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Commit 904bb4f5 authored by Rajendra Nayak's avatar Rajendra Nayak Committed by Stephen Boyd
Browse files

clk: qcom: gdsc: Add support for gdscs with HW control 



Some GDSCs might support a HW control mode, where in the power
domain (gdsc) is brought in and out of low power state (while
unsued) without any SW assistance, saving power.
Such GDSCs can be configured in a HW control mode when powered on
until they are explicitly requested to be powered off by software.

Signed-off-by: default avatarRajendra Nayak <rnayak@codeaurora.org>
Signed-off-by: default avatarSricharan R <sricharan@codeaurora.org>
Signed-off-by: default avatarStephen Boyd <sboyd@codeaurora.org>
parent 5e2035b9

drivers/clk/qcom/gdsc.c

+18 −0
Original line number Diff line number Diff line
@@ -56,6 +56,13 @@ static int gdsc_is_enabled(struct gdsc *sc, unsigned int reg) 
	return !!(val & PWR_ON_MASK);

}



static int gdsc_hwctrl(struct gdsc *sc, bool en)

{

	u32 val = en ? HW_CONTROL_MASK : 0;



	return regmap_update_bits(sc->regmap, sc->gdscr, HW_CONTROL_MASK, val);

}



static int gdsc_toggle_logic(struct gdsc *sc, bool en)

{

	int ret;
@@ -180,6 +187,10 @@ static int gdsc_enable(struct generic_pm_domain *domain) 
	 */

	udelay(1);



	/* Turn on HW trigger mode if supported */

	if (sc->flags & HW_CTRL)

		return gdsc_hwctrl(sc, true);



	return 0;

}
@@ -191,6 +202,13 @@ static int gdsc_disable(struct generic_pm_domain *domain) 
	if (sc->pwrsts == PWRSTS_ON)

		return gdsc_assert_reset(sc);



	/* Turn off HW trigger mode if supported */

	if (sc->flags & HW_CTRL) {

		ret = gdsc_hwctrl(sc, false);

		if (ret < 0)

			return ret;

	}



	if (sc->pwrsts & PWRSTS_OFF)

		gdsc_clear_mem_on(sc);

drivers/clk/qcom/gdsc.h

+1 −0
Original line number Diff line number Diff line
@@ -52,6 +52,7 @@ struct gdsc { 
	const u8			flags;

#define VOTABLE		BIT(0)

#define CLAMP_IO	BIT(1)

#define HW_CTRL		BIT(2)

	struct reset_controller_dev	*rcdev;

	unsigned int			*resets;

	unsigned int			reset_count;