linux-kernel - [PATCH] clk: qcom: gcc-sm6350: Update the .pwrsts for usb gdscs

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Date:   Wed, 28 Sep 2022 15:28:54 +0200
From:   Luca Weiss <luca.weiss@...rphone.com>
To:     linux-arm-msm@...r.kernel.org
Cc:     ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
        Luca Weiss <luca.weiss@...rphone.com>,
        Rajendra Nayak <quic_rjendra@...cinc.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] clk: qcom: gcc-sm6350: Update the .pwrsts for usb gdscs

The USB controllers on sm6350 do not retain the state when
the system goes into low power state and the GDSCs are
turned off.

This can be observed by the USB connection not coming back alive after
putting the device into suspend, essentially breaking USB.

Fix this by updating the .pwrsts for the USB GDSCs so they only
transition to retention state in low power.

Cc: Rajendra Nayak <quic_rjendra@...cinc.com>
Signed-off-by: Luca Weiss <luca.weiss@...rphone.com>
---
Similar to sc7180 & sc7280 patches that have been applied recently:
https://lore.kernel.org/linux-arm-msm/20220927170516.zrkzn3xl7oedzi4l@builder.lan/T/

@Rajendra Nayak: Maybe you know a bit more about the internals of
sm6350&sm7225. As described in the commit message USB just stops working
after suspend, with this it comes back after wakeup from suspend and
continues working. If any details in the commit message are somehow
wrong or I can add something, please let me know!
Thanks for fixing this on sc7180&sc7280!

 drivers/clk/qcom/gcc-sm6350.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/qcom/gcc-sm6350.c b/drivers/clk/qcom/gcc-sm6350.c
index 69412400efa4..9b4e4bb05963 100644
--- a/drivers/clk/qcom/gcc-sm6350.c
+++ b/drivers/clk/qcom/gcc-sm6350.c
@@ -2316,7 +2316,7 @@ static struct gdsc usb30_prim_gdsc = {
 	.pd = {
 		.name = "usb30_prim_gdsc",
 	},
-	.pwrsts = PWRSTS_OFF_ON,
+	.pwrsts = PWRSTS_RET_ON,
 };

 static struct gdsc ufs_phy_gdsc = {
-- 
2.37.3