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Subject[PATCH v2 2/5] clk: qcom: gdsc: Support 'synced_poweroff' genpd flag
Date
Add support for the newly added 'synced_poweroff' genpd flag. This allows
some clients (like adreno gpu driver) to request gdsc driver to ensure
a votable gdsc (like gpucc cx gdsc) has collapsed at hardware.

Signed-off-by: Akhil P Oommen <quic_akhilpo@quicinc.com>
---

(no changes since v1)

drivers/clk/qcom/gdsc.c | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/clk/qcom/gdsc.c b/drivers/clk/qcom/gdsc.c
index 9e4d6ce891aa..575019ba4768 100644
--- a/drivers/clk/qcom/gdsc.c
+++ b/drivers/clk/qcom/gdsc.c
@@ -136,7 +136,8 @@ static int gdsc_update_collapse_bit(struct gdsc *sc, bool val)
return 0;
}

-static int gdsc_toggle_logic(struct gdsc *sc, enum gdsc_status status)
+static int gdsc_toggle_logic(struct gdsc *sc, enum gdsc_status status,
+ bool force_sync)
{
int ret;

@@ -149,7 +150,7 @@ static int gdsc_toggle_logic(struct gdsc *sc, enum gdsc_status status)
ret = gdsc_update_collapse_bit(sc, status == GDSC_OFF);

/* If disabling votable gdscs, don't poll on status */
- if ((sc->flags & VOTABLE) && status == GDSC_OFF) {
+ if ((sc->flags & VOTABLE) && status == GDSC_OFF && !force_sync) {
/*
* Add a short delay here to ensure that an enable
* right after it was disabled does not put it in an
@@ -275,7 +276,7 @@ static int gdsc_enable(struct generic_pm_domain *domain)
gdsc_deassert_clamp_io(sc);
}

- ret = gdsc_toggle_logic(sc, GDSC_ON);
+ ret = gdsc_toggle_logic(sc, GDSC_ON, false);
if (ret)
return ret;

@@ -352,7 +353,7 @@ static int gdsc_disable(struct generic_pm_domain *domain)
if (sc->pwrsts == PWRSTS_RET_ON)
return 0;

- ret = gdsc_toggle_logic(sc, GDSC_OFF);
+ ret = gdsc_toggle_logic(sc, GDSC_OFF, domain->synced_poweroff);
if (ret)
return ret;

@@ -392,7 +393,7 @@ static int gdsc_init(struct gdsc *sc)

/* Force gdsc ON if only ON state is supported */
if (sc->pwrsts == PWRSTS_ON) {
- ret = gdsc_toggle_logic(sc, GDSC_ON);
+ ret = gdsc_toggle_logic(sc, GDSC_ON, false);
if (ret)
return ret;
}
--
2.7.4
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