linux-kernel - [PATCH 6/6] phy: usb: Fix clock imbalance for suspend/resume

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Date:   Wed,  5 Oct 2022 14:30:18 -0700
From:   justinpopo6@...il.com
To:     alcooperx@...il.com, kishon@...com, vkoul@...nel.org,
        f.fainelli@...il.com, linux-kernel@...r.kernel.org,
        linux-phy@...ts.infradead.org
Cc:     bcm-kernel-feedback-list@...adcom.com,
        Justin Chen <justinpopo6@...il.com>
Subject: [PATCH 6/6] phy: usb: Fix clock imbalance for suspend/resume

From: Justin Chen <justinpopo6@...il.com>

We should be disabling clocks when wake from USB is not needed. Since
this wasn't done, we had a clock imbalance since clocks were always
being enabled on resume.

Fixes: ae532b2b7aa5 ("usb: Add "wake on" functionality for newer Synopsis XHCI controllers")
Fixes: b0c0b66c0b43 ("phy: usb: Add support for wake and USB low power mode for 7211 S2/S5")
Signed-off-by: Justin Chen <justinpopo6@...il.com>
---
 drivers/phy/broadcom/phy-brcm-usb-init-synopsys.c | 2 --
 drivers/phy/broadcom/phy-brcm-usb-init.h          | 1 -
 drivers/phy/broadcom/phy-brcm-usb.c               | 8 +++++---
 3 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/phy/broadcom/phy-brcm-usb-init-synopsys.c b/drivers/phy/broadcom/phy-brcm-usb-init-synopsys.c
index f78cff2..76cf428 100644
--- a/drivers/phy/broadcom/phy-brcm-usb-init-synopsys.c
+++ b/drivers/phy/broadcom/phy-brcm-usb-init-synopsys.c
@@ -430,7 +430,6 @@ void brcm_usb_dvr_init_7216(struct brcm_usb_init_params *params)
 
 	params->family_name = "7216";
 	params->ops = &bcm7216_ops;
-	params->suspend_with_clocks = true;
 }
 
 void brcm_usb_dvr_init_7211b0(struct brcm_usb_init_params *params)
@@ -440,5 +439,4 @@ void brcm_usb_dvr_init_7211b0(struct brcm_usb_init_params *params)
 
 	params->family_name = "7211";
 	params->ops = &bcm7211b0_ops;
-	params->suspend_with_clocks = true;
 }
diff --git a/drivers/phy/broadcom/phy-brcm-usb-init.h b/drivers/phy/broadcom/phy-brcm-usb-init.h
index bedf2b8..f9fbf8f 100644
--- a/drivers/phy/broadcom/phy-brcm-usb-init.h
+++ b/drivers/phy/broadcom/phy-brcm-usb-init.h
@@ -62,7 +62,6 @@ struct  brcm_usb_init_params {
 	const struct brcm_usb_init_ops *ops;
 	struct regmap *syscon_piarbctl;
 	bool wake_enabled;
-	bool suspend_with_clocks;
 };
 
 void brcm_usb_dvr_init_4908(struct brcm_usb_init_params *params);
diff --git a/drivers/phy/broadcom/phy-brcm-usb.c b/drivers/phy/broadcom/phy-brcm-usb.c
index d97fa58..aafba4a 100644
--- a/drivers/phy/broadcom/phy-brcm-usb.c
+++ b/drivers/phy/broadcom/phy-brcm-usb.c
@@ -602,7 +602,7 @@ static int brcm_usb_phy_suspend(struct device *dev)
 		 * and newer XHCI->2.0-clks/3.0-clks.
 		 */
 
-		if (!priv->ini.suspend_with_clocks) {
+		if (!priv->ini.wake_enabled) {
 			if (priv->phys[BRCM_USB_PHY_3_0].inited)
 				clk_disable_unprepare(priv->usb_30_clk);
 			if (priv->phys[BRCM_USB_PHY_2_0].inited ||
@@ -619,8 +619,10 @@ static int brcm_usb_phy_resume(struct device *dev)
 {
 	struct brcm_usb_phy_data *priv = dev_get_drvdata(dev);
 
-	clk_prepare_enable(priv->usb_20_clk);
-	clk_prepare_enable(priv->usb_30_clk);
+	if (!priv->ini.wake_enabled) {
+		clk_prepare_enable(priv->usb_20_clk);
+		clk_prepare_enable(priv->usb_30_clk);
+	}
 	brcm_usb_init_ipp(&priv->ini);
 
 	/*
-- 
2.7.4