data(clk); > + int mindiv = (sclk->flags & CLK_DIVIDER_ONE_BASED) ? 1 : 2; This is why I want helpers, don't like this above > > - return clamp(div, 2, maxdiv); > + return clamp(div, mindiv, maxdiv); > } > > static int sclk_div_bestdiv(struct clk_hw *hw, unsigned long rate, > @@ -47,7 +48,7 @@ static int sclk_div_bestdiv(struct clk_hw *hw, unsigned > long rate, > struct meson_sclk_div_data *sclk) > { > struct clk_hw *parent = clk_hw_get_parent(hw); > - int bestdiv = 0, i; > + int bestdiv = 0, i, mindiv; > unsigned long maxdiv, now, parent_now; > unsigned long best = 0, best_parent = 0; > > @@ -64,8 +65,9 @@ static int sclk_div_bestdiv(struct clk_hw *hw, unsigned > long rate, > * unsigned long in rate * i below > */ > maxdiv = min(ULONG_MAX / rate, maxdiv); > + mindiv = (sclk->flags & CLK_DIVIDER_ONE_BASED) ? 1 : 2; > > - for (i = 2; i <= maxdiv; i++) { > + for (i = mindiv; i <= maxdiv; i++) { > /* > * It's the most ideal case if the requested rate can be > * divided from parent clock without needing to change > @@ -153,10 +155,14 @@ static int sclk_div_get_duty_cycle(struct clk_hw *hw, > static void sclk_apply_divider(struct clk_regmap *clk, > struct meson_sclk_div_data *sclk) > { > + unsigned int div; > + > if (MESON_PARM_APPLICABLE(&sclk->hi)) > sclk_apply_ratio(clk, sclk); > > - meson_parm_write(clk->map, &sclk->div, sclk->cached_div - 1); > + div = (sclk->flags & CLK_DIVIDER_ONE_BASED) ? > + sclk->cached_div : (sclk->cached_div - 1); helpers again. > + meson_parm_write(clk->map, &sclk->div, div); > } > > static int sclk_div_set_rate(struct clk_hw *hw, unsigned long rate, > @@ -223,6 +229,8 @@ static void sclk_div_init(struct clk_hw *hw) > /* if the divider is initially disabled, assume max */ > if (!val) > sclk->cached_div = sclk_div_maxdiv(sclk); > + else if (sclk->flags & CLK_DIVIDER_ONE_BASED) > + sclk->cached_div = val; > else > sclk->cached_div = val + 1; same ... >
Hi Jerome, Thanks for the fully review, we really appreciate your time. On 2018/12/12 1:16, Jerome Brunet wrote: > On Tue, 2018-12-11 at 00:04 +0800, Jianxin Pan wrote: >> When CLK_DIVIDER_ONE_BASED flag is set, the sclk divider will be: >> one based divider (div = val), and zero value gates the clock >> >> Signed-off-by: Jianxin Pan <jianxin.pan@amlogic.com> >> --- >> drivers/clk/meson/clkc-audio.h | 1 + >> drivers/clk/meson/sclk-div.c | 28 ++++++++++++++++++---------- >> 2 files changed, 19 insertions(+), 10 deletions(-) > > Such a patch should be done earlier in the series, at least before using sclk > in your controller, otherwise thing will be broken in between > I will move it to the first one of the patchset. > In general, I would prefer if you had added two helper function to deal with > the translation between register value and divider value. > > Only these function should care about CLK_DIVIDER_ONE_BASED, the rest should > just call them. > > This, we will be able to deal the with HI (duty cycle) part as well, which you > completly skiped. > > I know your device does not have this, but still the code has to make sense. > OK, I will add two helper for value and register translation, and then appy them to both div and hi. >> >> diff --git a/drivers/clk/meson/clkc-audio.h b/drivers/clk/meson/clkc-audio.h >> index 0a7c157..9bd6ced 100644 >> --- a/drivers/clk/meson/clkc-audio.h >> +++ b/drivers/clk/meson/clkc-audio.h >> @@ -20,6 +20,7 @@ struct meson_sclk_div_data { >> struct parm hi; >> unsigned int cached_div; >> struct clk_duty cached_duty; >> + u8 flags; >> }; >> >> extern const struct clk_ops meson_clk_triphase_ops; >> diff --git a/drivers/clk/meson/sclk-div.c b/drivers/clk/meson/sclk-div.c >> index bc64019..d98707b 100644 >> --- a/drivers/clk/meson/sclk-div.c >> +++ b/drivers/clk/meson/sclk-div.c >> @@ -24,22 +24,23 @@ >> return (struct meson_sclk_div_data *)clk->data; >> } >> >> -static int sclk_div_maxval(struct meson_sclk_div_data *sclk) >> -{ >> - return (1 << sclk->div.width) - 1; >> -} >> - >> static int sclk_div_maxdiv(struct meson_sclk_div_data *sclk) >> { >> - return sclk_div_maxval(sclk) + 1; >> + if (sclk->flags & CLK_DIVIDER_ONE_BASED) >> + return clk_div_mask(sclk->div.width); >> + else >> + return clk_div_mask(sclk->div.width) + 1; > > seems over complicated. > why no call clk_div_mask just once, and add 1 if necessary ? Yes, I will use helper here. > >> } >> >> static int sclk_div_getdiv(struct clk_hw *hw, unsigned long rate, >> unsigned long prate, int maxdiv) >> { >> int div = DIV_ROUND_CLOSEST_ULL((u64)prate, rate); >> + struct clk_regmap *clk = to_clk_regmap(hw); >> + struct meson_sclk_div_data *sclk = meson_sclk_div_data(clk); >> + int mindiv = (sclk->flags & CLK_DIVIDER_ONE_BASED) ? 1 : 2; > > This is why I want helpers, don't like this above OK, I will replace it with helpers. > >> >> - return clamp(div, 2, maxdiv); >> + return clamp(div, mindiv, maxdiv); >> } >> >> static int sclk_div_bestdiv(struct clk_hw *hw, unsigned long rate, >> @@ -47,7 +48,7 @@ static int sclk_div_bestdiv(struct clk_hw *hw, unsigned >> long rate, >> struct meson_sclk_div_data *sclk) >> { >> struct clk_hw *parent = clk_hw_get_parent(hw); >> - int bestdiv = 0, i; >> + int bestdiv = 0, i, mindiv; >> unsigned long maxdiv, now, parent_now; >> unsigned long best = 0, best_parent = 0; >> >> @@ -64,8 +65,9 @@ static int sclk_div_bestdiv(struct clk_hw *hw, unsigned >> long rate, >> * unsigned long in rate * i below >> */ >> maxdiv = min(ULONG_MAX / rate, maxdiv); >> + mindiv = (sclk->flags & CLK_DIVIDER_ONE_BASED) ? 1 : 2; >> >> - for (i = 2; i <= maxdiv; i++) { >> + for (i = mindiv; i <= maxdiv; i++) { >> /* >> * It's the most ideal case if the requested rate can be >> * divided from parent clock without needing to change >> @@ -153,10 +155,14 @@ static int sclk_div_get_duty_cycle(struct clk_hw *hw, >> static void sclk_apply_divider(struct clk_regmap *clk, >> struct meson_sclk_div_data *sclk) >> { >> + unsigned int div; >> + >> if (MESON_PARM_APPLICABLE(&sclk->hi)) >> sclk_apply_ratio(clk, sclk); >> >> - meson_parm_write(clk->map, &sclk->div, sclk->cached_div - 1); >> + div = (sclk->flags & CLK_DIVIDER_ONE_BASED) ? >> + sclk->cached_div : (sclk->cached_div - 1); > > helpers again. OK! > >> + meson_parm_write(clk->map, &sclk->div, div); >> } >> >> static int sclk_div_set_rate(struct clk_hw *hw, unsigned long rate, >> @@ -223,6 +229,8 @@ static void sclk_div_init(struct clk_hw *hw) >> /* if the divider is initially disabled, assume max */ >> if (!val) >> sclk->cached_div = sclk_div_maxdiv(sclk); >> + else if (sclk->flags & CLK_DIVIDER_ONE_BASED) >> + sclk->cached_div = val; >> else >> sclk->cached_div = val + 1; > > same ... OK, I will fix them. Thanks again for your time! > >> > > > . >
diff --git a/drivers/clk/meson/clkc-audio.h b/drivers/clk/meson/clkc-audio.h index 0a7c157..9bd6ced 100644 --- a/drivers/clk/meson/clkc-audio.h +++ b/drivers/clk/meson/clkc-audio.h @@ -20,6 +20,7 @@ struct meson_sclk_div_data { struct parm hi; unsigned int cached_div; struct clk_duty cached_duty; + u8 flags; }; extern const struct clk_ops meson_clk_triphase_ops; diff --git a/drivers/clk/meson/sclk-div.c b/drivers/clk/meson/sclk-div.c index bc64019..d98707b 100644 --- a/drivers/clk/meson/sclk-div.c +++ b/drivers/clk/meson/sclk-div.c @@ -24,22 +24,23 @@ return (struct meson_sclk_div_data *)clk->data; } -static int sclk_div_maxval(struct meson_sclk_div_data *sclk) -{ - return (1 << sclk->div.width) - 1; -} - static int sclk_div_maxdiv(struct meson_sclk_div_data *sclk) { - return sclk_div_maxval(sclk) + 1; + if (sclk->flags & CLK_DIVIDER_ONE_BASED) + return clk_div_mask(sclk->div.width); + else + return clk_div_mask(sclk->div.width) + 1; } static int sclk_div_getdiv(struct clk_hw *hw, unsigned long rate, unsigned long prate, int maxdiv) { int div = DIV_ROUND_CLOSEST_ULL((u64)prate, rate); + struct clk_regmap *clk = to_clk_regmap(hw); + struct meson_sclk_div_data *sclk = meson_sclk_div_data(clk); + int mindiv = (sclk->flags & CLK_DIVIDER_ONE_BASED) ? 1 : 2; - return clamp(div, 2, maxdiv); + return clamp(div, mindiv, maxdiv); } static int sclk_div_bestdiv(struct clk_hw *hw, unsigned long rate, @@ -47,7 +48,7 @@ static int sclk_div_bestdiv(struct clk_hw *hw, unsigned long rate, struct meson_sclk_div_data *sclk) { struct clk_hw *parent = clk_hw_get_parent(hw); - int bestdiv = 0, i; + int bestdiv = 0, i, mindiv; unsigned long maxdiv, now, parent_now; unsigned long best = 0, best_parent = 0; @@ -64,8 +65,9 @@ static int sclk_div_bestdiv(struct clk_hw *hw, unsigned long rate, * unsigned long in rate * i below */ maxdiv = min(ULONG_MAX / rate, maxdiv); + mindiv = (sclk->flags & CLK_DIVIDER_ONE_BASED) ? 1 : 2; - for (i = 2; i <= maxdiv; i++) { + for (i = mindiv; i <= maxdiv; i++) { /* * It's the most ideal case if the requested rate can be * divided from parent clock without needing to change @@ -153,10 +155,14 @@ static int sclk_div_get_duty_cycle(struct clk_hw *hw, static void sclk_apply_divider(struct clk_regmap *clk, struct meson_sclk_div_data *sclk) { + unsigned int div; + if (MESON_PARM_APPLICABLE(&sclk->hi)) sclk_apply_ratio(clk, sclk); - meson_parm_write(clk->map, &sclk->div, sclk->cached_div - 1); + div = (sclk->flags & CLK_DIVIDER_ONE_BASED) ? + sclk->cached_div : (sclk->cached_div - 1); + meson_parm_write(clk->map, &sclk->div, div); } static int sclk_div_set_rate(struct clk_hw *hw, unsigned long rate, @@ -223,6 +229,8 @@ static void sclk_div_init(struct clk_hw *hw) /* if the divider is initially disabled, assume max */ if (!val) sclk->cached_div = sclk_div_maxdiv(sclk); + else if (sclk->flags & CLK_DIVIDER_ONE_BASED) + sclk->cached_div = val; else sclk->cached_div = val + 1;
When CLK_DIVIDER_ONE_BASED flag is set, the sclk divider will be: one based divider (div = val), and zero value gates the clock Signed-off-by: Jianxin Pan <jianxin.pan@amlogic.com> --- drivers/clk/meson/clkc-audio.h | 1 + drivers/clk/meson/sclk-div.c | 28 ++++++++++++++++++---------- 2 files changed, 19 insertions(+), 10 deletions(-)