diff mbox series

[v2,3/6] clk: qcom: gdsc: Add set and get hwmode callbacks to switch GDSC mode

Message ID 20230816145741.1472721-4-abel.vesa@linaro.org
State Superseded
Headers show
Series PM: domains: Add control for switching back and forth to HW control | expand

Commit Message

Abel Vesa Aug. 16, 2023, 2:57 p.m. UTC
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.

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(+)

Comments

Konrad Dybcio Aug. 16, 2023, 5:55 p.m. UTC | #1
On 16.08.2023 16:57, Abel Vesa 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.
> 
> 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..3e4a721f1605 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_mode(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_mode(struct generic_pm_domain *domain, struct device *dev)
s/mode/hwmode would probably be more descriptive for returning true/false

Konrad
diff mbox series

Patch

diff --git a/drivers/clk/qcom/gdsc.c b/drivers/clk/qcom/gdsc.c
index 5358e28122ab..3e4a721f1605 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_mode(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_mode(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_mode;
+		sc->pd.get_hwmode_dev = gdsc_get_mode;
+	}
 
 	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;