From a823bb9fbefbac8d8bf37d5b4879ee876f2356c5 Mon Sep 17 00:00:00 2001 From: Rajendra Nayak Date: Tue, 1 Dec 2015 21:42:13 +0530 Subject: clk: qcom: gdsc: Add support for votable gdscs Some gdscs might be controlled via voting registers and might not really disable when the kernel intends to disable them (due to other votes keeping them enabled) Mark these gdscs with a flag for we do not check/wait on a disable status for these gdscs within the kernel disable callback. Also at boot, if these GDSCs are found to be ON, we make sure we vote for them before we inform the genpd framework about their status. If genpd gets no users, it then disables (removes the vote) them as part of genpd_poweroff_unused() Signed-off-by: Rajendra Nayak Signed-off-by: Stephen Boyd --- drivers/clk/qcom/gdsc.c | 18 ++++++++++++++++++ drivers/clk/qcom/gdsc.h | 15 ++++++++------- 2 files changed, 26 insertions(+), 7 deletions(-) (limited to 'drivers/clk') diff --git a/drivers/clk/qcom/gdsc.c b/drivers/clk/qcom/gdsc.c index 9f530b73bd3e..f12d7b2bddd7 100644 --- a/drivers/clk/qcom/gdsc.c +++ b/drivers/clk/qcom/gdsc.c @@ -66,6 +66,17 @@ static int gdsc_toggle_logic(struct gdsc *sc, bool en) if (ret) return ret; + /* If disabling votable gdscs, don't poll on status */ + if ((sc->flags & VOTABLE) && !en) { + /* + * Add a short delay here to ensure that an enable + * right after it was disabled does not put it in an + * unknown state + */ + udelay(TIMEOUT_US); + return 0; + } + if (sc->gds_hw_ctrl) { status_reg = sc->gds_hw_ctrl; /* @@ -199,6 +210,13 @@ static int gdsc_init(struct gdsc *sc) if (on < 0) return on; + /* + * Votable GDSCs can be ON due to Vote from other masters. + * If a Votable GDSC is ON, make sure we have a Vote. + */ + if ((sc->flags & VOTABLE) && on) + gdsc_enable(&sc->pd); + if (on || (sc->pwrsts & PWRSTS_RET)) gdsc_force_mem_on(sc); else diff --git a/drivers/clk/qcom/gdsc.h b/drivers/clk/qcom/gdsc.h index 66a43beb9f57..3bf497c36bdf 100644 --- a/drivers/clk/qcom/gdsc.h +++ b/drivers/clk/qcom/gdsc.h @@ -20,13 +20,6 @@ struct regmap; struct reset_controller_dev; -/* Powerdomain allowable state bitfields */ -#define PWRSTS_OFF BIT(0) -#define PWRSTS_RET BIT(1) -#define PWRSTS_ON BIT(2) -#define PWRSTS_OFF_ON (PWRSTS_OFF | PWRSTS_ON) -#define PWRSTS_RET_ON (PWRSTS_RET | PWRSTS_ON) - /** * struct gdsc - Globally Distributed Switch Controller * @pd: generic power domain @@ -49,6 +42,14 @@ struct gdsc { unsigned int *cxcs; unsigned int cxc_count; const u8 pwrsts; +/* Powerdomain allowable state bitfields */ +#define PWRSTS_OFF BIT(0) +#define PWRSTS_RET BIT(1) +#define PWRSTS_ON BIT(2) +#define PWRSTS_OFF_ON (PWRSTS_OFF | PWRSTS_ON) +#define PWRSTS_RET_ON (PWRSTS_RET | PWRSTS_ON) + const u8 flags; +#define VOTABLE BIT(0) struct reset_controller_dev *rcdev; unsigned int *resets; unsigned int reset_count; -- cgit v1.2.3