linux-kernel - [PATCH v2 2/3] clk: qcom: gcc-msm8996: Update the .pwrsts for usb gdsc

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Message-Id: <20230307123159.3797551-2-konrad.dybcio@linaro.org>
Date:   Tue,  7 Mar 2023 13:31:58 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     linux-arm-msm@...r.kernel.org, andersson@...nel.org,
        agross@...nel.org
Cc:     marijn.suijten@...ainline.org,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/3] clk: qcom: gcc-msm8996: Update the .pwrsts for usb gdsc

The USB controller on MSM8996 doesn't retain its 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.

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

This change should be reverted when a proper suspend sequence is
implemented in the USB drivers.

Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
---
v1 -> v2:
- Reword "fix" to "work around", mention it should be temporary
- Add TODO:

 drivers/clk/qcom/gcc-msm8996.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/qcom/gcc-msm8996.c b/drivers/clk/qcom/gcc-msm8996.c
index e16163706735..5e44d1bcca9e 100644
--- a/drivers/clk/qcom/gcc-msm8996.c
+++ b/drivers/clk/qcom/gcc-msm8996.c
@@ -3455,7 +3455,8 @@ static struct gdsc usb30_gdsc = {
 	.pd = {
 		.name = "usb30",
 	},
-	.pwrsts = PWRSTS_OFF_ON,
+	/* TODO: Change to OFF_ON when USB drivers get proper suspend support */
+	.pwrsts = PWRSTS_RET_ON,
 };
 
 static struct gdsc pcie0_gdsc = {
-- 
2.39.2