From: Jagadeesh Kona <quic_jkona@xxxxxxxxxxx>
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@xxxxxxxxxxx>
Signed-off-by: Abel Vesa <abel.vesa@xxxxxxxxxx>
---
Changes since v2:
* Renamed gdsc_[set|get]_mode to have the hwmode suffix
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..c763524cd5da 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_hwmode(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_hwmode(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_hwmode;
+ sc->pd.get_hwmode_dev = gdsc_get_hwmode;
+ }
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;
--
2.34.1
