| Message ID | 1546955444-7549-2-git-send-email-jianxin.pan@amlogic.com (mailing list archive) |
|---|---|
| State | Not Applicable |
| Delegated to: | Neil Armstrong |
| Headers | show |
| Series | clk: meson: add a sub EMMC clock controller support | expand |
On Tue, 2019-01-08 at 21:50 +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/Makefile | 3 ++- > drivers/clk/meson/clkc-audio.h | 8 ------ > drivers/clk/meson/clkc.h | 10 ++++++- > drivers/clk/meson/sclk-div.c | 59 ++++++++++++++++++++++++++++----------- > --- > 4 files changed, 50 insertions(+), 30 deletions(-) > > diff --git a/drivers/clk/meson/Makefile b/drivers/clk/meson/Makefile > index a849aa8..acd8694 100644 > --- a/drivers/clk/meson/Makefile > +++ b/drivers/clk/meson/Makefile > @@ -4,7 +4,8 @@ > > obj-$(CONFIG_COMMON_CLK_AMLOGIC) += clk-pll.o clk-mpll.o clk-phase.o vid- > pll-div.o > obj-$(CONFIG_COMMON_CLK_AMLOGIC) += clk-input.o > -obj-$(CONFIG_COMMON_CLK_AMLOGIC_AUDIO) += clk-triphase.o sclk-div.o > +obj-$(CONFIG_COMMON_CLK_AMLOGIC) += sclk-div.o > +obj-$(CONFIG_COMMON_CLK_AMLOGIC_AUDIO) += clk-triphase.o > obj-$(CONFIG_COMMON_CLK_MESON_AO) += meson-aoclk.o > obj-$(CONFIG_COMMON_CLK_MESON8B) += meson8b.o > obj-$(CONFIG_COMMON_CLK_GXBB) += gxbb.o gxbb-aoclk.o gxbb-aoclk- > 32k.o > diff --git a/drivers/clk/meson/clkc-audio.h b/drivers/clk/meson/clkc-audio.h > index 0a7c157..286ff12 100644 > --- a/drivers/clk/meson/clkc-audio.h > +++ b/drivers/clk/meson/clkc-audio.h > @@ -15,14 +15,6 @@ struct meson_clk_triphase_data { > struct parm ph2; > }; > > -struct meson_sclk_div_data { > - struct parm div; > - struct parm hi; > - unsigned int cached_div; > - struct clk_duty cached_duty; > -}; > - > extern const struct clk_ops meson_clk_triphase_ops; > -extern const struct clk_ops meson_sclk_div_ops; > > #endif /* __MESON_CLKC_AUDIO_H */ > diff --git a/drivers/clk/meson/clkc.h b/drivers/clk/meson/clkc.h > index 6183b22..00b3320 100644 > --- a/drivers/clk/meson/clkc.h > +++ b/drivers/clk/meson/clkc.h > @@ -27,6 +27,14 @@ struct parm { > u8 width; > }; > > +struct meson_sclk_div_data { > + struct parm div; > + struct parm hi; > + unsigned int cached_div; > + struct clk_duty cached_duty; > + u8 flags; > +}; > + > static inline unsigned int meson_parm_read(struct regmap *map, struct parm > *p) > { > unsigned int val; > @@ -118,10 +126,10 @@ struct clk_regmap _name = { > \ > extern const struct clk_ops meson_clk_mpll_ops; > extern const struct clk_ops meson_clk_phase_ops; > extern const struct clk_ops meson_vid_pll_div_ro_ops; > +extern const struct clk_ops meson_sclk_div_ops; > > struct clk_hw *meson_clk_hw_register_input(struct device *dev, > const char *of_name, > const char *clk_name, > unsigned long flags); > - > #endif /* __CLKC_H */ > diff --git a/drivers/clk/meson/sclk-div.c b/drivers/clk/meson/sclk-div.c > index bc64019..a6c425b 100644 > --- a/drivers/clk/meson/sclk-div.c > +++ b/drivers/clk/meson/sclk-div.c > @@ -4,42 +4,60 @@ > * Author: Jerome Brunet <jbrunet@baylibre.com> > * > * Sample clock generator divider: > - * This HW divider gates with value 0 but is otherwise a zero based > divider: > + * This HW divider gates with value 0 > * > * val >= 1 > - * divider = val + 1 > + * divider = val + 1 if ONE_BASED is not set, otherwise divider = val. > * > * The duty cycle may also be set for the LR clock variant. The duty cycle > * ratio is: > * > * hi = [0 - val] > - * duty_cycle = (1 + hi) / (1 + val) > + * duty_cycle = (1 + hi) / (1 + val) if ONE_BASED is not set, otherwise: > + * duty_cycle = hi / (1 + val) > */ > > -#include "clkc-audio.h" > +#include "clkc.h" > > -static inline struct meson_sclk_div_data * > -meson_sclk_div_data(struct clk_regmap *clk) > +static inline int get_reg(int val, unsigned char flag) s/get_reg/sclk_get_reg > { > - return (struct meson_sclk_div_data *)clk->data; > + WARN_ON(val < 1); I don't think this WARN is justified, especially since you are using this function to set the hi value. > + if ((flag & CLK_DIVIDER_ONE_BASED) || !val) I don't like that you make a dependency on the generic divider just for this. Please make your own flag like MESON_SCLK_ONE_BASED > + return val; > + else > + return val - 1; > +} > + > +static inline int get_value(int reg, unsigned char flag) s/get_value/sclk_get_divider > +{ > + if (flag & CLK_DIVIDER_ONE_BASED) > + return reg; > + else > + return reg + 1; > } > > -static int sclk_div_maxval(struct meson_sclk_div_data *sclk) > +static inline struct meson_sclk_div_data * > +meson_sclk_div_data(struct clk_regmap *clk) > { > - return (1 << sclk->div.width) - 1; > + return (struct meson_sclk_div_data *)clk->data; > } > > static int sclk_div_maxdiv(struct meson_sclk_div_data *sclk) > { > - return sclk_div_maxval(sclk) + 1; > + unsigned int reg = clk_div_mask(sclk->div.width); same here, leave the generic divider alone. `(1 << sclk->div.width) - 1` was fine to get max register value. > + > + return get_value(reg, sclk->flags); > } > > 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 = get_value(1, sclk->flags); maxdiv is provided as a param while mindiv is computed inside this function. let's be coherent and pick one approach. > > - return clamp(div, 2, maxdiv); > + return clamp(div, mindiv, maxdiv); > } > > static int sclk_div_bestdiv(struct clk_hw *hw, unsigned long rate, > @@ -47,7 +65,7 @@ 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 +82,9 @@ 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 = get_value(1, sclk->flags); > > - 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 > @@ -111,10 +130,7 @@ static void sclk_apply_ratio(struct clk_regmap *clk, > sclk->cached_duty.num, > sclk->cached_duty.den); > > - if (hi) > - hi -= 1; > - > - meson_parm_write(clk->map, &sclk->hi, hi); > + meson_parm_write(clk->map, &sclk->hi, get_reg(hi, sclk->flags)); > } > > static int sclk_div_set_duty_cycle(struct clk_hw *hw, > @@ -145,7 +161,7 @@ static int sclk_div_get_duty_cycle(struct clk_hw *hw, > } > > hi = meson_parm_read(clk->map, &sclk->hi); > - duty->num = hi + 1; > + duty->num = get_value(hi, sclk->flags); > duty->den = sclk->cached_div; > return 0; > } > @@ -153,10 +169,13 @@ 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 = get_reg(sclk->cached_div, sclk->flags); > + meson_parm_write(clk->map, &sclk->div, div); > } > > static int sclk_div_set_rate(struct clk_hw *hw, unsigned long rate, > @@ -224,7 +243,7 @@ static void sclk_div_init(struct clk_hw *hw) > if (!val) > sclk->cached_div = sclk_div_maxdiv(sclk); > else > - sclk->cached_div = val + 1; > + sclk->cached_div = get_value(val, sclk->flags); > > sclk_div_get_duty_cycle(hw, &sclk->cached_duty); > }
Hi Jerome, On 2019/1/22 17:25, Jerome Brunet wrote: > On Tue, 2019-01-08 at 21:50 +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/Makefile | 3 ++- >> drivers/clk/meson/clkc-audio.h | 8 ------ >> drivers/clk/meson/clkc.h | 10 ++++++- >> drivers/clk/meson/sclk-div.c | 59 ++++++++++++++++++++++++++++----------- >> --- >> 4 files changed, 50 insertions(+), 30 deletions(-) >> >> diff --git a/drivers/clk/meson/Makefile b/drivers/clk/meson/Makefile >> index a849aa8..acd8694 100644 >> --- a/drivers/clk/meson/Makefile >> +++ b/drivers/clk/meson/Makefile >> @@ -4,7 +4,8 @@ >> >> obj-$(CONFIG_COMMON_CLK_AMLOGIC) += clk-pll.o clk-mpll.o clk-phase.o vid- >> pll-div.o >> obj-$(CONFIG_COMMON_CLK_AMLOGIC) += clk-input.o >> -obj-$(CONFIG_COMMON_CLK_AMLOGIC_AUDIO) += clk-triphase.o sclk-div.o >> +obj-$(CONFIG_COMMON_CLK_AMLOGIC) += sclk-div.o >> +obj-$(CONFIG_COMMON_CLK_AMLOGIC_AUDIO) += clk-triphase.o >> obj-$(CONFIG_COMMON_CLK_MESON_AO) += meson-aoclk.o >> obj-$(CONFIG_COMMON_CLK_MESON8B) += meson8b.o >> obj-$(CONFIG_COMMON_CLK_GXBB) += gxbb.o gxbb-aoclk.o gxbb-aoclk- >> 32k.o >> diff --git a/drivers/clk/meson/clkc-audio.h b/drivers/clk/meson/clkc-audio.h >> index 0a7c157..286ff12 100644 >> --- a/drivers/clk/meson/clkc-audio.h >> +++ b/drivers/clk/meson/clkc-audio.h >> @@ -15,14 +15,6 @@ struct meson_clk_triphase_data { >> struct parm ph2; >> }; >> >> -struct meson_sclk_div_data { >> - struct parm div; >> - struct parm hi; >> - unsigned int cached_div; >> - struct clk_duty cached_duty; >> -}; >> - >> extern const struct clk_ops meson_clk_triphase_ops; >> -extern const struct clk_ops meson_sclk_div_ops; >> >> #endif /* __MESON_CLKC_AUDIO_H */ >> diff --git a/drivers/clk/meson/clkc.h b/drivers/clk/meson/clkc.h >> index 6183b22..00b3320 100644 >> --- a/drivers/clk/meson/clkc.h >> +++ b/drivers/clk/meson/clkc.h >> @@ -27,6 +27,14 @@ struct parm { >> u8 width; >> }; >> >> +struct meson_sclk_div_data { >> + struct parm div; >> + struct parm hi; >> + unsigned int cached_div; >> + struct clk_duty cached_duty; >> + u8 flags; >> +}; >> + >> static inline unsigned int meson_parm_read(struct regmap *map, struct parm >> *p) >> { >> unsigned int val; >> @@ -118,10 +126,10 @@ struct clk_regmap _name = { >> \ >> extern const struct clk_ops meson_clk_mpll_ops; >> extern const struct clk_ops meson_clk_phase_ops; >> extern const struct clk_ops meson_vid_pll_div_ro_ops; >> +extern const struct clk_ops meson_sclk_div_ops; >> >> struct clk_hw *meson_clk_hw_register_input(struct device *dev, >> const char *of_name, >> const char *clk_name, >> unsigned long flags); >> - >> #endif /* __CLKC_H */ >> diff --git a/drivers/clk/meson/sclk-div.c b/drivers/clk/meson/sclk-div.c >> index bc64019..a6c425b 100644 >> --- a/drivers/clk/meson/sclk-div.c >> +++ b/drivers/clk/meson/sclk-div.c >> @@ -4,42 +4,60 @@ >> * Author: Jerome Brunet <jbrunet@baylibre.com> >> * >> * Sample clock generator divider: >> - * This HW divider gates with value 0 but is otherwise a zero based >> divider: >> + * This HW divider gates with value 0 >> * >> * val >= 1 >> - * divider = val + 1 >> + * divider = val + 1 if ONE_BASED is not set, otherwise divider = val. >> * >> * The duty cycle may also be set for the LR clock variant. The duty cycle >> * ratio is: >> * >> * hi = [0 - val] >> - * duty_cycle = (1 + hi) / (1 + val) >> + * duty_cycle = (1 + hi) / (1 + val) if ONE_BASED is not set, otherwise: >> + * duty_cycle = hi / (1 + val) >> */ >> >> -#include "clkc-audio.h" >> +#include "clkc.h" >> >> -static inline struct meson_sclk_div_data * >> -meson_sclk_div_data(struct clk_regmap *clk) >> +static inline int get_reg(int val, unsigned char flag) > > s/get_reg/sclk_get_reg OK, I will rename get_reg and get_value in next version. Thank you for the review. > >> { >> - return (struct meson_sclk_div_data *)clk->data; >> + WARN_ON(val < 1); > > I don't think this WARN is justified, especially since you are using this > function to set the hi value. OK, it will remove it. Thank you. > >> + if ((flag & CLK_DIVIDER_ONE_BASED) || !val) > > I don't like that you make a dependency on the generic divider just for this. > Please make your own flag like MESON_SCLK_ONE_BASED OK, I will define a new flag MESON_SCLK_ONE_BASED in drivers/clk/meson/clkc.h. > >> + return val; >> + else >> + return val - 1; >> +} >> + >> +static inline int get_value(int reg, unsigned char flag) > > s/get_value/sclk_get_divider OK, I will rename it. > >> +{ >> + if (flag & CLK_DIVIDER_ONE_BASED) >> + return reg; >> + else >> + return reg + 1; >> } >> >> -static int sclk_div_maxval(struct meson_sclk_div_data *sclk) >> +static inline struct meson_sclk_div_data * >> +meson_sclk_div_data(struct clk_regmap *clk) >> { >> - return (1 << sclk->div.width) - 1; >> + return (struct meson_sclk_div_data *)clk->data; >> } >> >> static int sclk_div_maxdiv(struct meson_sclk_div_data *sclk) >> { >> - return sclk_div_maxval(sclk) + 1; >> + unsigned int reg = clk_div_mask(sclk->div.width); > > same here, leave the generic divider alone. > > `(1 << sclk->div.width) - 1` was fine to get max register value. > >> + >> + return get_value(reg, sclk->flags); >> } >> >> 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 = get_value(1, sclk->flags); > > maxdiv is provided as a param while mindiv is computed inside this function. > let's be coherent and pick one approach. OK, I will compute min and max in this function both. Thank you for your review. > >> >> - return clamp(div, 2, maxdiv); >> + return clamp(div, mindiv, maxdiv); >> } >> >> static int sclk_div_bestdiv(struct clk_hw *hw, unsigned long rate, >> @@ -47,7 +65,7 @@ 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 +82,9 @@ 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 = get_value(1, sclk->flags); >> >> - 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 >> @@ -111,10 +130,7 @@ static void sclk_apply_ratio(struct clk_regmap *clk, >> sclk->cached_duty.num, >> sclk->cached_duty.den); >> >> - if (hi) >> - hi -= 1; >> - >> - meson_parm_write(clk->map, &sclk->hi, hi); >> + meson_parm_write(clk->map, &sclk->hi, get_reg(hi, sclk->flags)); >> } >> >> static int sclk_div_set_duty_cycle(struct clk_hw *hw, >> @@ -145,7 +161,7 @@ static int sclk_div_get_duty_cycle(struct clk_hw *hw, >> } >> >> hi = meson_parm_read(clk->map, &sclk->hi); >> - duty->num = hi + 1; >> + duty->num = get_value(hi, sclk->flags); >> duty->den = sclk->cached_div; >> return 0; >> } >> @@ -153,10 +169,13 @@ 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 = get_reg(sclk->cached_div, sclk->flags); >> + meson_parm_write(clk->map, &sclk->div, div); >> } >> >> static int sclk_div_set_rate(struct clk_hw *hw, unsigned long rate, >> @@ -224,7 +243,7 @@ static void sclk_div_init(struct clk_hw *hw) >> if (!val) >> sclk->cached_div = sclk_div_maxdiv(sclk); >> else >> - sclk->cached_div = val + 1; >> + sclk->cached_div = get_value(val, sclk->flags); >> >> sclk_div_get_duty_cycle(hw, &sclk->cached_duty); >> } > > > . >
diff --git a/drivers/clk/meson/Makefile b/drivers/clk/meson/Makefile index a849aa8..acd8694 100644 --- a/drivers/clk/meson/Makefile +++ b/drivers/clk/meson/Makefile @@ -4,7 +4,8 @@ obj-$(CONFIG_COMMON_CLK_AMLOGIC) += clk-pll.o clk-mpll.o clk-phase.o vid-pll-div.o obj-$(CONFIG_COMMON_CLK_AMLOGIC) += clk-input.o -obj-$(CONFIG_COMMON_CLK_AMLOGIC_AUDIO) += clk-triphase.o sclk-div.o +obj-$(CONFIG_COMMON_CLK_AMLOGIC) += sclk-div.o +obj-$(CONFIG_COMMON_CLK_AMLOGIC_AUDIO) += clk-triphase.o obj-$(CONFIG_COMMON_CLK_MESON_AO) += meson-aoclk.o obj-$(CONFIG_COMMON_CLK_MESON8B) += meson8b.o obj-$(CONFIG_COMMON_CLK_GXBB) += gxbb.o gxbb-aoclk.o gxbb-aoclk-32k.o diff --git a/drivers/clk/meson/clkc-audio.h b/drivers/clk/meson/clkc-audio.h index 0a7c157..286ff12 100644 --- a/drivers/clk/meson/clkc-audio.h +++ b/drivers/clk/meson/clkc-audio.h @@ -15,14 +15,6 @@ struct meson_clk_triphase_data { struct parm ph2; }; -struct meson_sclk_div_data { - struct parm div; - struct parm hi; - unsigned int cached_div; - struct clk_duty cached_duty; -}; - extern const struct clk_ops meson_clk_triphase_ops; -extern const struct clk_ops meson_sclk_div_ops; #endif /* __MESON_CLKC_AUDIO_H */ diff --git a/drivers/clk/meson/clkc.h b/drivers/clk/meson/clkc.h index 6183b22..00b3320 100644 --- a/drivers/clk/meson/clkc.h +++ b/drivers/clk/meson/clkc.h @@ -27,6 +27,14 @@ struct parm { u8 width; }; +struct meson_sclk_div_data { + struct parm div; + struct parm hi; + unsigned int cached_div; + struct clk_duty cached_duty; + u8 flags; +}; + static inline unsigned int meson_parm_read(struct regmap *map, struct parm *p) { unsigned int val; @@ -118,10 +126,10 @@ struct clk_regmap _name = { \ extern const struct clk_ops meson_clk_mpll_ops; extern const struct clk_ops meson_clk_phase_ops; extern const struct clk_ops meson_vid_pll_div_ro_ops; +extern const struct clk_ops meson_sclk_div_ops; struct clk_hw *meson_clk_hw_register_input(struct device *dev, const char *of_name, const char *clk_name, unsigned long flags); - #endif /* __CLKC_H */ diff --git a/drivers/clk/meson/sclk-div.c b/drivers/clk/meson/sclk-div.c index bc64019..a6c425b 100644 --- a/drivers/clk/meson/sclk-div.c +++ b/drivers/clk/meson/sclk-div.c @@ -4,42 +4,60 @@ * Author: Jerome Brunet <jbrunet@baylibre.com> * * Sample clock generator divider: - * This HW divider gates with value 0 but is otherwise a zero based divider: + * This HW divider gates with value 0 * * val >= 1 - * divider = val + 1 + * divider = val + 1 if ONE_BASED is not set, otherwise divider = val. * * The duty cycle may also be set for the LR clock variant. The duty cycle * ratio is: * * hi = [0 - val] - * duty_cycle = (1 + hi) / (1 + val) + * duty_cycle = (1 + hi) / (1 + val) if ONE_BASED is not set, otherwise: + * duty_cycle = hi / (1 + val) */ -#include "clkc-audio.h" +#include "clkc.h" -static inline struct meson_sclk_div_data * -meson_sclk_div_data(struct clk_regmap *clk) +static inline int get_reg(int val, unsigned char flag) { - return (struct meson_sclk_div_data *)clk->data; + WARN_ON(val < 1); + if ((flag & CLK_DIVIDER_ONE_BASED) || !val) + return val; + else + return val - 1; +} + +static inline int get_value(int reg, unsigned char flag) +{ + if (flag & CLK_DIVIDER_ONE_BASED) + return reg; + else + return reg + 1; } -static int sclk_div_maxval(struct meson_sclk_div_data *sclk) +static inline struct meson_sclk_div_data * +meson_sclk_div_data(struct clk_regmap *clk) { - return (1 << sclk->div.width) - 1; + return (struct meson_sclk_div_data *)clk->data; } static int sclk_div_maxdiv(struct meson_sclk_div_data *sclk) { - return sclk_div_maxval(sclk) + 1; + unsigned int reg = clk_div_mask(sclk->div.width); + + return get_value(reg, sclk->flags); } 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 = get_value(1, sclk->flags); - return clamp(div, 2, maxdiv); + return clamp(div, mindiv, maxdiv); } static int sclk_div_bestdiv(struct clk_hw *hw, unsigned long rate, @@ -47,7 +65,7 @@ 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 +82,9 @@ 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 = get_value(1, sclk->flags); - 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 @@ -111,10 +130,7 @@ static void sclk_apply_ratio(struct clk_regmap *clk, sclk->cached_duty.num, sclk->cached_duty.den); - if (hi) - hi -= 1; - - meson_parm_write(clk->map, &sclk->hi, hi); + meson_parm_write(clk->map, &sclk->hi, get_reg(hi, sclk->flags)); } static int sclk_div_set_duty_cycle(struct clk_hw *hw, @@ -145,7 +161,7 @@ static int sclk_div_get_duty_cycle(struct clk_hw *hw, } hi = meson_parm_read(clk->map, &sclk->hi); - duty->num = hi + 1; + duty->num = get_value(hi, sclk->flags); duty->den = sclk->cached_div; return 0; } @@ -153,10 +169,13 @@ 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 = get_reg(sclk->cached_div, sclk->flags); + meson_parm_write(clk->map, &sclk->div, div); } static int sclk_div_set_rate(struct clk_hw *hw, unsigned long rate, @@ -224,7 +243,7 @@ static void sclk_div_init(struct clk_hw *hw) if (!val) sclk->cached_div = sclk_div_maxdiv(sclk); else - sclk->cached_div = val + 1; + sclk->cached_div = get_value(val, sclk->flags); sclk_div_get_duty_cycle(hw, &sclk->cached_duty); }
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/Makefile | 3 ++- drivers/clk/meson/clkc-audio.h | 8 ------ drivers/clk/meson/clkc.h | 10 ++++++- drivers/clk/meson/sclk-div.c | 59 ++++++++++++++++++++++++++++-------------- 4 files changed, 50 insertions(+), 30 deletions(-)