From e7cc455fcd07c9c4ad240a392610f31e1e0460cf Mon Sep 17 00:00:00 2001 From: Rajendra Nayak Date: Thu, 20 Oct 2016 15:08:06 +0530 Subject: clk: qcom: Handle the clamp_io assert/deassert sequence Add a flag to mark gdscs which need to support the clamp deassert/assert before and after the gdsc enable/disable Signed-off-by: Rajendra Nayak Signed-off-by: Stephen Boyd --- drivers/clk/qcom/gdsc.c | 26 +++++++++++++++++++++++++- 1 file changed, 25 insertions(+), 1 deletion(-) (limited to 'drivers/clk/qcom/gdsc.c') diff --git a/drivers/clk/qcom/gdsc.c b/drivers/clk/qcom/gdsc.c index f12d7b2bddd7..925d178ba675 100644 --- a/drivers/clk/qcom/gdsc.c +++ b/drivers/clk/qcom/gdsc.c @@ -30,6 +30,7 @@ #define SW_OVERRIDE_MASK BIT(2) #define HW_CONTROL_MASK BIT(1) #define SW_COLLAPSE_MASK BIT(0) +#define GMEM_CLAMP_IO_MASK BIT(0) /* Wait 2^n CXO cycles between all states. Here, n=2 (4 cycles). */ #define EN_REST_WAIT_VAL (0x2 << 20) @@ -140,6 +141,18 @@ static inline void gdsc_clear_mem_on(struct gdsc *sc) regmap_update_bits(sc->regmap, sc->cxcs[i], mask, 0); } +static inline void gdsc_deassert_clamp_io(struct gdsc *sc) +{ + regmap_update_bits(sc->regmap, sc->clamp_io_ctrl, + GMEM_CLAMP_IO_MASK, 0); +} + +static inline void gdsc_assert_clamp_io(struct gdsc *sc) +{ + regmap_update_bits(sc->regmap, sc->clamp_io_ctrl, + GMEM_CLAMP_IO_MASK, 1); +} + static int gdsc_enable(struct generic_pm_domain *domain) { struct gdsc *sc = domain_to_gdsc(domain); @@ -148,6 +161,9 @@ static int gdsc_enable(struct generic_pm_domain *domain) if (sc->pwrsts == PWRSTS_ON) return gdsc_deassert_reset(sc); + if (sc->flags & CLAMP_IO) + gdsc_deassert_clamp_io(sc); + ret = gdsc_toggle_logic(sc, true); if (ret) return ret; @@ -170,6 +186,7 @@ static int gdsc_enable(struct generic_pm_domain *domain) static int gdsc_disable(struct generic_pm_domain *domain) { struct gdsc *sc = domain_to_gdsc(domain); + int ret; if (sc->pwrsts == PWRSTS_ON) return gdsc_assert_reset(sc); @@ -177,7 +194,14 @@ static int gdsc_disable(struct generic_pm_domain *domain) if (sc->pwrsts & PWRSTS_OFF) gdsc_clear_mem_on(sc); - return gdsc_toggle_logic(sc, false); + ret = gdsc_toggle_logic(sc, false); + if (ret) + return ret; + + if (sc->flags & CLAMP_IO) + gdsc_assert_clamp_io(sc); + + return 0; } static int gdsc_init(struct gdsc *sc) -- cgit v1.2.3