[PATCH] clk: qcom: gdsc: Ensure regulator init state matches GDSC state

From: Bjorn Andersson
Date: Fri Jun 25 2021 - 18:55:32 EST

As GDSCs are registered and found to be already enabled
gdsc_toggle_logic() will be invoked for votable GDSCs and ensure that
the vote is matching the hardware state. Part of this the related
regulator will be enabled.

But for non-votable GDSCs the regulator and GDSC status will be out of
sync and as the GDSC is later disabled regulator_disable() will face an
unbalanced enable-count, or something might turn off the supply under
the feet of the GDSC.

So ensure that the regulator is enabled even for non-votable GDSCs.

Cc: stable@xxxxxxxxxxxxxxx
Fixes: 37416e554961 ("clk: qcom: gdsc: Handle GDSC regulator supplies")
Signed-off-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
drivers/clk/qcom/gdsc.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/qcom/gdsc.c b/drivers/clk/qcom/gdsc.c
index 51ed640e527b..f7e7759cdb90 100644
--- a/drivers/clk/qcom/gdsc.c
+++ b/drivers/clk/qcom/gdsc.c
@@ -359,10 +359,17 @@ static int gdsc_init(struct gdsc *sc)

* Votable GDSCs can be ON due to Vote from other masters.
- * If a Votable GDSC is ON, make sure we have a Vote.
+ * If a Votable GDSC is ON, make sure we have a Vote. If
+ * non-votable, ensure that the supply is kept enabled (as
+ * is done by gdsc_enable).
- if ((sc->flags & VOTABLE) && on)
+ if ((sc->flags & VOTABLE) && on) {
+ } else if (on) {
+ ret = regulator_enable(sc->rsupply);
+ if (ret < 0)
+ return ret;
+ }

* Make sure the retain bit is set if the GDSC is already on, otherwise