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clk: qcom: gdsc: Handle GDSC regulator supplies 

Certain GDSCs, such as the GPU_GX on MSM8996, requires that the upstream
regulator supply is powered in order to be turned on.

It's not guaranteed that the bootloader will leave these supplies on and
the driver core will attempt to enable any GDSCs before allowing the
individual drivers to probe defer on the PMIC regulator driver not yet
being present.

So the gdsc driver needs to be made aware of supplying regulators and
probe defer on their absence, and it needs to enable and disable the
regulator accordingly.

Voltage adjustments of the supplying regulator are deferred to the
client drivers themselves.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lkml.kernel.org/r/20200417070044.1376212-2-bjorn.andersson@linaro.org
Reviewed-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
This commit is contained in:
Bjorn Andersson 2020-04-17 00:00:41 -07:00 committed by Stephen Boyd
parent f47ab3c2f5
commit 37416e5549
2 changed files with 27 additions and 0 deletions
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23
drivers/clk/qcom/gdsc.c
View File

@ -11,6 +11,7 @@
#include <linux/ktime.h>
#include <linux/pm_domain.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <linux/reset-controller.h>
#include <linux/slab.h>
#include "gdsc.h"
@ -112,6 +113,12 @@ static int gdsc_toggle_logic(struct gdsc *sc, enum gdsc_status status)
int ret;
u32 val = (status == GDSC_ON) ? 0 : SW_COLLAPSE_MASK;
if (status == GDSC_ON && sc->rsupply) {
ret = regulator_enable(sc->rsupply);
if (ret < 0)
return ret;
}
ret = regmap_update_bits(sc->regmap, sc->gdscr, SW_COLLAPSE_MASK, val);
if (ret)
return ret;
@ -143,6 +150,13 @@ static int gdsc_toggle_logic(struct gdsc *sc, enum gdsc_status status)
ret = gdsc_poll_status(sc, status);
WARN(ret, "%s status stuck at 'o%s'", sc->pd.name, status ? "ff" : "n");
if (!ret && status == GDSC_OFF && sc->rsupply) {
ret = regulator_disable(sc->rsupply);
if (ret < 0)
return ret;
}
return ret;
}
@ -371,6 +385,15 @@ int gdsc_register(struct gdsc_desc *desc,
if (!data->domains)
return -ENOMEM;
for (i = 0; i < num; i++) {
if (!scs[i] || !scs[i]->supply)
continue;
scs[i]->rsupply = devm_regulator_get(dev, scs[i]->supply);
if (IS_ERR(scs[i]->rsupply))
return PTR_ERR(scs[i]->rsupply);
}
data->num_domains = num;
for (i = 0; i < num; i++) {
if (!scs[i])

4
drivers/clk/qcom/gdsc.h
View File

@ -10,6 +10,7 @@
#include <linux/pm_domain.h>
struct regmap;
struct regulator;
struct reset_controller_dev;
/**
@ -52,6 +53,9 @@ struct gdsc {
struct reset_controller_dev *rcdev;
unsigned int *resets;
unsigned int reset_count;
const char *supply;
struct regulator *rsupply;
};
struct gdsc_desc {