| Message ID | 20231101-gdsc-hwctrl-v3-3-0740ae6b2b04@linaro.org (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | PM: domains: Add control for switching back and forth to HW control | expand |
On Wed, 1 Nov 2023 at 11:06, Abel Vesa <abel.vesa@linaro.org> wrote: > > From: Jagadeesh Kona <quic_jkona@quicinc.com> > > Add support for set and get hwmode callbacks to switch the GDSC between > SW and HW modes. Currently, the GDSC is moved to HW control mode > using HW_CTRL flag and if this flag is present, GDSC is moved to HW > mode as part of GDSC enable itself. The intention is to keep the > HW_CTRL flag functionality as is, since many older chipsets still use > this flag. > > Introduce a new HW_CTRL_TRIGGER flag to switch the GDSC back and forth > between HW/SW modes dynamically at runtime. If HW_CTRL_TRIGGER flag is > present, register set_hwmode_dev callback to switch the GDSC mode which > can be invoked from consumer drivers using dev_pm_genpd_set_hwmode > function. Unlike HW_CTRL flag, HW_CTRL_TRIGGER won't move the GDSC to HW > control mode as part of GDSC enable itself, GDSC will be moved to HW > control mode only when consumer driver explicity calls > dev_pm_genpd_set_hwmode to switch to HW mode. Also add the > dev_pm_genpd_get_hwmode to allow the consumers to read the actual > HW/SW mode from hardware. Can we add two new flags: - HW_CTRL_TRIGGER - DEFAULT_HW_TRIGGER And then define HW_CTRL as HW_CTRL_TRIGGER | DEFAULT_HW_TRIGGER ? This way older platforms will keep existing behaviour, but can gradually migrate to the new callbacks? > > Signed-off-by: Jagadeesh Kona <quic_jkona@quicinc.com> > Signed-off-by: Abel Vesa <abel.vesa@linaro.org> > --- > drivers/clk/qcom/gdsc.c | 32 ++++++++++++++++++++++++++++++++ > drivers/clk/qcom/gdsc.h | 1 + > 2 files changed, 33 insertions(+) > > diff --git a/drivers/clk/qcom/gdsc.c b/drivers/clk/qcom/gdsc.c > index 5358e28122ab..c763524cd5da 100644 > --- a/drivers/clk/qcom/gdsc.c > +++ b/drivers/clk/qcom/gdsc.c > @@ -363,6 +363,34 @@ static int gdsc_disable(struct generic_pm_domain *domain) > return 0; > } > > +static int gdsc_set_hwmode(struct generic_pm_domain *domain, struct device *dev, bool mode) > +{ > + struct gdsc *sc = domain_to_gdsc(domain); > + > + if (sc->rsupply && !regulator_is_enabled(sc->rsupply)) { > + pr_err("Cannot set mode while parent is disabled\n"); > + return -EIO; > + } > + > + return gdsc_hwctrl(sc, mode); > +} > + > +static bool gdsc_get_hwmode(struct generic_pm_domain *domain, struct device *dev) > +{ > + struct gdsc *sc = domain_to_gdsc(domain); > + u32 val; > + int ret; > + > + ret = regmap_read(sc->regmap, sc->gdscr, &val); > + if (ret) > + return ret; > + > + if (val & HW_CONTROL_MASK) > + return true; > + > + return false; > +} > + > static int gdsc_init(struct gdsc *sc) > { > u32 mask, val; > @@ -451,6 +479,10 @@ static int gdsc_init(struct gdsc *sc) > sc->pd.power_off = gdsc_disable; > if (!sc->pd.power_on) > sc->pd.power_on = gdsc_enable; > + if (sc->flags & HW_CTRL_TRIGGER) { > + sc->pd.set_hwmode_dev = gdsc_set_hwmode; > + sc->pd.get_hwmode_dev = gdsc_get_hwmode; > + } > > ret = pm_genpd_init(&sc->pd, NULL, !on); > if (ret) > diff --git a/drivers/clk/qcom/gdsc.h b/drivers/clk/qcom/gdsc.h > index 803512688336..1e2779b823d1 100644 > --- a/drivers/clk/qcom/gdsc.h > +++ b/drivers/clk/qcom/gdsc.h > @@ -67,6 +67,7 @@ struct gdsc { > #define ALWAYS_ON BIT(6) > #define RETAIN_FF_ENABLE BIT(7) > #define NO_RET_PERIPH BIT(8) > +#define HW_CTRL_TRIGGER BIT(9) > struct reset_controller_dev *rcdev; > unsigned int *resets; > unsigned int reset_count; > > -- > 2.34.1 >
On 11/2/2023 2:58 AM, Dmitry Baryshkov wrote: > On Wed, 1 Nov 2023 at 11:06, Abel Vesa <abel.vesa@linaro.org> wrote: >> >> From: Jagadeesh Kona <quic_jkona@quicinc.com> >> >> Add support for set and get hwmode callbacks to switch the GDSC between >> SW and HW modes. Currently, the GDSC is moved to HW control mode >> using HW_CTRL flag and if this flag is present, GDSC is moved to HW >> mode as part of GDSC enable itself. The intention is to keep the >> HW_CTRL flag functionality as is, since many older chipsets still use >> this flag. >> >> Introduce a new HW_CTRL_TRIGGER flag to switch the GDSC back and forth >> between HW/SW modes dynamically at runtime. If HW_CTRL_TRIGGER flag is >> present, register set_hwmode_dev callback to switch the GDSC mode which >> can be invoked from consumer drivers using dev_pm_genpd_set_hwmode >> function. Unlike HW_CTRL flag, HW_CTRL_TRIGGER won't move the GDSC to HW >> control mode as part of GDSC enable itself, GDSC will be moved to HW >> control mode only when consumer driver explicity calls >> dev_pm_genpd_set_hwmode to switch to HW mode. Also add the >> dev_pm_genpd_get_hwmode to allow the consumers to read the actual >> HW/SW mode from hardware. > > Can we add two new flags: > - HW_CTRL_TRIGGER > - DEFAULT_HW_TRIGGER > > And then define HW_CTRL as HW_CTRL_TRIGGER | DEFAULT_HW_TRIGGER ? > > This way older platforms will keep existing behaviour, but can > gradually migrate to the new callbacks? > Thanks Dmitry for your review, The current usecases we have for GDSC's are either use the existing HW_CTRL flag to switch the GDSC to HW mode in gdsc_enable() and back to SW mode in gdsc_disable(). The second usecase is don't switch GDSC mode in gdsc_enable() & gdsc_disable() at all, and switch the GDSC mode only in new callbacks when consumers explicitly request it using dev_pm_genpd_set_hwmode(), this can be achieved using the new HW_CTRL_TRIGGER flag. By defining HW_CTRL as HW_CTRL_TRIGGER | DEFAULT_HW_TRIGGER, it switches the GDSC mode both in enable & disable callbacks and in new callbacks as well. But we currently don't have any usecase that requires this behaviour. Thanks, Jagadeesh >> >> Signed-off-by: Jagadeesh Kona <quic_jkona@quicinc.com> >> Signed-off-by: Abel Vesa <abel.vesa@linaro.org> >> --- >> drivers/clk/qcom/gdsc.c | 32 ++++++++++++++++++++++++++++++++ >> drivers/clk/qcom/gdsc.h | 1 + >> 2 files changed, 33 insertions(+) >> >> diff --git a/drivers/clk/qcom/gdsc.c b/drivers/clk/qcom/gdsc.c >> index 5358e28122ab..c763524cd5da 100644 >> --- a/drivers/clk/qcom/gdsc.c >> +++ b/drivers/clk/qcom/gdsc.c >> @@ -363,6 +363,34 @@ static int gdsc_disable(struct generic_pm_domain *domain) >> return 0; >> } >> >> +static int gdsc_set_hwmode(struct generic_pm_domain *domain, struct device *dev, bool mode) >> +{ >> + struct gdsc *sc = domain_to_gdsc(domain); >> + >> + if (sc->rsupply && !regulator_is_enabled(sc->rsupply)) { >> + pr_err("Cannot set mode while parent is disabled\n"); >> + return -EIO; >> + } >> + >> + return gdsc_hwctrl(sc, mode); >> +} >> + >> +static bool gdsc_get_hwmode(struct generic_pm_domain *domain, struct device *dev) >> +{ >> + struct gdsc *sc = domain_to_gdsc(domain); >> + u32 val; >> + int ret; >> + >> + ret = regmap_read(sc->regmap, sc->gdscr, &val); >> + if (ret) >> + return ret; >> + >> + if (val & HW_CONTROL_MASK) >> + return true; >> + >> + return false; >> +} >> + >> static int gdsc_init(struct gdsc *sc) >> { >> u32 mask, val; >> @@ -451,6 +479,10 @@ static int gdsc_init(struct gdsc *sc) >> sc->pd.power_off = gdsc_disable; >> if (!sc->pd.power_on) >> sc->pd.power_on = gdsc_enable; >> + if (sc->flags & HW_CTRL_TRIGGER) { >> + sc->pd.set_hwmode_dev = gdsc_set_hwmode; >> + sc->pd.get_hwmode_dev = gdsc_get_hwmode; >> + } >> >> ret = pm_genpd_init(&sc->pd, NULL, !on); >> if (ret) >> diff --git a/drivers/clk/qcom/gdsc.h b/drivers/clk/qcom/gdsc.h >> index 803512688336..1e2779b823d1 100644 >> --- a/drivers/clk/qcom/gdsc.h >> +++ b/drivers/clk/qcom/gdsc.h >> @@ -67,6 +67,7 @@ struct gdsc { >> #define ALWAYS_ON BIT(6) >> #define RETAIN_FF_ENABLE BIT(7) >> #define NO_RET_PERIPH BIT(8) >> +#define HW_CTRL_TRIGGER BIT(9) >> struct reset_controller_dev *rcdev; >> unsigned int *resets; >> unsigned int reset_count; >> >> -- >> 2.34.1 >> > >
diff --git a/drivers/clk/qcom/gdsc.c b/drivers/clk/qcom/gdsc.c index 5358e28122ab..c763524cd5da 100644 --- a/drivers/clk/qcom/gdsc.c +++ b/drivers/clk/qcom/gdsc.c @@ -363,6 +363,34 @@ static int gdsc_disable(struct generic_pm_domain *domain) return 0; } +static int gdsc_set_hwmode(struct generic_pm_domain *domain, struct device *dev, bool mode) +{ + struct gdsc *sc = domain_to_gdsc(domain); + + if (sc->rsupply && !regulator_is_enabled(sc->rsupply)) { + pr_err("Cannot set mode while parent is disabled\n"); + return -EIO; + } + + return gdsc_hwctrl(sc, mode); +} + +static bool gdsc_get_hwmode(struct generic_pm_domain *domain, struct device *dev) +{ + struct gdsc *sc = domain_to_gdsc(domain); + u32 val; + int ret; + + ret = regmap_read(sc->regmap, sc->gdscr, &val); + if (ret) + return ret; + + if (val & HW_CONTROL_MASK) + return true; + + return false; +} + static int gdsc_init(struct gdsc *sc) { u32 mask, val; @@ -451,6 +479,10 @@ static int gdsc_init(struct gdsc *sc) sc->pd.power_off = gdsc_disable; if (!sc->pd.power_on) sc->pd.power_on = gdsc_enable; + if (sc->flags & HW_CTRL_TRIGGER) { + sc->pd.set_hwmode_dev = gdsc_set_hwmode; + sc->pd.get_hwmode_dev = gdsc_get_hwmode; + } ret = pm_genpd_init(&sc->pd, NULL, !on); if (ret) diff --git a/drivers/clk/qcom/gdsc.h b/drivers/clk/qcom/gdsc.h index 803512688336..1e2779b823d1 100644 --- a/drivers/clk/qcom/gdsc.h +++ b/drivers/clk/qcom/gdsc.h @@ -67,6 +67,7 @@ struct gdsc { #define ALWAYS_ON BIT(6) #define RETAIN_FF_ENABLE BIT(7) #define NO_RET_PERIPH BIT(8) +#define HW_CTRL_TRIGGER BIT(9) struct reset_controller_dev *rcdev; unsigned int *resets; unsigned int reset_count;